HP C2021A - Manual

Control Panel Keys . . . . . . . . . . . . . . . . . . . 3-2 Reset Menu . . . . . . . . . . . . . . . . . . . . . . . 3-5Control Panel Menus . . . . . . . . . . . . . . . . . . . 3-6 Printer Features . . . . . . . . . . . . . . . . . . . . . . 3-13 Page Protection (HP LaserJet 4 only) . . . . . . . ...

Printer Drivers . . . . . . . . . . . . . . . . . . . . . . . 3-41 Install Printer Drivers and Utilities . . . . . . . . . 3-41 How to Obtain Printer Drivers . . . . . . . . . . . . . 3-41 DOS Utilities . . . . . . . . . . . . . . . . . . . . . . . . 3-42Packing the Printer . . . . . . . . . . . . ....

Removing the Transfer Roller . . . . . . . . . . . . 4-16Replacing the Transfer Roller . . . . . . . . . . . . 4-16 5 Functional Overview Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 DC Controller System . . . . . . . . . . . . . . . . . . 5-2DC Controller Loads . . . . . . . ....

6 Removal and Replacement Required Tools . . . . . . . . . . . . . . . . . . . . . . . . 6-2Hardware Review . . . . . . . . . . . . . . . . . . . . . . 6-2Removing the Covers . . . . . . . . . . . . . . . . . . . . 6-4 Right Side Cover Removal . . . . . . . . . . . . . . . . 6-4Top Cover Removal . ....

Removing the High Voltage Contact Assembly and Feed Guide Assembly . . . . . . . . . . . . . . . . 6-67 Replacing the High Voltage Contact Assembly/Feed Guide Assembly . . . . . . . . . . 6-68 Interconnect PCA Removal . . . . . . . . . . . . . . . 6-69 7 Troubleshooting LaserJet 5 Error Map . . . . ...

1 Product Information Features HP LJ 4 HP LJ 4M HP LJ 4 Plus HP LJ4M Plus Model C2001A C2021A C2037A C2039A Printer Speed 8 ppm 8 ppm 12 ppm 12 ppm Resolution 300/600 dpi 300/600 dpi 300/600 dpi 300/600 dpi Expandable I/O Buffer No No Yes Yes Resource Savings No No Yes Yes MEt No No Yes Yes REt Yes ...

Product Family Information The model HP C2021A is identical to the model HP C2001A froma hardware standpoint, as is the model HP C2039A to the modelHP C2037A. The models HP C2021A and C2039A printersinclude the following features: • PostScript Level 2 SIMM • AppleTalk MIO Card • 4 MBytes of RAM In e...

Identification The model number is on a label placed on the outside, rear coverof the printer. The model number (C2001A, C2021A, C2037A orC2039A) is found at the top of the label. The model number is thebase number for all printers. The serial number contains information about the printerCountry of ...

Figure 1-2 Printer Identification Label for the HP LaserJet4/4M 1-4 Product Information

Specifications HP LaserJet 4 and 4 Plus Dimension HP LaserJet 4/4M(C2001A/C2021A) HP LaserJet 4 Plus HP LaserJet 4M Plus (C2037A/C2039A) Width 16.4 in (416 mm) 16.4 in (416 mm) Depth 15.9 in (403 mm) 15.9 in (403 mm) Height 11.7 in (297 mm) 11.7 in (297 mm) Weight (with toner cartridge) 37 lbs. (18....

Status 100/115 V 4/4M 4 Plus/4M Plus 220/240 V 4/4M 4 Plus/4M Plus Product Rating 6.4 amps 7.8 amps 3.1 amps 4.0 amps Peak Inrush Current 22 amps 22 amps 22 amps 22 amps 25% Decay Time 13 msec 18 msec 11 msec 11 msec Peak Fuser Current 38 amps 51 amps 17 amps 22 amps Return-to Average Time 200 msec ...

Related Documentation The following manuals can be ordered from Hewlett-Packard’sSupport Materials Organization (SMO). The phone number forSMO is (800) 227-8164. HP LaserJet 4 Documents—Description Part Number Your Guide to Setting Up the HP LaserJet 4Printer C2001-90901 HP LaserJet 4 User’s Manual ...

Safety Information Product and Laser Safety HP printers are UL 1950 listed, CSA 22.2 950 certified, andmanufactured in accordance with DIN IEC 950. The printers arecertified as “Class 1” laser products under the U.S. Department ofHealth and Human Services (DHHS) Radiation PerformanceStandard, accord...

FCC RFI Statement This equipment has been tested and found to comply with thelimits for a Class B digital device, pursuant to Part 15 of the FCCRules. These limits are designed to provide reasonable protectionagainst harmful interference when the equipment is operated in acommercial environment. Thi...

Toner Safety N o t e Toner may stain clothing. Skin and clothing arebest cleaned by removing as much toner aspossible with a dry tissue, then washing with coldwater. Hot water causes toner to melt andpermanently fuse into clothing. A Material Safety Data Sheet (MSDS) for the toner cartridgeused in t...

Doing Business with HP Technical Assistance HP ASAP 1-800-333-1917 (U.S.) HP ASAP (Automated Support Access Program) provides freetechnical support information 24 hours a day, 7 days a week. TheASAP system includes HP FIRST and HP AUDIO-TIPS, bothexplained below. The ASAP service requires a touch-to...

HP AUDIO-TIPS HP AUDIO-TIPS, available within HP ASAP, is an interactivevoice response system providing pre-recorded answers to thequestions most frequently asked by HP LaserJet printer users.Helpful “System Maps” to the HP AUDIO-TIPS recordings areavailable by fax through HP FIRST. HP CompuServe Fo...

European Customer Support Center The HP European Customer Support Center, located inAmsterdam, Holland, is open from 8:30 am to 6:00 pm centralEuropean time (Wednesdays until 4:00 pm). Multilingualcustomer support representatives can answer technical questionssimilar to the U.S. CSC, described on th...

2 Site Planning andRequirements Site Requirements The environmental specifications, listed in the Specifications section of Chapter 1, must be maintained to ensure the properoperation of this printer. Consider the following points beforeinstalling the printer: • Install the printer in a well-ventila...

Printer Space Requirements Figure 2-1 Space Requirements 2-2 Site Planning and Requirements

Print Media Specifications The complete media specifications are listed in the HP LaserJet Family Paper Specifications Guide (part no. 5961-0920), that came with this manual. Each tray has its own set of paper specifications. Do not use paper heavier than 36 pound from the MP tray (Tray 1), 28 pound...

N o t e Printing heavy paper stock (greater than 24 lb.(90 g/m 2 ) from the 500-sheet Lower Cassette specifically is not supported. Media Size Capacity Weight/Thickness Range Paper Letter, A4, Executive 500 sheets at 20# (75 g/m 2 ) 16# to 24# (60 to 90 g/m 2 ) Table 2-3 Media Specifications for Opt...

Adhesive Labels N o t e Printing labels using the Duplex Assembly , the500-sheet Lower Cassette (Tray 3) or the PC tray(Tray 2) specifically is not supported. Always usethe MP tray (Tray 1) to print labels. Label Construction When selecting labels, consider the quality of each component: • Adhesives...

Overhead Transparencies N o t e Printing overhead transparencies using theDuplex Assembly, the 500-sheet Lower Cassette(Tray 3) or PC tray (Tray 2) specifically is notsupported. Overhead transparencies used in HP LaserJet printers must beable to withstand the 392° F (200° C) temperature encountered ...

Envelope Construction The following table lists the kinds of envelopes you can print inthe MP Tray (Tray 1). See the HP LaserJet Family Paper Specifications Guide for more information. Item Specifications Minimum envelope size 3.5 in x 7 in (86 mm x 178 mm) Maximum envelope size 7.4 in x 10.5 in (18...

3 Configuration Introduction The Configuration of the printer consists of setting hard and softuser defaults, and setting up the host computer to communicatewith the printer (System Configuration). For installationinstructions refer to Installation in the Getting Started Manual that is shipped with ...

Using The Control Panel (See Appendix B for LaserJet 5 information.) The control panel (see Figure 3-1) consists of eight keys, threeindicator lights, and a 16-character display panel. The threeindicator lights are described in Table 3-1. Control Panel Keys There are two rows of control panel keys. ...

Indicator Mode Description Ready On: Ready to print. Flashing: Processing a print job. Do not take off line or switchoff. Off: Not ready; see display for message. On Line On: Ready to receive data. Flashing: Going from on line to off line. Off: Off line. Other keys can be accessed. Form Feed On: Dat...

Key Function [On Line] Switches the printer between ON LINE (communicating with the computer or other data source) and OFF LINE (not communicating). For the printer to receive data, both the On Line and Ready indicatorlights must be on. [Form Feed] Prints any data remaining in printer’s buffer. It c...

Reset Menu Use Reset Menu function with caution. It can result in loss ofbuffered page data or printer configuration data. Reset Menu isactivated by holding down both [Shift] and [Menu] for up to 10 seconds until RESET=MENU * appears. Use [+] or [-] to cycle through items and [Enter] to select the i...

Control Panel Menus Figure 3-2 shows the menus and menu items available with thebasic printer configuration. Not all menu items are discussed inthis section. Only those items of specific interest from a servicestandpoint, or items new to the printers are discussed in thissection. If options such as ...

Item Options Explanation COPIES 1* to 999 Select any number from 1 to999. PAPER ENVELOPES LETTER* (110V printers), LEGAL , A4* (220V printers) EXEC COM10 * (110V printers), MONARCH, DL* (220V printers), C5, B5 Sets default image size,unless software settingoverrides it. ORIENTATION P*, L P means por...

Item Options Explanation FONT SOURCE I*CSMn (1-4) Internal fonts*Cartridge fontsPermanent soft fontsSIMM Module: n=slotnumber. Typefaces stored inone of the four ROM SIMMslots (M1=slot 1, forexample). FONT NUMBER 0* to 999 Number assigned to eachtypeface. PITCH or PT. SIZE Pitch: 10.00* Point: 12.00...

Item Options Explanation MP TRAY FIRST* CASS MANUAL Paper is selected first. Operates as a PC tray. Operates as a manual feed tray. LOCK NONE*MPPCLC and combinations No trays are locked out.The MP tray is locked out.The PC tray is locked out.The optional Lower Cassette is lockedout. CLR WARN ON*, JO...

Item Options Explanation IO BUFFER AUTO* OFFON Memory is automatically determinedby the printer.No memory is set aside.Size can be manually adjusted IO SIZE 10K and up With IO BUFER ON , adjust size in increments of 10. RESRCSAVE AUTO* OFFON Saves resources and extra memoryand personality SIMM are i...

Item Options Explanation SERIAL RS-232*RS-422 (HP LJ 4 only) Use the RS-422 when a longer cableis needed. PACING DTR/DSR* XON/XOFF Use if the computer requireshardware flow control.Use if the computer requires softwareflow control. BAUD RATE 9600*300 to 57600 Tells how fast information will betransf...

Printer Features Some of the important features of the HP LaserJet 4, 4 Plus, andLaserJet 5 printers are described below. Page Protection (HP LaserJet 4 only) N o t e The default is PAGE PROTECT=OFF*. Unless you frequently get 21 PRINT OVERRUN messages, you may not need to set a value for page prote...

Resource Saving (HP LaserJet 4 Plus and 5 only) Resource Saving gives the printer the ability to save certainentities such as permanent soft fonts, macros, symbol sets anduser-defined graphics patterns when the printer changespersonalities, resolutions or page protect modes. For example, if auser sw...

EconoMode (HP LaserJet 4 Plus and 5 only) The EconoMode setting uses approximately 50% less toner thanstandard mode printing by reducing dot density. EconoMode,which can also be thought of as “draft mode,” is user selectablevia a front panel key, a Printer Job Language (PJL) sequenceusing HP Explore...

Memory Enhancement technology (MEt)(HP LaserJet 4 Plus and 5 only) HP Memory Enhancement technology (MEt) effectively doublesthe printer’s standard memory through a variety of font and datacompression methods. MEt also automatically compresses fontsfor desktop publishing applications. When printing ...

Network Security The HP LaserJet 4 Plus and 5 printers allow the SystemAdministrator to lock out other user’s ability to change mostprinter control panel settings. This is done by setting a passwordand turning LOCK on. The message MENU LOCKED will appear when a user tries to change the printer contr...

Service Mode (Refer to Appendix B for LaserJet 5 information.) The Service Mode should be used only by authorized servicepersonnel. The following can be executed while in the ServiceMode: • Print a Service Mode Self Test. • Verify the Page Count, (the page count also is displayed on thestandard self...

Setting the Page Count The page count is stored in the printer’s Non-Volatile Memory(NVRAM). If it is necessary to replace the Formatter PCA, thepage count should be reset to the printer’s original page count toreflect the age of the print engine. Use the following procedure toset the page count: 1 ...

