Brother 3450CN - HL Color Laser Printer- User Manual

REGULATIONS vi REGULATIONS LASER SAFETY (FOR 110-120 V MODEL ONLY) This printer is certified as a Class I laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that t...

HL-3450CN SERVICE MANUAL vii IEC 60825 SPECIFICATION (FOR 220-240 V MODEL ONLY) This printer is a Class 1 laser product as defined in IEC 60825 specifications. The label shown below is attached in countries where required. This printer has a Class 3B Laser Diode which emits invisible laser radiation...

SHIPMENT OF THE PRINTER viii SAFETY INSTRUCTIONS SAFETY PRINCIPLE 1) Before starting any operations, read this manual thoroughly. Especially read the safety instructions in this section carefully and ensure that you understand the contents. 2) Perform all the operations by following the procedures d...

HL-3450CN SERVICE MANUAL ix WARNING HAZARDOUS VOLTAGE May cause serious injuries or fatal accidents. Voltage is now applied from the power supply of printer. There is a danger of electrical shock if you touch the active area inside the printer. Be sure to turn the power supply switch OFF and pull th...

HL-3450CN SERVICE MANUAL xi CAUTION Do not lean against or apply any excessive force to the paper cassette, open cover of Duplex unit. Otherwise it may cause the product to decline or fall down and result in the injuries.

SHIPMENT OF THE PRINTER xii <Label Location> 1. Hot Caution Label AVERTISSEMENT WARNING WARNUNG Hot surface.Avoid contact. Heiße oberfiäche.Bei beseitigung. Surface chaude.Eviter tout contact. 2. Laser Caution Label 5mW 7 8 0 n m - 8 0 0 n m DANGER- INVISIBLE LASER RADIATION WHEN OPEN.AVOID DI...

HL-3450CN SERVICE MANUAL xiii 3. Rating Label (For US) (For Europe) 4. Operation Label 5. Jam Label

SHIPMENT OF THE PRINTER xiv SHIPMENT OF THE PRINTER If for any reason you must ship the printer, carefully package the printer to avoid any damage during transit. It is recommended that you save and use the original packaging. The printer should also be adequately insured with the carrier. CAUTION N...

CHAPTER 1 PRODUCT OUTLINE 1-2 CONTENTS CHAPTER 1 PRODUCT OUTLINE ..................................................... 1-3 1. FEATURES .......................................................................................................... 1-3 2. PARTS NAMES & FUNCTIONS ..........................

HL-3450CN SERVICE MANUAL 1-3 CHAPTER 1 PRODUCT OUTLINE 1. FEATURES This printer has the following features: 2400 x 600 dpi Class Resolution The printer prints pages with a resolution of 600 dots per inch (dpi) as default. It also provides higher quality printout which is the equivalent of 2400 x 600...

HL-3450CN SERVICE MANUAL 1-5 Toner Save Mode The printer has an economical toner save mode. This mode allows you to reduce the printer running cost substantially in addition to the improved life expectancy of the toner cartridge. Reprint Function A touch of a panel button allows reprinting of the la...

CHAPTER 1 PRODUCT OUTLINE 1-8 3. INTERNAL STRUCTURE <Cross Sectional View > K Y M C Fig. 1-3 No. Components Name Outline of Functions 1 Toner Cartridge Contain the toner (K, Y, M, C) for developing. Each toner cartridge (K, Y, M, C) is independent. 2 OPC Belt Cartridge Forms images and include...

HL-3450CN SERVICE MANUAL 1-9 4. DESCRIPTION OF CONTROL PANEL The printer control panel provides control of the printer including test printing, maintenance operations performed by the video controller and also the ones which are performed by the engine controller. The Video Controller Mode and the E...

CHAPTER 1 PRODUCT OUTLINE 1-10 Back Go Job Cancel Alarm Power Data Ready Menu Reprint Secure Print Set K C M Y 1 9 4 10 13 12 6 5 2 3 11 7 8 Fig. 1-4 No. LED / Button Name 1 LCD: 16 character by 2 lines 2 Power LED 3 Ready LED 4 Data LED 5 Go button 6 Job Cancel button 7 Alarm LED 8 Secure Print but...