Setting the Cold Reset Default The default paper size outside of the U.S. is typically A4.Therefore, when replacing Formatters where the desired defaultis A4, the Customization Variable must be set to A4. Thisprevents the Cold Reset procedure from resetting the paper sizeto Letter. To set the Custom...

Cold Reset The Cold Reset feature of the printers allows the printer to bereturned instantly to the factory default configuration settings.This feature is valuable because the the Dynamic I/O and PJLfeatures of the printer enable any user connected to any I/O toaccess and change the default configur...

Understanding the PCL Self TestPrintout (Refer to Appendix B for LaserJet 5 information.) Item Figure 3-3 Explanation 1 Standard Menu Selections: Shows standard menu selections, such asPrinting Menu and PCL Menu, and menu items, such as Copies and MP tray,in the order they appear in the control pane...

2 1 2 3 4 5 6 7 8 9 11 10 Figure 3-3 HP LaserJet 4/4M PCL Self Test Printout Configuration 3-25

Changing the Control Panel DisplayLanguage The default control panel display language is set for English.Supported languages are: English, French, German, Italian,Spanish, Finnish, Danish, Dutch, Swedish, Norwegian, andPortuguese. Follow these instructions to change the displaylanguage. 1 Switch OFF...

Test Print Button The Test Print button access hole is located on the side of theprinter. Press the Test Print button using a tool similar to apaper clip (see Figure 3-5). The 15 ENGINE TEST only prints from the PC tray (Tray 2). Figure 3-5 Test Print Button Location Configuration 3-29

Pressing the Test Print button will initiate a 15 ENGINE TEST . This is an engine test only. The Format PCA is bypassed whileprinting this test, although a formatter problem can interferewith this test. A page of vertical lines is printed if the printengine is operating correctly (see Figure 3-6). F...

System Configuration MS-DOS System Configuration To communicate properly with the printer, the MS-DOSenvironment requires the addition or modification of MODEcommands in the AUTOEXEC.BAT file. Add or modify theMODE command(s), depending on the interface configuration, asfollows: Parallel DOS Command...

Serial MS-DOS Commands Most IBM compatible computers default to a parallel printer port.To ensure that information is sent to your serial printer port, typethe following MS-DOS commands at your MS-DOS prompt, orinclude them in your AUTOEXEC.BAT file. MODE COM1:9600,N,8,1,P MODE LPT1:=COM1 For MS-DOS...

Printer I/O Configuration Parallel Menu The default setting for the High Speed Parallel I/O is YES. If it isset to NO, the interface runs at a slower speed that is compatiblewith older computers. When the default is set to YES, the parallelinterface runs at a higher rate supported by newer computers...

Serial Cable Pin-outs The following cable diagrams show the cable pinouts for the mostcommon serial configurations. DB-9 RS-232 Serial Connection — HP LaserJet 4 If the computer has a serial port with 9 pins, use the cable orequivalent for the HP LaserJet 4. Figure 3-7 24542G Cable Pinout for 25 to ...

DB-25 RS-232 Serial Connection — HP LaserJet 4 Plus/5 If the computer has a serial port with 9 pins, use the C2932A orequivalent cable for the HP LaserJet 4 Plus. Figure 3-8 C2932A Cable Pinout for 9 to 9 Pin Connector 3-36 Configuration

DB-25 Serial Connection — HP LaserJet 4 If the computer has a serial port with 25 pins, use the 17255Dcable or equivalent for the HP LaserJet 4. Figure 3-9 17255D Cable Pinout for 25 to 25 Pin Connector Configuration 3-37

Modular I/O Configuration The printers are equipped with a modular I/O slot. A modular I/Ointerface card can be plugged into that slot to increase thenumber of interfaces available. A modular I/O card can provide increased printer performancewhen printing from a network. In addition, a modular I/O c...

Printer Drivers Install Printer Drivers and Utilities Printer drivers are specialized programs designed to allowspecific software applications to function with the HP LaserJetprinters. Printer utilities include such things as the HP Explorerprogram modules, which enhance the usability of the printer...

DOS Utilities Use the DOS Utilities to install printer drivers for MS-DOSapplications. Printer driver software for some common softwareapplications are included the DOS Utilities. See the Doing Business With HP section of Chapter 1 for information on software drivers not included with the LaserJet D...

Packing the Printer Repackaging Instructions The printer warranty is for one-year and must be returned to anAuthorized HP service center for service. If the original packagingmaterial is no longer available, replacement packing andshipping material is available from HP’s Support MaterialOrganization...

Installing The Optional LowerCassette N o t e Please see also the Service Notes section forproper use and adjustment of the lower cassette. These printers have an optional 500-sheet Lower Cassette whichis installed in the field. Follow these instructions to install theLower Cassette. 1 Disconnect th...

Loading Paper into the Optional Lower Cassette Figure 3-13 Pull the cassette tray straight out of the printer. Figure 3-14 Adjust the cassette for the paper size you wantto load. Configuration 3-45

Envelope Feeder Installation For complete information about installing the Envelope Feeder,see Envelope Feeder User’s Guide . This guide is provided with the envelope feeder. The instructions below are not intended toreplace the information of the Envelope Feeder User’s Guide . N o t e The LaserJet ...

4 Insert the Envelope Feeder firmly into the printer (see Figure3-22). 5 Turn ON the printer. LaserJet 4 and 4 Plus The envelope size ( EE TRAY= ) appears on the display when the envelope feeder is installed and loaded with envelopes. Theenvelope size can be selected through the Control Panel. Paper...

SIMM Installation SIMM installation is covered in detail in the the printer’s User’s Manual and in the kit that accompanies the SIMM. The instructions shown here are not intended to replace these sources. Follow these instructions to install memory, language, and flashSIMM boards. Install all types ...

Any SIMM board can be installed in any of the four SIMM slots. Because the slots are close together, we recommend installingthem from right to left, starting with slot 1 and ending with slot 4. Figure 3-23 Identifying the Four SIMM Slots 3-52 Configuration

Memory Requirements A page’s complexity (rules, graphics, or dense text) may exceedthe printer’s ability to create the image rapidly enough to keeppace with the printing process. If a page is too complex, only partof the page prints, and some print data loss is likely. In suchcases, a 21 PRINT OVERR...

C a u t i o n When removing a board from the antistaticpackage, avoid touching the metal traces on theSIMM board. For memory boards, compare the part number on the outside ofthe package to the part number in the table below. If you havenot received the correct board, notify your authorizedHewlett-Pa...

Accessing the SIMM Slots Please refer to Chapter 6, Removal and Replacement, forinstructions on removing the SIMMS door to access the slots. Note that access to the SIMM slots are slightly different for thevarious printer models. Installing the SIMM Boards 1 Through the open door, you can see the fo...

3 Hold the SIMM board at a 30-degree angle to the slot andpush the edge of the board evenly and firmly into the slot (seeFigure 3-25 callout (A) ). 4 Rotate the SIMM board to the right until the board “clicks”into the metal locking tabs, securing the board into place (seeFigure 3-25 callout (B) ). 5...

Testing a SIMM Board Use the procedures below to print a self-test page to verify SIMMboard installation. Procedures are given for both memory andPostScript SIMMs. Memory SIMM N o t e For the LaserJet 5/5M/5N, the On Line key has been replaced by the Go key. The Enter key has been replaced by the Se...

Troubleshooting a SIMM Board For more information about the service/error messages below, seeChapter 7, Troubleshooting . Service / Error Messages One of two messages can be generated when your printer ischecking its SIMM internal memory. 61.X SERVICE where X = 1, 2, 3, or 4 This error indicates a S...

Life Expectancy of Consumables Always inspect the components listed in Table 4-1 for wear whenservicing the printer. Replace these components as needed, basedon printer failures or wear, not strictly on usage. DESCRIPTION QTY EST. LIFE (pages) REMARKS 1. Toner Cartridge 1 6800 1 When print becomes f...

Service Checkpoints This is a fold-out page 3 panels wide. Figure 4-1 Maintenance Checkpoints Preventive Maintenance 4-3

Cleaning Your Printer When it is time to replace the toner cartridge, perform thecleaning procedures outlined in Figure 4-1. 4-4 Preventive Maintenance

Toner Cartridge The toner cartridge in your printer contains the printingmechanism and a supply of toner. Your toner cartridge life depends on the amount of toner your jobs require. When you print word-processed text, a toner cartridge lasts approximately 6,800pages, printed at 5% coverage. (A typic...

Saving Toner with EconoMode (HP LaserJet 4Plus and 5 Only) Toner cartridge life can be extended dramatically by using theEconoMode printing feature of the printer. EconoMode can beturned on or off via the printer control panel, through HP’sRemote Control Panel or through a software application with ...

Installing the Toner Cartridge The toner cartridge is empty and must be replaced when thetoner low message cannot be cleared, as described in “Clearingthe 16 TONER LOW Message” later in this section. To replace the toner cartridge: 1 Open the printer’s top cover and remove the empty tonercartridge. ...

3 Remove the sealing tape by firmly grasping the tab on theright side of the toner cartridge and pulling it straight out theside of the cartridge. (See Figure 4-3.) N o t e Pulling the toner cartridge at an angle maydamage the toner cartridge seals. 4 Position the cartridge with the arrow pointing i...

Non-HP Toner Cartridges While Hewlett-Packard does not prohibit the use of Non-HPtoner cartridges during the warranty period or while under amaintenance contract, we do not recommend their use. Thereasons for this are: • Hewlett-Packard has no control or process to ensure that aNon-HP toner cartridg...

Clearing the TONER LOW Message If the 16 TONER LOW message appears in the control panel display, the toner level in the toner cartridge is getting low. The printbecomes lighter and white streaks may appear. (This messagemeans that it is time to replace the toner cartridge). If the control panel Conf...

Periodic Maintenance Procedures Each paper source has a Paper Pickup Roller that should bereplaced when paper no longer feeds reliably. The MP Tray (Tray1) Paper Pickup Roller is shown in Figure 4-5. The PC tray (Tray2) Pickup Roller is shown in Figure 4-7, the LC (Tray 3) PickupRoller is shown in F...

4 Insert a small screwdriver into the indent at the front of theseparation pad and gently lift the pad from its seat (see Figure4-6). 5 Discard the used roller and pad. Figure 4-6 Removing the MP Tray (Tray 1) Separation Pad 4-12 Preventive Maintenance

Removing the PC (Tray 2) Pickup Roller The PC Pickup Roller is underneath the printer (see Figure 4-7).To remove the Pickup Roller: 1 Turn OFF and unplug the power cord from the rear of theprinter. If your interface cable is long enough, it may stayattached, if not, remove it also. 2 Remove the Tone...

Removing the Lower Cassette (LC) or (Tray 3)Pickup Roller If your printer is equipped with the Lower Cassette Assembly,proceed as follows: 1 Remove the Lower Cassette Tray. 2 Press the retainers that hold the roller in place (seeFigure 4-8). 3 Slide the Pickup Roller off the shaft. Figure 4-8 Removi...

Removing and Replacing the Transfer Roller The Transfer Roller is the black sponge-rubber roller locatedinside the printer just to the front of the black plastic Paper FeedGuide (see Figure 4-9). To remove and replace the TransferRoller, follow these steps. N o t e Do not handle the new Transfer Rol...

5 Functional Overview Introduction This section of the manual presents a functional overview of theprinters. It provides the Service Representative with anunderstanding of the printing process. Refer to the block diagramof Figure 5-1 to see the relationship of the parts as a whole. This chapter disc...

DC Controller System The DC Controller PCA is responsible for coordinating allactivities involved in the printing process. The DC Controllerenables the drive circuitry for the laser beam, and coordinatesprint data from the Formatter PCA with paper size, laser beammotion, the high voltage system, fus...

DC Controller Loads Figure 5-1 DC Controller Loads Functional Overview 5-3

Serial Data Communication The printer communicates with and controls the Paper Feeder,the Lower Cassette Assembly, and the Envelope Feeder throughserial data lines SLI and SLO. In addition, the DC Controlleruses information encoded on SLI from the High VoltageTransformer to monitor the toner level. ...

Solenoids Solenoids are controlled by the DC Controller. Each solenoiddrives a specific roller (see Table 5-1). The DC Controller outputs+24B VDC to energize the solenoids at the proper time. Wheneither of the doors are open, the +24B VDC is removed and thesolenoids are disabled. Solenoid Descriptio...

Photosensors Photosensors, monitored by the DC Controller, are responsible fordetecting the presence of paper, paper motion, and timing. (SeeTable 5-2.) Photosensor PS2 senses paper in the PC tray;photosensor PS4 senses paper in the MP tray. The message PC LOAD or MP LOAD is displayed when either th...