HL-3450CN SERVICE MANUAL 2-3 CHAPTER 2 SPECIFICATIONS 1. RATING WARNING Use the power supply cable supplied with the printer, or a similar cable complying with the following specification (3-wire power cable with ground). Use of an “out of specification” cable may result in an electric shock. Destin...

CHAPTER 2 SPECIFICATIONS 2-4 2. GENERAL SPECIFICATIONS 2.1. Printing Print method Electro photography by semiconductor laser beam scanning Laser Wavelength: 780nm Output: 5mW max. Resolution 600 x 600 dots per inch (Fine) 2400 x 600 dots per inch (using HRC and CAPT) (The resolution can be enhanced ...

HL-3450CN SERVICE MANUAL 2-5 2.3. Electrical and Mechanical Power source U.S.A. and Canada: AC 120V, 50/60Hz Europe and Australia: AC 220 to 240V, 50/60Hz Power consumption Printing (peak*): 1350W or less Printing (average): 600W or less Standing by (peak*): 1350W or less Standing by (average): 200W...

CHAPTER 2 SPECIFICATIONS 2-6 2.4. Paper The standard media cassette (upper cassette) is supplied with the printer. The optional lower tray unit and the optional A4/Letter cassette can also be installed. NOTE: The standard upper cassettes and the optional A4/Letter cassette are interchangeable betwee...

CHAPTER 2 SPECIFICATIONS 2-8 2.4.2 Media cassette capacity Maximum load height: 27mm (1.06 inches) x Plain paper: 250 sheets of 75g/m 2 (20lb) paper for the standard/optional A4/Letter cassette 500 sheets of 75g/m 2 (20lb) for the optional lower cassette x Envelopes : 15 sheets x Transparency: 50 sh...

HL-3450CN SERVICE MANUAL 2-9 Table 2-1: Effective Printing Areas Size A B C D E F A 4 210.0mm 8.27” (2,480 dots) 297.0mm 11.69” (3,507 dots) 203.2mm 8.0” (2,400 dots) 288.5mm 11.36” (3,407 dots) 3.4mm 0.13” (40 dots) 4.23mm 0.17” (50 dots) Letter 215.9mm 8.5” (2,550 dots) 279.4mm 11.0” (3,300 dots) ...

CHAPTER 2 SPECIFICATIONS 2-10 2.5.2 Print guarantee area <Plain paper> Fig. 2-2 <Envelope> Fig. 2-3 Paper: 5mm Other: 10mm Paper: 4mm Other: 10mm 3mm 5mm 5mm 3mm Print guarantee area Print guarantee area Non guarantee area Non printable area Non printable area Non guarantee area 4mm 4mm ...

HL-3450CN SERVICE MANUAL 2-11 3. ENVIRONMENTAL CONDITIONS 3.1 Ambient Temperature / Humidity / Altitude (1) Under Operational conditions: 10.0 a 32.5 q C (50 ~ 90.5 q F), 20 a 80%RH (See the figure below) 10 0 17.5 20 27 30 32.5 40 20 60 70 80 40 Ambient Humidity (%RH) Ambient Temperature ( ) C 50 (...

CHAPTER 2 SPECIFICATIONS 2-12 (3) Storage and transportation environment of printer The following defines the storage and transportation environment of printers that have been packed according to Brother specification. However, this section does not cover the OPC belt cartridge, toner cartridges and...

HL-3450CN SERVICE MANUAL 3-3 CHAPTER 3 INSTALLATION 1. CONDITIONS REQUIRED FOR INSTALLATION Any Laser beam printer is likely to be influenced by the environment of the set-up location. If the printer is set-up in an inappropriate location, the printer may not perform as expected. Therefore, the foll...

HL-3450CN SERVICE MANUAL 3-5 2. UNPACKING WARNING x The package containing a printer weighs approximately 66kg (145lbs), so it is too heavy for one person to carry. It needs two adults or more to move the printer. Since the printer is a precision machine, make sure that it is carried slowly with car...

HL-3450CN SERVICE MANUAL 3-7 2.2 Unpack the Starter Kit <Unpacking Procedure> 1) Open the vinyl bag and slide off the cardboard sleeve covering the starter kit. 2) Confirm all of the following parts are inside the starter kit packing box. No. Kit Name Appearance Quantity 1 Toner Cartridge (Y, ...

CHAPTER 3 INSTALLATION 3-8 3. INSTALLATION WORK CAUTION Do not lean against or apply any excessive force to the media cassette or open covers; otherwise it may cause the product to tilt or fall over and result in injuries. Install the parts of the starter kit into the printer according to the follow...

HL-3450CN SERVICE MANUAL 3-9 NOTE: The retainer lock levers for the fuser cleaner and oil bottle are located as shown in the figure below; Fig. 3-6 3.2 Install the OPC Belt Cartridge PRECAUTION x Do not directly touch the OPC belt surface with bare hands or gloves. x If the belt is exposed for more ...

HL-3450CN SERVICE MANUAL 3-11 3.3 Install the Toner Cartridges into the Printer (1) Rock each of the cartridge 3 to 4 times through 30 o to the horizontal. Fig. 3-11 (2) Pull off the tape labeled ‘REMOVE’ from the toner cartridge. Fig. 3-12 (3) Remove the protective cover from the toner cartridge. F...

CHAPTER 3 INSTALLATION 3-12 3.4 Install the Media Cassette and Adapter 3.4.1 Install the media cassette (1) Remove the cassette cover from the media cassette. Fig. 3-16 (2) Set the paper guide according to the print paper size. i) Horizontal direction; Holding the green side plate to meet the paper ...

HL-3450CN SERVICE MANUAL 3-13 3.4.2 Install the envelope adapter NOTE: The specification of envelopes feedable from the envelope adapter are as follows; x Capacity: 15 envelopes x Size: DL (110 x 220 mm), #10 (105 x 241 mm) (1) Prepare the media cassette and envelope adapter. (2) Put the adapter on ...

CHAPTER 3 INSTALLATION 3-14 3.5 Test Print (1) Make sure the printer power button is off. Do not connect the interface cable. (2) Connect the AC power cord to the printer, and then plug it into the AC outlet. Fig. 3-24 (3) Turn on the power button. Fig. 3-25 Fig. 3-23

HL-3450CN SERVICE MANUAL 3-15 (4) After the printer warms, the READY message will appear. K C M Y HL-3450CN NETWORK READY Data Ready Power Alarm Reprint Back Set Secure Print Go Job Cancel Fig. 3-26 (5) Press the Go button. The printer will print a test page. Check that the test page is printed corr...

HL-3450CN SERVICE MANUAL 4-3 CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 1. BASIC STRUCTURE 1.1 Mechanical Structures This laser beam color printer (hereinafter called “Printer”) consists of five mechanical systems; Print, Transfer, Scanning, Paper Transport and Control System. The printer produces col...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-4 Paper Exit Unit Fusing Unit Transfer Unit AC Discharger Unit Transfer Roller Transport Roller Paper Exit Fix Paper Discharger Drum Cleaner Unit Erase Lamp MM Discharge Charge Exposure Development Paper Feed Paper Cassette DC Charger DM Scanner Unit LD SCM...

HL-3450CN SERVICE MANUAL 4-5 (5) Control System The control system consists of the following 4 (four) control parts and runs the printer by processing the interface signals transmitted from the Host computer and interfacing to the print, transfer, scanning and transport systems. x Sequence Control x...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-6 Y M C K Fig. 4-3 a Y Y Y M M M C C Y Y Y C C C Transfer Drum b M M M Y Y Y C C C C C Y Y Y Paper C Paper Red Green Cyan Toner R C G a First Transfer b Second Transfer C Fusing Fig. 4-4 OPC belt Toner cartridge Transfer crum

HL-3450CN SERVICE MANUAL 4-7 1.3 Structure of the OPC Belt The OPC belt consists of a surface layer having a photoconductor (OPC) of organic material, the inner layer of an insulator material (PET) and an aluminum deposit layer in between. The OPC belt is located as shown in Fig.4-5 as the main part...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-8 1.4 Print System and Transfer System Fig.4-7 shows the basic structure of the print system having the OPC belt as the main part and the transfer system having the transfer drum. Color printing is achieved by actuating in sequence each process in the print...