Sensor Description PCA PS1 Input/Registration Sensor - detects paper inpickup area Paper Control PCA (J605) PS2 PC tray (Tray 2) Paper-out Sensor - detects thepresence of paper in the PC tray. Paper Control PCA (J605) PS3 Output/Fuser Exit Sensor - detects paper infuser. DC Controller (J208) PS4 MP ...

Microswitches All microswitch conditions are monitored by the DC Controllerover serial data lines SLI and SLO. The State Machines on theindividual control PCAs, (for example the Paper Control PCA)convert the switch condition to a digital logic level, and encodethat information on the data stream for...

PC (Tray 2) and LC (Tray 3) Tray Size SensingSystem Trays inserted into the printer trigger specific microswitches,which define the tray size (see Table 5-4). Refer to Figure 7-1 forlocation. Switch Description PCA SW601 Door Open Sensing Switches (front and rear) Paper Control PCA SW602 Test Print ...

Motors The DC Controller controls the Exhaust Fan, the Main Motor,and the Laser/Scanner Motor. The remaining motors andsolenoids are controlled by State Machines on the motor’sassembly. The condition of these motors and solenoids ismonitored by the DC Controller through serial data lines. The Main M...

Paper Jam Detection The Input/Registration Sensor (PS1) and the Paper Exit Sensor(PS3) detect paper moving through the printer. If a paper jam isdetected, the DC Controller PCA immediately stops the printingprocess and 13 PAPER JAM or REMOVE PAPER JAM message is displayed. A paper jam can be detecte...

Formatter System The formatter is responsible for the following: • Receiving and processing ASCII data from printer interfaces. • Monitoring front panel input and relaying printer statusinformation (through the front panel and bi-directional I/O). • Developing/coordinating data placement and timing ...

Figure 5-5 Formatter PCA—Functional Areas Functional Overview 5-13

Memory Management The printer uses several different types of memory. This memorycan be divided into two different categories, Read Only Memory(ROM) and Random Access Memory (RAM). ROM memoryconsists of the memory located on the Formatter PCA and anyfont cartridges that may be installed in the print...

PJL Overview Printer Job Language (PJL) is an integral part of configuration,in addition to the standard Printer Command Language. Withstandard I/O cabling, PJL allows the printer to perform functionssuch as: • Allowing the printer to talk to the host computer through aBi-directional parallel connec...

Image Formation System Laser printing requires the interaction of several differenttechnologies (such as electronics, optics, andelectro-photographics) to provide a printed page. Each processfunctions independently and must be coordinated with all otherprinter processes. The image formation process ...

Photosensitive Drum The photosensitive drum is the “heart” of the Image FormationSystem. The special properties of this drum allow an image to beformed on the drum’s surface and then transferred to paper. Thedrum is an extruded aluminum cylinder. The outside of thecylinder is coated with a layer of ...

Cleaning Stage During the cleaning stage of the image formation process, thedrum’s surface is physically cleaned, preparing it to hold animage. During printing, the drum is rotating constantly makingseveral complete rotations per printed page. Before forming theimage for a given section of print, a ...

Conditioning Stage After the drum is physically cleaned, it must be conditioned. Thisprocess consists of applying a uniform negative charge on thesurface of the drum with the primary charging roller, located inthe toner cartridge. The primary charging roller is coated withconductive rubber with an A...

Writing Stage At the writing station, the laser beam is used to discharge thedrum’s negative potential by focusing laser light onto areas of thephotosensitive drum. This creates a latent electrostatic image,which later is developed into a visible image. Laser light is produced by a small modulated l...

At the beginning of each sweep (before the beam reaches thedrum), the beam is reflected off the beam detect mirror. Themomentary pulse of light is sent to the DC Controller, where it isconverted to an electrical signal used to synchronize the output ofdata (VDO) for one sweep (scan line). This pulse...

Developing Stage The developing station develops the latent electrostatic imageinto a visible image on the drum. The developing unit consists ofa metallic cylinder that rotates around a fixed magnetic coreinside the toner cavity. Toner is a powdery substance made ofblack plastic resin bound to iron ...

The DC bias of the developing cylinder is adjusted to change theforce of attraction between the toner and drum by changing theprint density setting from the control panel. A change in DC biascauses either more or less toner to be attracted to the drum,which in turn either increases or decreases the ...

Transferring Stage At the transferring station, the toner image on the drum’s surfaceis transferred to the paper. A positive charge applied to the backof the paper by the transfer roller causes the negatively chargedtoner on the drum’s surface to be attracted to the page. The small radius of the dru...

Fusing Stage At the fusing station, the toner is fused into the paper by heatand pressure to produce a permanent image. The paper passesbetween a heated fusing roller and a soft pressure roller. Thismelts the toner and presses it into the paper. To keep the toner orpaper from sticking, the upper fus...

Paper Feed System N o t e The LJ 5 printer designators differ as follows. LJ 4 / 4 Plus Multipurpose (MP) Tray Paper Cassette (PC) Tray Lower Cassette (LC) Tray LJ 5 Tray 1 Tray 2 Tray 3 The following paper paths are described in this section of themanual: • PC Tray (Tray 2) to Output Trays • MP Tra...

The Paper Feed Assembly performs horizontal registration of theprint media through the Oblique Rollers. As the print mediapasses through the Oblique Rollers, the media is moveduniformly to the left side of the print path. The movementensures that each print image is oriented properly on thehorizonta...

Figure 5-17 Paper Feed Assembly (Sectional View) Part Description PS1 Leading Edge Registration Sensor PS2 PC Tray (Tray 2) Paper Out Sensor PS3 Exit Sensor PS4 MP Tray (Tray 1) Paper Out Sensor PS5 MP Tray (Tray 1) Paper End Sensor SL1 Cassette (Tray 2) Pickup Roller Clutch Solenoid SL2 MP (Tray 1)...

Printing from the MP Tray (Tray 1) MP tray selection is provided by the Formatter PCA, asconfigured by the operator’s control panel or by a softwareapplication. The MP tray (Tray 1) feed system’s paper motionbegins when the DC Controller PCA, after receiving a PRNTsignal, starts the Scanner Motor (M...

Printing from the PC Tray (Tray 2) PC tray selection is provided by the Formatter PCA, asconfigured by the control panel or by software. When the DCController PCA receives a PRNT signal, it starts the ScannerMotor (M5) and the Main Motor (M1). When the fusing rollerreaches the minimum operating temp...

Power System When the main power switch is turned ON, the AC Power Supplyprovides AC voltage to the DC Power Supply and the fuserassembly heat lamp. The paper path doors must be closed toactivate the AC power supply door switches before voltage isprovided to the heat lamp. The DC Power Supply genera...

Figure 5-20 Power System Block Diagram 5-32 Functional Overview

Basic Sequence of Operation The Formatter PCA and the DC Controller PCA shareinformation during printer operation. Connector J7 on theformatter and connector J207 on the DC controller form a linkwhich operates as a serial data bus. This allows printer status,command information, and dot-image data t...

6 Each time the formatter receives a synchronized BD signalfrom the DC controller, the formatter sends a VIDEO datastream (VDO) to the DC controller. 7 After the DC controller receives the VDO data, the DCcontroller translates it into a VIDEO OUT signal (VDOUT)that switches the laser diode ON and OF...

This a 2 panel pull-out. Figure 5-21 MP Tray Timing Diagram—HP LaserJet 4/4M Functional Overview 5-35

This a 2 panel pull-out. Figure 5-22 MP (Tray 1) Timing Diagram—HP LaserJet 4Plus/4M Plus/5/5M/5N 5-36 Functional Overview

Warmup Period The Warmup period begins when the printer’s power is turnedON, and ends when the fusing roller temperature reaches 172° C.When the printer is switched ON, the exhaust fan (FM1) beginslow-speed rotation and the fusing roller maintains 172° C. TheDC controller then switches the main moto...

Initial Rotation Period When the DC controller receives a PRINT signal (PRNT) from theformatter, the DC controller allows the fusing roller to beginwarming up to approximately 183° C, and starts the main motor(M1), the pickup motor (M2), and scanner motor (M5). Next, thelaser diode turns ON and gene...

Print Period When the leading edge of the paper activates theinput/registration sensor (PS1), the DC controller forces the laserdiode ON until a BD signal is received. Next, the DC controllerreceives a VIDEO data stream (VDO) from the formatter. TheDC controller translates the VDO data into a VIDEO ...

Last Rotation Period After printing is complete, the Last Rotation period begins,during which residual static charges are eliminated from thephotosensitive drum to prepare for the next printed page. About 1.7 seconds after the Last Rotation period begins, anominal standby voltage is applied to the t...

6 Removal and Replacement This chapter describes the complete disassembly of the printerfrom the beginning. In every instance, tasks that must beperformed before beginning the procedure are listed first.Remove the assemblies in the order listed to prevent damageduring re-assembly. Removal and replac...

Required Tools Hardware Review All screws used in the printer are Phillips head, which require aPhillips screwdriver. Figure 6-1 shows the difference between aPhillips and a Pozidriv screwdriver. Note that the Phillips tip hasmore beveled surfaces. C a u t i o n Use of a Pozidriv screwdriver will da...

Table 6-2 describes the screws used in the printers, and providesguidelines to help determine where each type of screw is used.The screws can vary in length depending on the thickness of thematerial being fastened. Typically, plated screws are used in areas visible to the customer,and black screws a...

Removing the Covers Right Side Cover Removal LJ 4/4 Plus 1 Open the Top Cover and release the Right Side Cover bypressing at the points shown in Figure 6-2. 2 Fold the cover away from the printer to release the bottomsupports and lift the door off of the printer frame. LJ 5 1 Open the Top Cover and ...

Top Cover Removal 1 Open the Top Cover. 2 Remove the Right Side Cover. 3 Open the Rear Door. 4 Remove the (3) screws shown in Figure 6-3, callout 1 . 5 Release the (2) latch points with a flat screwdriver whilelifting the Top Cover (see callout 2 .) 6 Carefully lift the top cover to access the Contr...

7 Disconnect the Control Panel Ribbon Cable and remove thetop cover (see Figure 6-4). Figure 6-4 Control Panel Cable 6-6 Removal and Replacement

Left Side Cover Removal 1 Remove the Right Side Cover and the Top Cover. 2 Release the 2 latch points on the Left Side Cover (front latchfirst) see Figure 6-5. The latches are on the inside of the LeftSide Cover. 3 Fold out the cover and remove. N o t e When removing the LJ 5 left side cover, you mu...

Rear Door Removal 1 Remove the PC tray (Tray 2). 2 Open the Rear Door. Support the door with one hand. 3 Release the door support from the rear of the printer frame asfollows: (see Figure 6-6) a Using needle-nose pliers, squeeze the tabs on the end of theretaining strap. Slide the strap up and out o...

4 LaserJet 4/5: Flex the Rear Door to release it from its hinges. Press the middle of the door while lifting either side (Figure 6-7a). LaserJet 4 Plus: Remove the Rear Door Attaching Clip (Figure 6-7b, callouts 1 through 3 ). Slide the Rear Door as far as possible toward the left, then rotate to re...

Font Door Cover Removal (LJ 5 Right FrontCover Removal) LJ 4/4 Plus 1 Remove the Right Side Cover, the Top Cover,and the PC Tray. 2 Release the top latch (see Figure 6-8, callout 1 ). 3 Release the (2) lower latches through the access hole in themetal cover (see Figure 6-8, callout 2 and Figure 6-9,...

Figure 6-9 Font Door Cover Latches Removal and Replacement 6-11

Multi-Purpose (MP) Tray (Tray 1) Door Removal 1 Remove the PC Tray. 2 Open the MP Tray door and extend the MP Tray. 3 Bend the Door Slides out to release the tray from the doorslides (see Figure 6-10). Place the inner door in the “up”position. LJ 4/4 Plus 4 Flex the MP tray at the lower middle and r...

Multi-Purpose (MP) Tray (Tray 1) Removal 1 Remove the Right Side Cover, Top Cover, Left Side Cover, MPTray Door (Tray 1), and the Font Door Cover. 2 Remove the PC Tray (Tray 2). 3 Remove the (2) screws in the Cross-member Bracket as shownin Figure 6-11, callout 1 . Remove the Cross-member Bracket. (...

4 On the LJ 4+ and LJ 5 you must release the tray tensionspring located at the left side of the tray. Use a pair ofneedlenose pliers to remove the spring from the tray. 5 Rotate the tray down until it slides off its slotted hinges (about120°)(see Figure 6-12). Figure 6-12 Rotate the Tray Down to Rel...

Assemblies Removal Power Supply Removal 1 Remove the Right Side Cover. 2 Remove the (3) or (2) screws from the metal cover at the lowerright corner of the printer (see Figure 6-13a or b, callout 1 .) Remove the metal cover. N o t e Note which end of the connecting rod is installedinto the Power Supp...

4 Remove the (2) screws from the bottom frame (see Figure 6-14,callout 1 ). 5 Slide the power supply out the right side of the printer toaccess the power supply connectors. (continued on next page) Figure 6-13b Remove the Sheet Metal Plate (LaserJet 4 Plus/5) Figure 6-14 Power Supply Screws 6-16 Rem...

6 Remove the (2) connectors (6 wire and 3 wire). (See Figure6-15, callout 1 .) Squeeze the release tab on the 6-wire connector. Pull the 3-wire connector straight up. 7 Remove the power supply. N o t e When replacing the power supply, be sure to usethe screws with the star washers to ensure propergr...

Paper Feed Assembly Removal 1 Remove the Right Side Cover, the MP opening cover, (seeFigure 6-17), the Top Cover and the Left Side Cover, the FontDoor Cover, and the PC tray (Tray 2). The MP tray need notbe removed, but is shown removed for clarity. 2 Remove the MP Tray (Tray 1) door, the Front Cros...

(continued on next page) Figure 6-17 MP Tray Opening Cover Removal and Replacement 6-19

5 Remove the (3) screws from the left side of the printer (seeFigure 6-18, callout 1 ). 6 Remove the Paper Feed Assembly by lifting it and sliding itout the front of the printer. N o t e Replace the screws in order as shown. (1-2-3 isalso scribed on the printer chassis.) Tighteningthese screws in th...

High Voltage Power Supply (HVPS) Removal 1 Remove the Toner Cartridge and PC tray. 2 Lay the printer on its left side. (Place a cloth under the printerto prevent marking the cover.) 3 Remove the (2) screws that hold the HVPS in place (seeFigure 6-19, callout 1 ). 4 Release the (2) latches that hold ...

Fuser Assembly Removal C a u t i o n The Fuser Assembly may be hot . Allow plenty of time for the fuser to cool before beginning thefuser removal procedure. 1 Open the rear door. 2 Remove the (2) screws that hold the Fuser to the printerframe (see Figure 6-20, callout 1 ). 3 Slightly lift the Fuser ...

Control Panel and Overlay Removal 1 Remove the Right Side Cover and the Top Cover. 2 Turn the Top Cover over and place it on flat surface. 3 Release the (3) latches that contain the Control Panel (seeFigure 6-21, callout 1 ). 4 Carefully pivot the Control Panel away from the Top Cover. (continued on...

5 If you must replace the Control Panel Overlay, release the (2)retaining tabs from the Control Panel and separate theoverlay from the Control Panel (see Figure 6-22, callout 1). 6 Squeeze the sides of the Control Panel Overlay to release the(2) tabs (see Figure 6-22, callout 1 ). 7 Tilt the Overlay...

Removing the SIMMs Door 1 Remove the Right Side Cover. LaserJet 4: 2 Remove the (2) screws that hold the SIMMs cover (seeFigure 6-23a, callout 1 ). 3 Open the SIMMs cover, lift the door slightly to remove thedoor from the hinge. (continued on next page) Figure 6-23a Removing the SIMMs Door (LaserJet...

Formatter Cage Removal N o t e You may wisht to remove the metal cover (on thelower right side) and the power supply for easieraccess to the Formatter Cage screws. 1 Remove the Right Side Cover and the Top Cover. 2 LaserJet 4 and 5: Remove the (7) screws (6 screws in the LJ 5) shown in Figure 6-24a....

Figure 6-24b Formatter Cage Screws (Right Side View -LaserJet 4 Plus) Figure 6-24c Formatter Cage Screws (Rear View - LaserJet 4Plus) 6-28 Removal and Replacement

Formatter PCA Removal C a u t i o n The Formatter PCA is very sensitive to Electro-static Discharge (ESD) damage. Observe properESD procedures when servicing the printer. N o t e Before removing the old Formatter PCA, print a 05 SELF TEST to check the current printer page count, if possible. If a se...

LaserJet 4 Formatter PCA: 1 Remove any MIO or SIMM modules from the FormatterAssembly. 2 Remove the (2) black screws from the side of the FormatterCage (see Figure 6-25a, callout 1 ). 3 Remove the MIO Connector Support Bracket (see Figure6-25a, callout 2 ). 4 Remove the (2) Formatter PCA mounting sc...

5 Remove the (4) Interface Connector Support Screws from therear of the Formatter Cover. The RS-232 connector is heldwith 5mm hex-head cap screws (see Figure 6-25b, callout 1 ). The parallel connector (see Figure 6-25b, callout 2 .) is held in place with Phillips screws. 6 Remove the Formatter PCA. ...

LaserJet 4 Plus and 5 Formatter PCA 1 Remove any MIO or SIMM modules from the FormatterAssembly. 2 Remove the MIO Connector Support Bracket (seeFigure 6-25a, callout 2 ). 3 Remove the (4) I/O screws (see Figure 6-26 callout 1 ). 4 Remove the (2) Formatter PCA mounting screws (seeFigure 6-26 callout ...

DC Controller Removal N o t e Note the cable routing before beginning thisdisassembly procedure. Be careful not to damagethe cables during re-assembly. 1 Remove the Right Side and the Top Cover Assemblies. 2 Remove the Formatter Cage Assembly. 3 Remove the 6-wire connector from the Power Supply. 4 R...

Figure 1-27b DC Controller Connectors/Retaining Clips(LaserJet 4 Plus/5) 6-34 Removal and Replacement

DC Controller Installation C a u t i o n When reinstalling the DC Controller PCA it isextremely important that all cables be properly routed. If cables are not routed properly, it is difficult to reinstall the Formatter Cage and cabledamage may result. When replacing the DC Controller, be sure to se...

Figure 1-28 Leading Edge Registration AdjustmentDimensions Figure 1-29 VR202 Settings (LaserJet 4 shown) 6-36 Removal and Replacement

Main Motor Assembly Removal 1 Remove the Right Side Cover, Top Cover, and the FormatterCage Assembly. 2 Unplug the Main Motor connector from the Main MotorAssembly (see Figure 6-30, callout 1 ). 3 Remove the (4) Main Motor screws (see Figure 6-30, callout 2 ). 4 Remove the Main Motor. Figure 1-30 Ma...

Gear Assembly Removal 1 Remove the Top Cover, the Right Side Cover, the FuserAssembly, and the Formatter Assembly. 2 Remove the Main Motor Assembly (see Figure 6-30). 3 Remove the (2) screws that hold the Gear Assembly (seeFigure 6-31 callout 1 ). 4 Slide the Gear Assembly from the rear of the print...

Fan Removal N o t e Note the cable routing before beginning thisdisassembly procedure. Be careful not to damagethe cables during re-assembly. 1 Remove the Right Side Cover, the Top Cover, and theFormatter Cage Assembly. 2 Unplug the fan connector (J209 on the LaserJet 4, J211 on theLaserJet 4+/5). (...

3 Remove the RFI shield (LJ 4 only) by releasing the retainingtab and sliding the shield up (see Figure 6-33, callout 1) . 4 Laser Jet 4: Release the (4) clips from the fan ducting to provide clearance and remove the fan from the top of theprinter (see Figure 6-33, callout 2 ). Laser Jet 4 Plus/5: R...

Output Assembly Removal 1 Remove the Right Side Cover, the Top Cover, and the LeftSide Cover. 2 Release the grounding strap from the left side of the frame. 3 Rotate the top of the Output Assembly toward the front of theprinter while releasing the two retaining latches (see Figure6-34, callout 1) un...

Paper Exit Sensor (PS3) Removal 1 Remove the Right Cover, Top Cover, and the Output Assembly. 2 Disconnect the Sensor Cable. 3 Lift the Sensor Retaining Latch and slide the sensor forward(see Figure 6-35). 4 Remove the Paper Exit Sensor. Figure 1-35 Exit Sensor 6-42 Removal and Replacement

Scanner Assembly Removal 1 Remove the Right Side Cover, Top Cover, Left Side Cover, andthe Output Assembly. 2 Remove all cables from the Scanner retaining clips. 3 Remove the (3) connectors (see Figure 6-36, callout 2 ). N o t e Be careful not to flex the Laser PCA whenremoving or installing the cab...

Lower Cassette Assemblies The field-replaceable assemblies of the Lower Cassette are: • Lower Cassette Sensor PCA Assembly • Lower Cassette Pickup Motor Assembly Lower Cassette Sensor PCA Removal 1 Release the Sensor PCA cover latches (see Figure 6-37callout 1 ). 2 Cut the tie-wrap and remove the (3...

Lower Cassette Pickup Motor Removal 1 Open the sensor cover and disconnect the center and rearconnectors (see Figure 6-37, callout 2 ). 2 Release the (2) tabs that hold the Upper Front Cover (accessthe tabs through the slots with a small screwdriver - seeFigure 6-38 callout 1 ). Remove the cover by ...

5 Lift the motor assembly straight up out of the the LowerCassette Base (see Figure 6-39). N o t e Note the ground connector underneath the MotorAssembly. Be careful not to damage thisconnector during reassembly. Figure 1-39 Lower Cassette Motor 6-46 Removal and Replacement

Replacing Fuser Assembly Parts The following procedures describe the removal and replacementof major Fuser Assembly Components (Fusing Roller, Thermistor,Thermoswitch, and Heater Lamp). When performing theseprocedures, note the order in which the parts were removed andtheir orientation. C a u t i o ...

Fuser Assembly Configuration Figure 6-40 provides an overview of the orientation of the majorFuser Assembly components. Before beginning the fuserdisassembly procedures, become familiar with the location andorientation of the various Fuser Assembly parts (see Table 6-1). Figure 1-40 Fuser Assembly C...

Removing the Fuser Roller Heat Lamp 1 Laser Jet 4 only : Remove the (2) latches that hold the right side cover. (There is a gear exposed on the right side of thefuser, see Figure 6-41, callout 1 .) 2 Release the (7) latches on the LaserJet 4 or the (5) latches onthe LaserJet 4 Plus that hold the wir...

3 LaserJet 4 : With a screwdriver, release the latches by first pressing to clear the lower latch, then lifting to release theupper latch (see Figure 6-42a). LaserJet 4 Plus : With a screwdriver, release the latches by first pressing to clear the lower latch, then lifting to releasethe upper latch. ...

(continued on next page) Figure 1-42b Fuser Cover End Latches (LaserJet 4 Plus) Figure 1-42c Fuser Wire Harness Cover Removal (LaserJet 4Plus) 6-51 Removal and Replacement

5 Remove the (1) Heat Lamp lead (thermoswitch screw)(seeFigure 6-43 callout 1 ). 6 Press the thermoswitch tab towards the paper exit flag torelease the tab (see Figure 6-43 callout 2 ). Slide the Thermoswitch off the fuser frame (see Figure 6-43, callout 3 ). 7 LaserJet 4 : Remove the cable retainer...

N o t e LaserJet 4 and 5 only: Note the orientation of the bushing on the left side of the Fusing Roller. 8 Squeeze the lamp connector to release the slip-on connectorlocking tab from the right side of the heat lamp (see Figure6-44, callout 1 ). (continued on next page) Figure 1-44 Gear Side Heat La...

N o t e Before removing the gear cover, note the routingof the wires in the gear cover slots. 9 Remove the (2) screws from the right side gear cover (seeFigure 6-45, callouts 1 and 2 ). Note the wavy washer on the (1) screw (callout 1 ) touching the copper contact. Remove the cover. 10 Remove the He...

Fuser Assembly Thermoswitch Removal N o t e Six of the seven latches are accessed from the topof the wire cover. These latches are beneath thefelt pad. The slot on the front left side of the wireharness cover is the best place to begin removingthe cover. 1 Remove the Wire Harness Cover as shown in F...

Thermistor Removal 1 Remove the Wire Harness Cover as shown in Figure 6-47. 2 Remove the (2) screws from the thermoswitch connector (seeFigure 6-47, callout 1 ). 3 Release the thermoswitch latch from the paper sensor flagside of the Fuser Assembly (behind the side cover, see Figure6-47, callout 2 )....

5 Release the (2) springs from the Upper Fusing Frame (seeFigure 6-48a, callout 1 ). 6 Release the tabs that hold the Upper Fusing Frame to theFuser Body (see Figure 6-48a). Rotate the Upper Framebackwards to release and access the Thermistor (see Figure6-48b, callout 1 ). (continued on next page) F...