HL-3450CN SERVICE MANUAL 4-9 1.4.1 Structure of the printer No. Component Part Process 1 Charger Charging 2 Scanner Unit Exposing 3 Toner cartridge Developing 4 OPC belt cartridge Receives the Image 5 Transfer drum Transfers the Image 6 Erase lamp Discharges the Belt 7 Cleaning blade Cleaning the Be...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-10 1.4.2 Basic structure of the printing system A toner image is formed through the potential of the OPC belt varying in each of the charger, exposure, development, transfer and cleaning processes. (1) Process of Print System (See Fig.4-9.) i) The OPC belt ...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-12 1.4.3 Details of each process 1 Charging The charging process ensures that the OPC belt is evenly charged by the charger system. (1) Structure of the charger unit (Refer to Fig.4-8 and Fig.4-11) i) The charger unit is located as shown in Fig.4-8. ii) The...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-14 3 Developing The developing process means that an electrostatic latent image on the OPC belt is made visible by depositing toner onto the exposed areas of the OPC belt. (1) Structure of the Toner Cartridge (Refer to Fig.4-8 & 4.14.) i) The toner cart...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-18 5 Belt Discharging (Erase Lamp) The belt discharging process means that upon completion of the drum transfer process, an LED light is radiated onto the OPC belt prior to mechanically cleaning the belt to discharge the residual charge. (1) Structure of Er...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-20 7 Second Transfer (Paper) The second transfer process is where the toner image on the transfer drum is transferred onto the transported paper. (1) Second Transfer Structure i) The transfer roller for the paper transfer is located as shown in Fig.4-8. ii)...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-22 9 Drum Cleaning The drum cleaning process is where the residual toner on the transfer drum is removed. (1) Structure of Drum Cleaning (Refer to Fig.4-23.) i) The drum cleaning unit is located as shown in Fig.4-8. ii) The drum cleaning brush is a semicond...

HL-3450CN SERVICE MANUAL 4-23 1.5 Scanning System This printer employs a semiconductor laser diode as a light source. This laser diode is switched according to the transmitted image data (video signal). The generated laser light scans over the OPC belt through a polygon mirror and lens, by which met...

HL-3450CN SERVICE MANUAL 4-25 1.6 Paper Transportation System 1.6.1 Outline This printer employs automatic paper feeding from the media cassette. When toner images are formed on the transfer drum through the operations of the print system and transfer system, paper is fed by the pick-up roller and t...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-26 1.7 Fusing Unit The fusing unit employs a thermal fusing system using heater lamps in the rollers. Paper carrying the combined toner image passes between the heat rollers. Heat and pressure is applied to the paper when passing between the heat rollers so...

HL-3450CN SERVICE MANUAL 4-27 1.7.2 Fusing process c Silicone oil supplied from the oil bottle is applied to the surface of fuser roller. d The toner image has been transferred onto the paper, but not yet fused. e Transported paper passes between the heater roller and back-up roller. f Each roller i...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-28 2. STRUCTURE OF THE CONTROL SYSTEM 2.1 Basic Structure - Electrical System and Functions Most of the main electrical parts of this printer are controlled by the MCTL (engine controller) PWB. <Structure of the sequence control> The basic structure o...

HL-3450CN SERVICE MANUAL 4-31 Layout of PCBs Fig. 4-29 9. Power supply (LVPS) PCB 10. High-voltage power supply (HVU) PCB 1. Video controller PCB 4. LDU PCB 2. Engine controller PCB (MCTL PWB) 7. IOD1 PWB 8. IOD2 PWB 6. Erase lamp 3. Control panel PCB (Panel PWB) 5. PDU PCB

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-34 Layout of Clutches 2 9 1 3 7 6 5 4 8 1 0 Fig. 4-31

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-36 Layout of Sensors Fig. 4-32 15. Paper full sensor 2. Paper feeding sensor 6. OHP sensor 8. Drum encoder sensor 9. Belt sensor 5. Oil sensor 13. Cleaning roller sensor 14. Temperature sensor (Thermistor to detect) 7. Drum jam sensor 11. Waste toner sensor...