7 Remove the (1) screw that holds the Thermistor (see Figure6-48b, callout 2 ). N o t e Ensure the thermistor cable is routed correctlywhen assembling the fuser (see Figure 6-47). Figure 1-48b Upper Fuser Frame Removal (LaserJet 4 Plus) 6-58 Removal and Replacement

Paper Control PCA Removal 1 Remove the Right Side, Top, Left Side, and Font Door Covers,then Paper Feed Assembly. 2 Disconnect the cables from the sensors (see Figure 6-49,callout 1 ). 3 Remove the (2) self-tapping screws from the Paper ControlPCA (see Figure 6-49, callout 2 ). 4 Release the (5) lat...

Sensor PCA Removal 1 Remove the Right, Left, Top, and Font Door covers. You neednot remove the MP Tray. 2 Perform the Paper Control PCA removal procedure, as shownin the preceding section. 3 Disconnect the connectors for SL1, SL2, and M2 from the leftend of the Sensor PCA. 4 Release the (3) clips th...

PS1 and PS2 Sensor Assembly Removal The PS1 and PS2 sensors are located under the Paper FeedAssembly. 1 Remove the Paper Feed Assembly and place it on a flatsurface, with the MP Tray side down. N o t e You need not remove the MP Tray from the PaperFeed Assembly. Use a cloth to protect the MPTray doo...

After removing the Fuser Assembly, remove the contact platefrom the rear of the printer, as follows: 1 Remove the (1) screw from the sheet metal Guide Plate Cover.(This screw is behind the Fuser Assembly, see Figure 6-52,callout 1 ). 2 Remove the Guide Plate Cover by freeing the front edge,lifting u...

3 Remove the (6) rollers from the High Voltage ContactPlate (see Figure 6-53 callout 1 ). (continued on next page) Figure 6-53 Paper Guide Rollers 6-64 Removal and Replacement

4 From the front of the printer, remove the (2) black self-tappingscrews that hold the Inner Cross-member. Remove thecross-member (see Figure 6-54 callout 1 ). (continued on next page) Figure 6-54 Cross Member Screws 6-65 Removal and Replacement

5 From the left side of the printer, remove the (1) or (2) black,self-tapping screw(s) that holds the Left Toner CartridgeGuide Plate (see Figure 6-55, callout 1 ). 6 Release the guide plate latch (see Figure 6-55, callout 2 ). 7 Remove the Laser Shutter Pivot Pin from its seat in the LeftToner Cart...

Removing the High Voltage Contact Assemblyand Feed Guide Assembly N o t e The following procedures are difficult and thecomponents are damaged easily. The tolerancesbetween the parts are close and several attemptsmay be necessary before the procedure iscomplete. 1 Perform all the steps of “Accessing...

Replacing the High Voltage ContactAssembly/Feed Guide Assembly The Toner Cartridge Guide Plate and the High Voltage ContactAssembly/Feed Guide Assembly must be installed together.Allow plenty of time to perform this procedure because severaliterations of the process may be necessary. 1 Set the conta...

Interconnect PCA Removal The Interconnect PCA is a connector board that connects thePower Supply and the DC Controller with the the FuserAssembly. The Fuser Assembly connects directly into theInterconnect PCA. The Power Supply and the DC Controller havewiring harnesses that connect them to the Inter...

N o t e Access the Interconnect PCA Housing by layingthe printer on the rear of the printer chassis. 4 Disconnect the Interconnect Cable connector from the DCController (J210 on LJ4, J213 on LJ4+/5). Remove the cablefrom its retainer. 5 Release the bottom or rear-most latch (see Figure 6-59),callout...

N o t e The AC Connector has polarity. Note theorientation of the AC Connector before removingit. This is required in order to install the connector with the same polarity during assembly(see Figure 6-60). 7 Release the AC Connector from the sheet metal withneedle-nose pliers. Service Hint: Use a 5m...

7 LaserJet 5 Error Map The LaserJet 5/5M/5N printer has error messages that aresimilar to the LaserJet 4/4M/4+/4M+. Use the following table tolook up the LJ5 error and take the recommended action. If therecommendation is to see another error, for example See 00 POWERSAVE , look up the recommendation...

Message on LJ 5/5M/5N Recommendations INCOMPATIBLE TRAY 3 INSTALLED Indicates that a lower cassette has beeninstalled that is not compatible with theLJ5. Press GO to clear the error. The tray will not appear in any control panelor PJL messages. INITIALIZING (powerup only) See 05 SELF TEST INSTALL TO...

Message on LJ 5/5M/5N Recommendations REMOVE PAPER JAM See 13 PAPER JAM REQUESTED LANGUAGE NOT AVAILABLE See W2 INVALID PERS RESETTING ACTIVE I/O See 07 RESET RESETTING ALL I/O See 07 RESET RESTORING FACTORY SETTINGS See 08 COLD RESET TONER LOW See 16 TONER LOW TRAY 2/3 EMPTY Indicates Tray 2 or 3 h...

7 Troubleshooting Pre-Troubleshooting Procedures Preliminary Operating Checks Prior to troubleshooting a specific printer problem, you shouldensure that: • The printer is being maintained on a regular basis asdescribed in Chapter 4. • The customer is using acceptable media as specified in theUser’s ...

Printer Message Troubleshooting Printer Message Summary Table Table 7-1 is a list of all status, attendance, error, and servicemessages affecting the printers. The table also identifies theaction required to correct the situation identified by the message.When the action requires removal and replace...

Clearable Warnings A clearable warning indicates a transient condition in theprinter. The printer continues on line while the message isdisplayed in place of 00 READY . A clearable warning appears each time the printer alters resolution or page protection (this causesreconfiguration of memory), or a...

Message Displayed Meaning W1 IMAGE ADAPT MEMORY LOW, PAGESIMPLIFIED The printer received a graphics print file that was toocomplex to print at the requested resolution. The printerautomatically processed the file in the highest resolutionpossible with the memory installed. Add additional memoryto pr...

Printer Message TroubleshootingProcedures When the following procedures require removing and replacingan assembly or PCA, refer to the applicable section in Chapter 6for instructions. Blank Display Checks Action Is the power on? 1. 2. Check the ON/OFF switch and verify the power isplugged in. Press ...

Cassette Size Switches (SW603, SW604, SW605) FunctionalCheck Before beginning this test, remove the Lower Cassette Base andthe Envelope Feeder. Also, PS2 (PC or Tray 2 Paper Out sensor)must be engaged for this test to be performed reliably. Push PS2up towards the rear of the printer with your hand. ...

Paper Size Sensing Lower Cassette The operator must set the appropriate paper size for the LowerCassette using a dial which, in turn, activates switches on thecassette base. This setting is sent to the DC Controller on theserial data bus (SLI). The printer posts a 41.3 SERVICE error if the media is ...

12 Printer Open Message The 12 PRINTER OPEN (or CLOSE PRINTER COVER ) display tells the operator to close the printer’s top cover. The DC Controllerdetects the Printer Open condition through the position ofSW601, which is located on the Paper Feed Assembly PCA . A tabunderneath the top cover Door en...

SW601 Functional Check 1 Open the Top Cover Assembly. 2 The message 12 PRINTER OPEN (or CLOSE PRINTER COVER ) should appear. 3 Close the top cover. The 02 WARMING UP message should appear. 4 If the messages do not occur, check the switch actuator (seeFigure 7-2, callout 1) on the top cover, and chec...

13 PAPER JAM Message Paper jams occur when paper fails to arrive at or clear the paperpath sensors in the allotted time. Paper movement is monitoredprimarily by two paper sensors. These are described below andillustrated in Figure 7-3). 1 PS1, the Input/Registration Sensor, located in the Paper Feed...

Jam Location Checks and Action Required Input Area Jams(Sensed by PS1.) 1. Check that the Transfer Roller is fully seated and shows nosign of wear. 2. Check that the Toner Cartridge is fully seated. 3. Check that the cassettes are not overfull and the media isloaded correctly. 4. Ensure that the med...

PS1 (Input/Registration Sensor) Check 1 Power ON the printer with the top cover open . Wait for the 12 PRINTER OPEN (or CLOSE PRINTER COVER ) message. 2 Engage PS1 by taping it down. a For the LaserJet 5, install the toner cartridge. 3 Close the top cover. The 02 WARMING UP message should display. 4...

Lower Cassette Functional Check When troubleshooting a Lower Cassette failure, always prove thefailure by removing the Lower Cassette from the printer. Next,test the printer’s ability to move and print media satisfactorilywithout the Lower Cassette installed. The Lower Cassette is a field-serviceabl...

14 NO EP CART Message The printer detects the presence of the Toner Cartridge and thelevel of toner present in the cartridge through the condition of theANTIN signal. The ANTIN signal becomes part of the serial datastream used to communicate with the DC Controller (see Figure7-5 for cartridge compon...

1 2 4 5 6 3 Figure 7-5 Toner Cartridge Components Callout Assembly 1 Toner Low Voltage Contact 2 Developer Roller High Voltage Contact 3 Developer Roller 4 Photoconductive Drum 5 Charge Roller High Voltage Contact 6 Charge Roller Table 7-8 Toner Cartridge Components 7-26 Troubleshooting

50 SERVICE Error - Fuser Malfunction W a r n i n g The Fuser Assembly is HOT. Allow the assemblytime to cool before servicing. The purpose of the fusing system is to maintain a constanttemperature on the fuser roller. A high intensity fusing lamp,located inside the fuser roller, provides the high te...

N o t e The 50 SERVICE error message can be cleared immediately by shorting the C202 leads on theHP LaserJet 4/4M (or the C205 leads on the HPLaserJet 4 Plus/4M Plus/5/5M/5N) on the DCController. Remove the Formatter PCA to accessthe DC Controller as shown in Chapter 6. Checks Action Is the Fuser As...

51 ERROR Message The 51 ERROR , and the 41.2 ERROR are caused by Beam Detect failures. If the beam detect signal is lost for more than 2 secondsthe error is posted as a 51 ERROR . The 41.2 ERROR can be cleared by pressing [Continue] (or Go ). The 51 ERROR may be cleared by power cycling the printer....

52 ERROR Scanner Malfunction The scanner motor is a flat, brushless, DC motor. Motor operationis completely controlled by the DC Controller. The scanner motor is enabled when the printer is powered-up(during the printer’s power-on self test), or whenever the PRINTcommand is received by the Formatter...

57 (or 57.1) SERVICE Message (Main MotorFailure) The 57 SERVICE indicates that the DC Controller PCA detected a general motor failure. The Main Motor drives all movingcomponents in the printing process. The Main Motor is a 4-phase,DC servo motor controlled by the DC Controller PCA. The formatter det...

Image Defect Summary The quality of the printer’s output is subject to the judgment ofthe user. This section of the manual helps you define printquality defects, and understand what factors affect print quality. The print samples shown in the following figures illustrate someprint quality defects. K...

Possible Cause Action The HVPS connections are dirty. Clean the HVPS terminals (see Figure7-18 for layout). The HVPS is installed improperly. If theHVPS has been removed and replaced,it may not be seated properly. Remove the HVPS, and check theconnectors for damage. Reseat theHVPS, being certain to ...

Possible Cause Action Paper. The surface of the paper may betoo smooth for the pickup roller to movethe paper through the paper path. Change paper. Try a brand of paperknown to be good. Worn Pickup Roller and Separation Pad. If the Paper Pickup Roller, or theSeparation Pad are sufficiently worn, the...

Possible Cause Action No toner available for print. Shake/replace the EP Toner Cartridge. Laser shutter may be blocking the beam Ensure that the mechanism that lifts theshutter is functional, for example, theshutter doesn’t stick in its travel, and islifted evenly. Table 7-15 Right-Hand Image Missin...

For further information on interval dimensions, refer to theRepetitive Defect Ruler, Figure 7-19. Possible Cause Action Toner Cartridge. The circumference ofthe photoconductive drum is 3.75 inches(94mm). The circumference of thedeveloper roller is 2 inches (51mm). If adefect appears in the print ima...

Possible Cause Action Fuser levers not in place.(All LJ4, some LJ4+, N/A on LJ5) The Fuser Assembly has shipping leversthat must be lowered during the setupprocess. See Chapter 3 for instruction onhow to lower the fusing levers. Media. The media may not be acceptablefor laser printing. Heavy paper s...

Possible Cause Action Laser/Scanning Assembly or DCController PCA. Replace the Laser/Scanning Assemblyfollowed by the DC Controller PCA, ifnecessary (see Figure 7-12 for locations). Table 7-22 Black Pages with Horizontal White Strips Possible Cause Action Input/Registration Sensor (PS1). ThePaper Pi...

PS5 Check (MP Tray Paper End Sensor) Functional Test 1 Make a test sheet by cutting a notch in the trailing edge of asheet of paper as shown in Figure 7-9. 2 Perform the set up procedures listed for the PS4 check (MPTray Empty Sensor) on page 7-17, and put the test sheet intothe MP tray when the dis...

Possible Cause Action Dirty Primary Charge roller. Change the Toner Cartridge. Bad Toner Cartridge. Replace the Toner Cartridge. Incompatible media. During mediamanufacture, inks, or other finishingprocesses may interfere with theelectro-photographic or fusing process. Change type of media. Table 7-...

Possible Cause Action Defective Toner Cartridge. The TonerCartridge may be internally damaged. Replace the Toner Cartridge. Bad paper lot. The paper moisturecontent, conductivity, or surface finishmay be incompatible with theelectro-photographic process. Try a different paper lot (see the HPLaserJet...

Possible Cause Action Defective laser shutter. Check the laser shutter for free operationwhen inserting the EP Toner Cartridge. EP Cartridge Support damaged,improperly positioned, or missing. Refer to item 4 in Figure 8-4a. Guidemust be installed properly above the EPCartridge, between the laser shu...

Image Formation Troubleshooting Half Self-Test Functional Check The electro-photographic process can be subdivided into thefollowing stages: • Cleaning (Physical and Electrostatic). • Conditioning (Primary Charge Roller). • Writing (Laser Modulation). • Development (Formation of the Toner Image). • ...

Drum Rotation Functional Check The photoconductive drum, located in the Toner Cartridge, mustrotate for the print process to work. The photoconductive drumreceives its drive from the Main Motor gear train. To verifywhether the drum is rotating: 1 Open the printer’s Top Cover Assembly. 2 Remove the T...

High Voltage Power Supply Assembly The High Voltage Power Supply Assembly provides the necessaryvoltages for the printer’s electro-photographic processes. The+24B VDC supply is used to power the High Voltage PowerSupply Assembly. A summary of the major components of thehigh voltage system, is given ...

Interface Troubleshooting This section provides an overview of the printer interfacerequirements. Refer to Chapter 3 for detailed information aboutthe printer interfaces and configuration. Communications Check N o t e Communication problems are normally thecustomer’s responsibility. Time spent attem...

AUTOEXEC.BAT Standard Configurations Parallel DOS Commands If the previous check did not produce the desired result, ensurethat the AUTOEXEC.BAT file contains the following statementsfor parallel interface communications: MODE LPT1:,,P For MS-DOS version 4.0 and above, enter: MODE LPT1:,,B N o t e T...

Communications Checks Checks Action Is your computer configured to theparameters described in theconfiguration instructions? These parameters are required tocommunicate with the printer. Verify yourcomputer’s communications portconfiguration matches these parameters. Note: If these parameters are no...

MIO Troubleshooting The Self Test Printout and explanation shown on the followingpages contain valuable information regarding the current statusof the MIO. Before attempting to troubleshoot a network problemor notifying your network consultant of a problem, always obtaina Self Test Printout. Trouble...

Explanation of Self Test Printout 1 Multiple Environment Information. General informationabout your JetDirect MIO. 2 JetDirect Card Status. I/O CARD READY indicates theinterface is correctly configured and capable ofcommunicating. I/O CARD NOT READY indicates there is aproblem with the interface, co...

Figure 7-10 MIO Staus Information on the Self Test Printout 7-58 Troubleshooting

Troubleshooting Aids Component Locations The following illustrations help you quickly find the partsdiscussed in this chapter. 1 2 3 4 5 5B 5A 5C Figure 7-11 Major Assembly and Connector Locations Number Part Number Part 1 Fuser Assembly 5 Paper Feed Assembly 2 Cooling Fan 5A Paper Control PCA 3 DC ...

1 2 3 4 Figure 7-13 Major Assembly and Connector Locations (3 of 3) Number Part 1 Power Supply Assembly 2 Envelope Feeder Main Motor (M4) 3 Lower Cassette Drive PCA 4 Lower Cassette Main Motor (M3) Table 7-33 Troubleshooting 7-61

Figure 7-14 Switch Locations Number Part SW101 AC Input ON/OFF Switch (Power Supply Assembly) SW 601 Top Cover Open Sensing Switch SW602 TEST PRINT Switch SW603 PC (Tray 2) Tray Size Switches SW604 SW605 Table 7-34 7-62 Troubleshooting

TB403 TB404 TB405 TB406 VR401 J402 3 1 J401 5 1 AB AB TB402 TB401 Figure 7-18 High Voltage PCA Layout Number Part J401 High Voltage PS Connection To DC Controller PCA viaInterconnect PCA TB401 Transfer Roller Contact TB402 Drum Ground Contact TB403 Toner Low/EP Toner Cartridge-in-Place Contact TB404...

Repetitive Defect Template Repetitive print defects usually are associated with a specificroller within the printer, or the Toner Cartridge. The followingtemplates are provided to help quickly isolate the cause ofrepetitive print defects. Align the first occurrence of the defectwith the top of the “...

Voltage Test Points The operating voltages of the printer can be verified by: 1 Listening for the exhaust fan. A rotating fan indicates that the+5 VDC and +24A VDC voltages are present. (The fan runs on+24A VDC. The +5 VDC enables the +24A VDC.) 2 Listen for the Main Motor. If the Main Motor runs, t...

8 Parts and Diagrams How To Use the Parts Lists The figures in this chapter illustrate the major subassembliesand component parts of the HP LaserJet 4/4M, LaserJet 4 Plus/4M Plus, and LaserJet 5/5M/5N printers. When ordering anelectrical part, pay special attention that the part chosen has thecorrec...

Parts Lists and Illustrations Figure 8-1a Field-Replaceable Assemblies (1 of 2) 8-2 Parts and Diagrams

Figure 8-1b Field-Replaceable Assemblies ( 2 of 2) Parts and Diagrams 8-3

Part # Ref Exchng # Description Fig. # RG5-0454-000CNRG5-0879-130CN 1 C2001-69003C2037-69001 Fusing Ass’y (100/110V)LaserJet 4 LaserJet 4 Plus/5 8-10 RG5-0455-000CNRG5-0880-130CN 1 C2001-69004C2037-69002 Fusing Ass’y (220/240V)LaserJet 4LaserJet 4 Plus/5 8-10 RH7-1151-000CNRH7-1169-000CN 2 Main Moto...

Part # Ref Exchng # Description Fig. # C2085BC2085EC3925A 13 PC Tray (Tray 2) (ltr)LaserJet 4LaserJet 4 PlusLaserJet 5 8-14 C2085CC2085FC3926A 13 PC Tray (Tray 2) (A4)LaserJet 4LaserJet 4 PlusLaserJet 5 8-14 RG5-0531-000CNRG6-2499-000CN 14 C2001-69007C2037-69006 Power Supply (100/120V)LaserJet 4Lase...

Figure 8-2 Covers and Panels 8-6 Parts and Diagrams

Figure 8-3a Top Cover Assembly for LaserJet 4/4+ 8-8 Parts and Diagrams

Ref Part # Notes Description 1 RB1-2330-000CN S Spring, Leaf 3 RG5-0458-000CNRG5-0872-000CN LJ4 LJ4+ Upper Cover Assembly 3A RB1-2322-000CNRB1-3474-000CN LJ4 LJ4+ Top Cover Door 3B RB1-2323-000CN Hinge, Bracket 3C RB1-2324-000CN 2 ea. Hinge, Pin 3D RB1-2329-000CNRB1-3473-000CN LJ4 LJ4+ Hinge, Arm 3E...

Ref Part # Notes Description 4A C2037-40001C2037-40002C2037-40003C2037-40004C2037-40005C2037-40006C2037-40007C2037-40008C2037-40009C2037-40010C2037-40011C2037-40012C2037-40013C2037-40014 LJ4+ EnglishFrenchGermanItalianSpanishNorwegianSwedishDanishFinnishDutchPolishTurkishPortugeseEuropean English 5 ...

Figure 8-3b Top Cover Assembly for LaserJet 5 Parts and Diagrams 8-11

Figure 8-4a Internal Components (1 of 4) Ref Part # Notes Description 1 RB1-2080-000CN Shutter, laser 2 RB1-2100-000CNRB1-5730-000CN LJ4/4+ LJ5 Guide, Cartridge 3 RB1-2101-020CN Guide, Cartridge 4 RB1-2105-030CN Support, Cartridge 5 RB1-2106-000CN S Plate, grounding 6 RB1-2107-000CNRB1-7913-000CN LJ...

7 RB1-2111-030CN Shutter, arm 8 RB1-2114-000CN Qty 5 Foot 9 RS5-2218-000CN Spring, Compression 10 RB1-2122-000CN Shutter Spring, Torsion 11 RB1-5732 -000CN Spring, Torsion 12 RB1-2141-000CNRB1-7888-000CN LJ4/4+ LJ5 Cover, Inner 13 RB1-2353-000CNRF5-1648-000CN LJ4/4+ LJ5 Holding Plate 13A RB1-7901-00...

Figure 8-4b Internal Components (2 of 4) Parts and Diagrams 8-15

Ref Part # Notes Description 1 RB1-2112-000CNRB1-3544-000CN LJ4 LJ4+/5 Exhaust Duct 2 RB1-2113-000CNRF5-0748-000CN LJ4 LJ4+/5 Exhaust Duct Cover 3 RB1-2350-000CNRB1-3547-000CN LJ4 LJ4+/5 Exhaust Fan Cover 4 RB1-2352-000CNRB1-7896-000CN LJ4/4+ LJ5 Rod 5 RF5-0470-000CNRF5-0743-000CNRF5-1653-000CN LJ4 ...

Figure 8-4c Internal Components (3 of 4) Parts and Diagrams 8-17

Ref Part # Notes Description 1 RS5-8219-000CN S Label 2 RB1-2357-000-CNRB1-7897-000CN LJ4/4+ LJ5 Cover, Connector 4 XA9-0584-000CNXA9-0670-000CN LJ4 LJ4+/5 Screw, w/ spring washer 5 XA9-0574-000CN Screw, 5mm hex head 6 RF5-0471-000CNRF5-0746-000CNRF5-1647-000CN LJ4 LJ4+ LJ5 Plate, Shield 7 RF5-0355-...

Ref Part # Notes Description 22 C2002-67901C2038-60004C3919-67901 LJ4 LJ4+ LJ5 Formatter PCA 22 C2002-69001C2038-69004C3919-69001 LJ4 LJ4+ LJ5 Formatter PCA (Exchange) 23 RB1-3494-000CNRB1-7892-000CN LJ4+ LJ5 Plate, Reinforcement Parts and Diagrams 8-19

Figure 8-4d Internal Components (4 of 4) 8-20 Parts and Diagrams

Ref Part # Notes Description 1 RB1-2236-000CN Guide, Feeder 2 RB1-2253-000CN Roller, Guides (6) 3 XA9-0623-000CN Hex Head Screw 4 RG5-0468-000CNRG5-2192-000CN LJ4/4+ LJ5 Transfer Block Ass’y 5 RB1-2251-000CN Block, Connecting 6 RG5-0521-000CNRG5-0979-000CN LJ4 LJ4+/5 Cable, D.C. Controller /Intercon...

Figure 8-5 Main Switch Assembly 8-22 Parts and Diagrams

Figure 8-6a Paper Feed Assembly (1 of 2) 8-24 Parts and Diagrams

Figure 8-6b Paper Feed Assembly (2 of 2) Parts and Diagrams 8-25

Ref Part # Notes Description RG5-0451-000CNRG5-0877-000CNRG5-2195-000CN LJ4 LJ4+ LJ5 Paper Feed Assembly C2001-69005C2037-69003C3916-69005 LJ4 LJ4+ LJ5 Paper Feed Ass’y (exchng) 1 RB1-2126-000CNRB1-3477-000CNRB1-7911-000CN LJ4 LJ4+ LJ5 Roller, Pickup, PC Tray Roller, Pickup, Tray 2 2 RB1-2127-000CNR...

Figure 8-7 MP Tray (Tray 1) Assembly Part # Notes Description RG5-0472-000CNRG5-0888-000CNRG5-2199-000CN LJ4 LJ4+ LJ5 Multi-Purpose Tray Assembly Tray 1 Assembly Table 8-7 MP Tray (Tray 1) Assembly Parts and Diagrams 8-27

Figure 8-8 Paper Output Assembly Ref Part # Notes Description RG5-0456-000CNRG5-0886-000CNRG5-2189-000CN LJ4 LJ4+ LJ5 Paper Output Assembly 2 RB1-2299-030CN 4 ea. Rollers, Delivery 3 RB1-2302-000CN 4 ea. Spring, Roller 7 RF5-0425-040CN 4 ea. Holder, Roller 13 RS5-2185-000CNRS5-2267-000CN LJ4 LJ4+/5 ...