HL-3450CN SERVICE MANUAL 4-37 2.2 Control System - Control of the Print Process A Micro CPU mounted on the MCTL PWB controls the print processes. <Print Sequence Diagram> Host Computer I/F Control Control Panel Cooling Fan Belt Sensor Drum Sensor DM ATC (4 pcs.) Y M C K Scanner Motor LDU PD La...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-40 (3) Control of the Fusing Temperature Each roller of the fusing unit is controlled to maintain the appropriate temperature so that toner will be fixed correctly onto the print paper. <Basic Structure of Temperature Control (Fig.4-36)> FLS: Thyristo...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-44 (c) Interface Circuit (Printer side) Table 4-1: Interface Circuit No. Interface Circuit Signal Name 1 x VIDEO-N x VIDEO-P 2 x HSYNC-N x HSYNC-P 3 x PRREQ-N x COMMAND-N x ID1-N x ID2-N 4 x VSYNC-N x IREADY-N x STATUS-N x KEY-STATUS-N

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-46 2.3 Main PCB (Video Controller PCB) 2.3.1 Outline The main PCB consists of the circuits which perform the following functions; x Receive the printing data from the computer. x Convert the received data to the bitmap data such as characters or graphics. x...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-48 2.3.2 Circuit (1) CPU block x Model name: TMPR4955-266MHz MiPS 64 bits RISC CPU manufactured by TOSHIBA x Clock speed: 66.7MHz (external) / 266MHz (internal) x Cache memory: 32KB (Command cache) / 32KB (Data cache) x Bus width: 32 bits (external) / 64 bi...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-50 Fig.4-38 shows the timing of each signal after the power switch is turned on. Power On IREADY-N PRREQ-N VSYNC-N VSYNC-N HSYNC-N VIDEO-P VIDEO-P 210s MAX. 0.1sec. MIN.15sec. MAX. 15us MIN.10ms MAX. 1.0sec. MAX. 3.0sec. MAX. for Continuous Printing (K) dat...

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 4-60 2.4 Low-voltage Power Supply Unit (1) Outputs and Use Output Terminal Rated Output Use +5V-1 For control of the printer +5V-1R 4.8 a 5.3V, 8.5A For control of the laser +5V-2 For control of the interface (7A Max.) +24V-1 +24V, 6.5A For control of printer...

HL-3450CN SERVICE MANUAL 4-63 2.5 High-voltage Power Supply Unit (1) Outputs and Function No. Function Power Supply (P/S) P/S Name Approx. Output Voltage 1 Charging CHV (-) (4.6KV) 600µA 2 First transfer CBV (-) 200V a 900V 3 Developing Y, M DBV (-A) 200V a 400V bias C, K DBV (-B) 200V a 400V 4 Seco...

HL-3450CN SERVICE MANUAL 4-65 2.6 Connection Diagram 1 10 DCN10 DCN9 9 1 25 26 DCN8 2 1 11 DCN7 1 1 7 DCN6 13 DCN5 1 13 DCN4 1 4 DCN3 2J84D9733A 1 2 27 28 DCN2 DHOZA5 5 50 49 A B C DE F G H A DCN1 1 2 13 DCN18 DCN17 1 2 17 18 DCN16 1 9 DCN15 1 3 DCN14 1 12 DCN13 1 2 9 10 16 9 8 1 9 8 IC8 LS151 8 1 4...

HL-3450CN SERVICE MANUAL 5-3 CHAPTER 5 CONTROL PANEL OPERATION 1. PANEL LAYOUT Back Go Job Cancel Alarm Power Data Ready Menu Reprint Secure Print Set K C M Y 1 9 4 10 13 12 6 5 2 3 11 7 8 Fig. 5-1 No. LED / Button Name 1 LCD: 16 character by 2 lines 2 Power LED 3 Ready LED 4 Data LED 5 Go button 6 ...

CHAPTER 5 CONTROL PANEL OPERATION 5-4 2. VIDEO CONTROLLER MODE This section describes the operation and maintenance functions in the Video Controller Mode. 2.1 Configuration of Operational Mode This printer has various functions as set out in Table 5-1 for users to easily perform general test printi...

HL-3450CN SERVICE MANUAL 5-5 2.2 Line Test Mode This mode tests the following items; Item Self-test Description LCD TEST Displays the checker pattern LED TEST Checks that all LEDs are on / off. SW TEST Checks that all buttons work correctly. SENSOR TEST Checks that all sensors work correctly. RAM SI...