Figure 8-9 Delivery Sensor Assembly Ref Part # Notes Description RG5-0475-060CN Assembly, Delivery Sensor 5 WG8-0291-000CN Photosensor, (PS3) 6 RG5-0522-000CNRG5-0980-000CN LJ4 LJ4+/5 Cable, Delivery Sensor Table 8-9 Delivery Sensor Assembly Parts and Diagrams 8-29

Ref Part # Notes Description 20 RS5-0232-000CNRS5-0393-000CN LJ4 LJ4+/5 S Gear, 23T 21 RS5-1063-000CNRS5-1097-020CN LJ4 LJ4+/5 Bushing, Roller 22 RS5-1064-000CNRS5-1098-000CN LJ4 LJ4+/5 S Bushing, Roller 23 RS5-1065-000CNRS5-1099-000CN LJ4 LJ4+/5 S Bushing, Lower Roller (2) 24 RS5-2168-000CNRS5-2265...

Accessory Parts Figure 8-11 Lower Cassette Base Assembly Parts and Diagrams 8-33

Figure 8-12 Lower Cassette Drive Assembly Ref Part # Notes Description 1 RG5-0481-000CNRG5-1099-000CNRG5-2209-000CN LJ4 LJ4+ LJ5 Drive Assembly, Lower Cassette Drive Assembly, Tray 3 1a RB1-2627-020CN Weight 1b RB1-2632-000CNRB1-2650-000CNRB1-7983-000CN LJ4 LJ4+ LJ5 Roller, Pickup Table 8-12 Lower C...

Figure 8-13 Lower Cassette Assembly Ref Part # Notes Description 1 C2084AC2084C LJ4 LJ4\4+ Universal 500 sheet Lower CassetteTray (non-Legal) 1 C2084BC2084DC3923A LJ4 LJ4/4+ LJ5 Universal 500 sheet Lower CassetteTray (Legal) 16 RB1-2645-000CNRB1-8009-000CN LJ4/4+ LJ5 Cover, Rear Cassette 21 RF5-0446...

Figure 8-14 Universal Cassette Parts and Diagrams 8-37

SIMM Memory Ref Part # Notes Description C2085AC2085DC3924A LJ4 LJ4+ LJ5 250 sheet Universal Tray (Legal, Letter, Exec,A4) C2085BC2085EC3925A LJ4 LJ4+ LJ5 250 sheet PC Tray (letter) C2085CC2085FC3926A LJ4 LJ4+ LJ5 250 sheet PC Tray (A4) 2 RB1-2370-020CN Plate, Length Adjustment (part of tray assy) 2...

Miscellaneous Parts and Accessories Part # Notes Description 92298A Toner Cartridge J2341AJ2552A (J2552-69001) LJ4 LJ4+/5 AppleTalk MIO Interface J2550A (J2550-69001) LJ5 10-BaseT MIO Interface C2082BC3927A LJ4/4+ LJ5 Envelope Feeder (new) C2082-69001C3927-69001 LJ4/4+ LJ5 Envelope Feeder (exchange)...

Parts List Description Part # Fig. # Printer 10-BaseT MIO Interface J2550A (J2550-69001) 5 16 Mbytes C3146A 4+/5 250 Sheet PC Tray (A4) C2085C 8-14 4 250 Sheet PC Tray (A4) C2085F 8-14 4+ 250 Sheet PC Tray (A4) C3926A 8-14 5 250 Sheet PC Tray (letter) C2085B 8-14 4 250 Sheet PC Tray (letter) C2085E ...

Description Part # Fig. # Printer Base, Switch Mounting RB1-2118-000CN 8-5 4/4+ Base, Switch Mounting RB1-7906-000CN 8-5 5 Belt, Timing XF9-0410-000CN 8-8 4/4+/5 Block, Connecting RB1-2251-000CN 8-4d 4/4+/5 Brush, cleaning RB1-2260-000CN 8-3a 4/4+ Bushing, Lower Roller (2) RS5-1065-000CN 8-10 4 Bush...

Description Part # Fig. # Printer Cable, Paper Feed RG1-0542-020CN 8-11 4/4+/5 Clamp, Plate Release RB1-2284-000CN 8-10 4/4+ Click, Spring RF5-0374-000CN 8-11 4/4+/5 Click, Tray 1 Door (Qty 2) RB1-7902-000CN 8-4a 5 Connector PCA Assembly RG5-0515-000CN 8-4d 4/4+/5 Cover RB1-2270-000CN 8-10 4 Cover R...

Description Part # Fig. # Printer Cover, Upper RF5-0732-000CN 8-3a 4+ Cover, Upper RF5-1643-000CN 8-3b 5 Cover, Wire RF5-0535-000CN 8-10 4 Cover, Wire RF5-0738-000CN 8-10 4+/5 DC Controller PCA C2001-69002 8-1b 4 DC Controller PCA C2001-69002 8-4b 4 DC Controller PCA C2037-69004 8-1b 4+/5 DC Control...

Description Part # Fig. # Printer Envelope Feeded (exchange) C2082-69001 4/4+ Envelope Feeded (exchange) C3927-69001 5 Envelope Feeder (new) C2082B 4/4+ Envelope Feeder (new) C3827A 5 Exhaust Duct RB1-2112-000CN 8-4b 4 Exhaust Duct RB1-3544-000CN 8-4b 4+/5 Exhaust Duct Cover RB1-2113-000CN 8-4b 4 Ex...

Description Part # Fig. # Printer Fuser Assembly (100/115V) C2037-69001 4+/5 Fuser Assembly (220/240V) C2001-69004 4 Fuser Assembly (220/240V) C2037-69002 4+/5 Fuser Assembly (220/240V) RG5-0455-000CN 4 Fuser Assembly (220/240V) RG5-0880-130CN 4+/5 Fusing Assembly (100/110V) C2001-69003 8-10 4 Fusin...

Description Part # Fig. # Printer Guide, Lower Separation RB1-2272-000CN 8-10 4 Guide, Lower Separation RB1-3526-000CN 8-10 4+/5 Guide, Paper Entrance RB1-2265-000CN 8-10 4 Guide, Paper Entrance RB1-3518-000CN 8-10 4+/5 Guide, Separation RF5-0536-000CN 8-10 4 Guide, Separation RF5-0744-000CN 8-10 4+...

Description Part # Fig. # Printer Inner Cover Assembly RB1-2609-000CN 8-11 4+ Inner Cover Assembly RB1-7978-000CN 5 Inner Cover Assembly RG5-0487-000CN 8-11 4 Label RS5-8219-000CN 8-4c 4/4+/5 Label 110/115V RS5-8205-000CN 8-2 4/4+/5 Label 220/240V RS5-8916-000CN 8-2 4/4+/5 Laser/Scanner Assembly C20...

Description Part # Fig. # Printer Lower Cassette Tray, Univ. 500 sheet C2084A 8-13 4 Lower Cassette Tray, Univ. 500 sheet C2084C 8-13 4+/5 Lower Cassette Tray, Univ. 500 sheetLegal C2084B 8-13 4 Lower Cassette Tray, Univ. 500 sheetLegal C2084D 8-13 4+/5 Lower Cassette Tray, Univ. 500 sheetLegal C392...

Description Part # Fig. # Printer Overlay (Czechoslovakian) C3916-40023 8-3b 5 Overlay (Danish) C2001-40008 8-3a 4 Overlay (Danish) C3916-40011 8-3b 5 Overlay (Dutch) C2001-40010 8-3a 4 Overlay (Dutch) C3916-40013 8-3b 5 Overlay (English) C2001-40001 8-3a 4 Overlay (English) C3916-40005 8-3b 5 Overl...

Description Part # Fig. # Printer Overlay (Spanish) C3916-40009 8-3b 5 Overlay (Swedish) C2001-40007 8-3a 4 Overlay (Swedish) C3916-40016 8-3b 5 Overlay (Thai) C3916-40025 8-3b 5 Overlay (Traditional Chinese) C3916-40017 8-3b 5 Overlay (Turkish) C2001-40012 8-3a 4 Overlay (Turkish) C3916-40020 8-3b ...

Description Part # Fig. # Printer Paper Feed Assembly RG5-0451-000CN, 4 Paper Feed Assembly RG5-0451-000CN 8-6 4 Paper Feed Assembly RG5-0877-000CN 8-6 4+ Paper Feed Assembly RG5-0877-000CN 4+ Paper Feed Assembly RG5-2195-000CN 8-6 5 Paper Feed Assembly RG5-2195-000CN 5 Paper Output Assembly RG5-045...

Description Part # Fig. # Printer Plate, Grounding RB1-2647-000CN 8-11 4/4+/5 Plate, Length Adjustment RB1-2370-020CN 8-14 4/4+/5 Plate, PCA Holding RB1-2365-000CN 8-4c 4 Plate, PCA Holding RB1-3493-000CN 8-4c 4+/5 Plate, Pressure RB1-7917-000CN 8-4a 5 Plate, Pressure RB1-7918-000CN 8-4a 5 Plate, Pr...

Description Part # Fig. # Printer Power Supply (100/110V) RG5-0531-000CN 8-1a 4+/5 Power Supply (100/110V) RG5-0531-000CN 8-1a 4 Power Supply (100/110V) RG5-2499-000CN 8-1a 4+ Power Supply (100/110V) RG6-2499-000CN 8-1a 4+/5 Power Supply (220/240V) C2001-69008 8-1a 4 Power Supply (220/240V) C2037-69...

Description Part # Fig. # Printer Roller, Lower RB1-3517-030CN 8-10 4+/5 Roller, Lower Delivery RF5-0438-000CN 8-8 4 Roller, Lower Delivery RF5-1077-030CN 8-8 4+/5 Roller, MP Tray Pickup RB1-2127-000CN 8-6b 4/4+ Roller, MP Tray Pickup RB1-2205-000CN 8-6b 5 Roller, Pickup RB1-2126-000CN 8-6b 4 Roller...

Description Part # Fig. # Printer Screw, w/Spring Washer XA9-0584-000CN 8-4c 4 Screw, w/Spring Washer XA9-0670-000CN 8-4c 4+/5 Screw, w/Washer, 2 ea XA9-0267-000CN 8-4b 4+/5 Screw, w/Washer, 4 ea. FA9-1449-000CN 8-4b 4 Sensor PCA RG5-0514-000CN 8-6b 4/4+/5 Shaft RF5-0375-000CN 8-11 4/4+/5 Sheet RB1-...

Description Part # Fig. # Printer Support, Cartridge RB1-2105-030CN 8-4a 4/4+/5 Switch RB1-2119-000CN 8-5 4/4+ Switch RB1-7907-000CN 8-5 5 Thermistor RH7-7045-000CN 8-10 4 Thermistor RH7-7054-000CN 8-10 4/4+ Thermoswitch Assembly RG5-0474-000CN 8-10 4 Thermoswitch Assembly RG5-0881-000CN 8-10 4+/5 T...

A Duplexer This Appendix contains a functional overview of the OptionalDuplexer, as well as step-by-step Installation and Removal &Replacement instructions. The Optional Duplexer, when used with the LaserJet 4 Plus/5printer, allows printing on both sides of the paper. It may be usedwith the opti...

Functional Overview The Duplexer consists of two major assemblies; the SwitchbackAssembly that is attached to the back of the printer and theHolding Tray located directly under the printer (see Figure A-1.) SWITCHBACKASSEMBLY OUTPUT TRAY MP TRAY PC TRAY DUPLEXER OPTIONAL500-SHEETCASSETTE HOLDING TRA...

Duplex Printing N o t e The bold text and numbers in the following description refer to parts shown in Figure A-2. When the printer is operating in duplex mode, the print imagesare printed in reverse order. Page two prints on the first pass ofthe paper through the printer and page one prints on the ...

As the paper moves from the Switchback Assembly, it is pickedup by the rollers that are operated by the Holding Tray InputStepper Motor. The Input Stepper Motor moves the paper intothe Holding Tray. When the paper moves the flag that controlsthe Holding Tray Paper Sensor, the Duplex Control PCA turn...

Electrical Overview The block diagram in Figure A-3 shows the Duplexer electricalcomponents. AC POWERSUPPLY DUPLEXERCONTROLPCA AC POWERTO PRINTER INPUTAC POWER TO PRINTERDC CONTROLLER FAN SWITCHBACKSOLENOID SWITCHBACKSTEPPER MOTOR HOLDING TRAYSTEPPER MOTOR SWITCHBACKPAPER SENSOR HOLDING TRAYPAPER SE...

Installing the Optional Duplexer The optional Duplexer can be installed by the customer. Thereare no fasteners securing the units together. The printer simplyrests in place on top of the Duplexer, which, in turn, rests on topof the optional 500-sheet Lower Cassette, if used. To install the Duplexer,...

7 6 5 2 4 3 1 2 3 1 2 1 1 2 Figure A-4 Duplexer Installation/Removal Duplexer A -7

Removal and Replacement This section describes the complete disassembly of the Duplexer.Tasks that must be performed before beginning the procedure arelisted first. Remove the assemblies in the order listed to preventdamage. The assembly procedure is the reverse of the removal procedure,except where...

Removing the Covers Removing the Switchback Covers 1 Remove the (2) screws shown in Figure A-5, callout 1. 2 Lift the cover off the Switchback Assembly. Figure A-5 Switchback Cover Duplexer A -9

Figure A-8 Latch Location on Underside of Duplexer A -12 Duplexer

Removing the Back Cover 1 Place the duplexer on a table or bench so that the backoverhangs the edge by a few inches. 2 Release the (2) locating pins as shown in Figure A-9. 3 Rotate the cover downward until it is free. Removing the Front Cover With the side covers removed, the front cover is only at...

Removing Internal Duplexer Components Removing the Fan/Motor/Solenoid/Sensor Access to the electronic components of the switchback assembly iseasy once the covers are removed. Note the location of theswitchback stepper motor (Figure A-10, callout 1), the switchbackfan assembly (callout 2) and the sw...

Removing the Switchback Paper Guide 1 Remove the (1) E-clip from the shaft on the stepper motor sideshown in Figure A-11, callout 1. 2 Pull the shaft toward the left and out of its track. 3 Rotate the shaft 90 degrees to remove it from the metal paperguide solenoid arm. Figure A-11 Switchback Paper ...

Removing the Paper Guide Assembly 1 Remove the (4) screws shown in Figure A-11, callout 2. 2 Lift the switchback assembly and clear the wires. 3 Remove the assembly. N o t e : When re-assembling, verify proper wire routingas shown in Figure A-12, callout 1. Figure A-12 Wire Routing and Upper Switchb...

3 Remove the (1) screw shown previously in Figure A-12,callout 2 . Remove the upper switchback paper guide by releasing its latch with a flat screwdriver and pushing to theside. 4 Remove the (4) screws on top of the sheet metal part of theupper paper guide shown in Figure A-14, callout 1 . (continue...

5 Remove the (1) E-clip from the gears on the shaft on thePower PCA side shown in Figure A-15, callout 1 . 6 Rotate the bushings and lift the roller out. Figure A-15 Gears on Paper Roller Duplexer A -19

Removing the Control PCA 1 Remove the (2) screws shown in Figure A-16, callout 1 . 2 Remove the cover plate. (continued on next page) Figure A-16 Cover Plate A -20 Duplexer

3 Unplug all connectors from the Control PCA. N o t e The Control PCA connectors are keyed. 4 Remove the (4) screws shown in Figure A-17. 5 Disconnect the connector from the power supply. 6 Remove the PCA. Figure A-17 Control PCA Duplexer A -21

Removing the Power PCA 1 Remove the (6) cover screws, (4) on the top and (2) on the side.Remove the cover. 2 Remove the (4) screws from the Power PCA (see Figure A-18,callout 1 ). 3 Unplug the connector (see Figure A-18, callout 2 ). 4 Lift the Power PCA out of the duplexer. Figure A-18 Power PCA A ...

Removing the Holding Tray Center Paper Guide 1 Remove the Control PCA as described earlier. 2 Remove the (2) screws from the plate located on the powerPCA side of the duplexer (see Figure A-19, callout 1 ). 3 Lift off the guide. Figure A-19 Plate on Power PCA Side of Duplexer Duplexer A -23

Removing the Holding Tray Belt 1 Remove all the screws securing the plate (see Figure A-20,callout 1). 2 Remove (1) E-clip shown in Figure A-20, callout 2 . 3 Remove the bushing underneath the E-clip. 4 Release (2) latch points shown in Figure A-20, callout 3 . N o t e : The (2) washers on the gear ...

6 Remove the (1) one-way gear shown in Figure A-21, callout 1 . N o t e The one-way gear must be reassembled correctly.With the gear on the shaft, turn the gearclockwise. The shaft should move the belt.Turning the gear counter clockwise should resultin no movement of the shaft and belt. 7 Remove the...

Removing the Holding Tray Paper Sensor 1 Release the output holding tray. 2 Remove the (2) screws from the stepper motor mount andremove mount. (This provides access to the paper sensorlatches.) 3 Squeeze the (2) latch points of the paper sensor to release (seeFigure A-22). 4 Disconnect the connecto...

Removing the Switchback Assembly 1 Pull out the pin located on the Power PCA side (see FigureA-23, callout 1 ). 2 Release the (1) E-clip on the upper pin near the retaining arm(see Figure A-23, callout 2 ). 3 Pull the retaining arm off the pin. 4 Rotate the switchback assembly and remove. 5 Unplug t...

Parts and Diagrams for the Duplexer The figures in this section illustrate the major subassemblies andcomponent parts of the HP LaserJet 4+/5 Duplexer. N o t e Not all duplexer parts are orderable. The parts listed are the onlyorderable parts. Parts that have no reference designator or partnumber ar...

Related Documentation The following manuals can be ordered from Hewlett-Packard’sSupport Materials Organization (SMO). The phone number forSMO is (800) 227-8164. HP LaserJet 5/5M/5N Documents—Description Part Number Getting Started Guide for the HP LaserJet5/5M/5N Printer C3917-90901 HP LaserJet 5/5...

Laser Statement (Sweden/Finland) LASERTURVALLISUUS LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT HP LaserJet(s) 5/5M/5N laserkirjoitin on käyttäjän kannaltaturvallinen luokan 1 laserlaite. Normaalissa käytössäkirjoittimen suojakotelointi estää lasersäteen pääsyn laitteenulkopuolelle. Kirjoittimen on hyv...

Control Panel Layout The LaserJet 5 control panel consists of a 16-character scrollingdisplay panel and six keys, three of which have forward andbackward scrolling functions. Figure B-2 shows the display panel. Control Panel Keys The table on the following page explains how the control panelkeys wor...

Control Panel Menus Figure B-3 shows the menus and menu items available with thebasic printer configuration. Not all menu items are discussed inthis section. Only those items of specific interest from a servicestandpoint, or items new to the printers are discussed in thissection. If options such as ...

Figure B-3 Control Panel Menu Map B-14 LaserJet 5/5M/5N Printer

Printing Menu Item Options Explanation PRINT MENUMAP No options available When PRINT MENU MAP is displayed, press Select to print a configuration page and a menumap. The message PRINTING CONFIGURATION PAGE is displayed. PWRSAVE OFF, 15 MIN,30 MIN*,1 HR,2 HRS,3 HRS PWRSAVE stands for PowerSave. This ...

Item Options Explanation ORIENTATION P*L P stands for portrait (vertical) and L stands for landscape (horizontal) orientation of type onthe page. FORM(5 TO 128 LINES) 60* (110V printers)64* (220V printers) Sets vertical spacing, from 5 to128 lines, for default paper size.Press - Value + once to chan...

PCL Fonts Menu Item Options Explanation PCL FONTLIST No optionsavailable Press Select to print a list of the PCL fonts. SOURCE INTERNAL*SOFTSLOT N Internal fonts*Permanent soft fontsSIMM Module: n=slot number. Typefaces stored inone of the four ROM SIMM slots (SLOT=slot 1, forexample). FONTNUMBER 0 ...

PostScript Menu Job Menu Item Options Explanation PS FONT LIST No options available Press Select to print a list of the fonts. While the list is being printed, the message PRINTING FONT LIST is displayed. PRT PS ERRS OFF* ON PRT PS ERRS stands for PRINT POSTSCRIPT ERRORS . This setting allows PostSc...

Configuration Menu Item Options Explanation TRAY 1 FIRST* CASSETTE When set to FIRST , Tray 1 is configured as the default tray and will be used first duringprinting if any media is loaded into the tray. TRAY 1=FIRST is not recommended for networked (shared) environments. When set to CASSETTE , Tray...

Memory Configuration Menu Item Options Explanation I/O BUFFER AUTO* OFF ON Memory set aside for I/O buffering isautomatically determined by the printer. No memory is set aside for I/O buffers. Size can be manually adjusted. I/O SIZE 10K and up When IO BUFFER is set to ON , this item appears in the m...

Resets Menu N o t e The control panel resets will clear all memory inthe printer, while the Job Cancel feature onlyclears the current job. Menu Selection Printer Response Explanation MEMORYRESET CLEARING MEMORY Press Select to perform a MEMORY RESET . This will clear the printer buffer and return al...

Test Menu Item Explanation PRINT SELF TEST When PRINT SELF TEST is displayed, press Select to print a self test. PRINT LJ5 DEMO Prints a page that illustrates the LJ5 printer features. PRINT CONFIG Prints a PostScript configuration page. PRINT LJ5M DEMO Prints a page that illustrates the LJ5M printe...

Programming a Flash SIMM A flash SIMM may be programmed while installed in the printer.To program a flash SIMM. 1 Hold down the Menu> , Item< , Value+ , and Select keys while powering on the printer. 2 The printer will display “ PROGRAM SLOT 4 ”. To change the slot number, press Value+/- . 3 O...

Changing the Control Panel Display Language The default control panel display language is set for English.Supported languages are: English, French, German, Italian,Spanish, Finnish, Danish, Dutch, Swedish, Norwegian, Turkish,Polish, and Portuguese. Follow these instructions to change thedisplay lang...

NVRAM Init NVRAM Init clears the NVRAM to its initial state. This reset isused when the NVRAM becomes full and the user would like toadd additional personalities. It is possible to reconfigure theNVRAM so the new personalities have higher priority and theolder personalities, while they can still be ...

Understanding the PCL Self TestPrintout Reference Explanation (Refer to Figure B-4) 1 Printer Information lists printer specific statistics. Formatter Number shows the unique number assigned tothe formatter board. Firmware Datecode is the eight-digit date (YYYYMMDD)code of the Formatter ROM. Page Co...

Figure B-4 HP LaserJet 5 PCL Self Test Printout LaserJet 5/5M/5N Printer B-33

Infrared Communication The HP LaserJet 5, 5M, and 5N printers are equipped with anInfrared Datalink Association (IrDA) compliant port. The IrDAspecification allows “wireless” transmission of print data betweena wide variety of hosts (primary) and peripheral (secondary)devices. A primary device — suc...

System Requirements • Hardware • Both the primary and secondary devices must be equippedwith an IrDA-compliant IR component. Older,non-IrDA-compliant devices may not be compatible with theHP LaserJet 5/5M/5N printers. • Software • The primary device must be loaded during boot-up withsoftware provide...

To Print Using the Infrared Port The C2929A Infrared Transceiver must be plugged into theinfrared (IR) port on your HP LaserJet 5, 5M, or 5N printer,located at the rear of the printer (Figure B-6). This port iscompliant with the specifications determined by the InfraredData Association (IrDA). On to...

3 Send the print job. The status light on top of the IR pod turnson. (Printing a complex document or using a software printspooler on your PC may delay the time it takes for the IRstatus light to turn on.) If the status light does not turn on,realign the port on your portable equipment with the pod,...

If you still have problems printing, make sure you are using anIrDA-compliant device and proper software and have selected theproper port for printing. N o t e The IrDA standard for infrared communicationsrepresents an emerging technology. Oldernon-IrDA-compliant portable devices may not becompatibl...

If all these elements are properly installed and configured, usethe IR test tool to test the IrDA protocol transmission and deviceoperation. This tool for troubleshooting IR communicationproblems, shown in Figure 10, has been developed by GenoaTechnology, Inc., in cooperation with Hewlett-Packard. T...

Infrared Port Not Responding Situation Solution The connection cannot beestablished or the transmissionseems to be taking longer thanusual. Make sure the device you areusing is IrDA-compliant; look foran IrDA symbol on the device orrefer to the manual for the devicefor IrDA specifications. Make sure...

Situation Solution The printer prints only part of apage or document. The connection has been brokenduring transmission. If you movethe portable device duringtransmission, the connection canbe broken. IrDA-compliantdevices are designed to recoverfrom temporary connectioninterruptions. Re-establish t...

Index ! 12 PRINTER OPEN 7-18 13 PAPER JAM 7-2014 NO EP CART 7-25 16 TONER LOW 4-10, 7-25 21 PRINT OVERRUN 3-53 41.1 ERROR 7-28 41.2 ERROR 7-28, 7-31 41.3 ERROR 7-28 41.4 ERROR 7-28 41.5 ERROR 7-28 50 service error 7-29 51 ERROR Message 7-31 52 ERROR 7-32 57 SERVICE 7-33 58 SERVICE fan failure 7-34 A...

Copyright © 1996 Hewlett-Packard CompanyPrinted in USA 3/96 Manual Part No.C3916-90984 *C3916-90984* *C3916-90984* C3916-90984