CHAPTER 5 CONTROL PANEL OPERATION 5-6 3) Press the Go button to implement the SW TEST. The following display appears on the LCD and the LEDs are all turned off. Check that the LEDs are turned on and the corresponding number appears as follows when pressing the buttons on the control panel in order. ...

HL-3450CN SERVICE MANUAL 5-7 5) Press the Go button to implement the RAM SIZE CHECK. The RAM size installed into the printer is displayed. Check that the RAM size is correct. R A M S I Z E = 6 4 M B R A M C H E C K S T A R T 6) Press the Go button to implement the TRAY1 CHECK. The paper size of the ...

CHAPTER 5 CONTROL PANEL OPERATION 5-8 8) Press the Go button to implement the COMPACT FLASH - R/W TEST. The reading/writing test of the compact flash card is implemented. Check that no error occurs. C A R D R / W O K C A R D R / W S T A R T CARD R/W OK: The compact flash card works correctly. CARD R...

HL-3450CN SERVICE MANUAL 5-9 2.3 DRAM Test Mode This mode tests DIMMs installed on the main (video controller) PCB. <Procedure> 1) To start the test program: While holding down the Go button and + button, turn on the power. “DRAM CHECK START” will be displayed. Press the Job Cancel button to s...

CHAPTER 5 CONTROL PANEL OPERATION 5-10 2.4 Test Print Mode This mode prints the specified pattern in order to check the engine. <Procedure> 1) Press the -, + Set buttons in this order while holding down the Go button to enter the test print mode. 2) The ‘PRINT MENU’ message is displayed on the...

HL-3450CN SERVICE MANUAL 5-11 3. ENGINE CONTROLLER MODE This section describes the operation and setting procedures for each engine test in the Engine Controller Mode. In order to go into the Engine Controller Mode, turn on the printer while holding down the Secure Print, Back, Set buttons. 3.1 Conf...

HL-3450CN SERVICE MANUAL 5-13 3.2 Operation of Normal Mode Normal Mode displays on the control panel the operational status of the printer when in the “ONLINE” state and the necessary information for the operator to implement ordinary maintenance work. Operation Procedures (1) Press the power button...

CHAPTER 5 CONTROL PANEL OPERATION 5-16 Code No. LCD Message Description of Message 12-2 STACKER FULL 12 STACKER FULL [*4] x The engine is ready to print. x The Power LED is lit. x Remove the paper on the stacker (paper exit tray), then press the - button. 13 REPLACE TONER 13 REPLACE [*5] TONER [*4] ...

HL-3450CN SERVICE MANUAL 5-17 Code No. LCD Message Description of Message 15 MISPRINT 15 MISPRINT [*6][*4] x The engine is idling. x The Power LED is lit. [*6] The type of misprint error is indicated as follows; NOPQR: No PRREQ-N signal is available. PAPER: No paper is available in the feeder while ...

CHAPTER 5 CONTROL PANEL OPERATION 5-18 Code No. LCD Message Description of Message 16-4 ALIGN BELT CG 16 ALIGN BELT CG [*4] x The engine is stopped. x The Power LED is lit. x The OPC belt cartridge is not installed. Reconfirm the installation status of the OPC belt cartridge. x This message will be ...

HL-3450CN SERVICE MANUAL 5-19 Code No. LCD Message Description of Message 19 SLEEP MODE 19 SLEEP MODE [*4] x The engine is idling. x The Power LED is lit. x This mode is cleared by sending a WAKE-UP command (EC24) from the video controller. x The printer is ready to print after the warming-up proces...

CHAPTER 5 CONTROL PANEL OPERATION 5-20 3.3 Service Mode Service Mode is a unique mode for the maintenance of the printer only, without the video controller card. In this mode, you can check the operation status of the printer engine Off-line and also carry out maintenance work for each of the printe...

CHAPTER 5 CONTROL PANEL OPERATION 5-22 32 NEXT CARE INFORMATION Information relating to the replacement timing of periodical replacement parts can be obtained. This is the life for each of the components in images or pages. Procedure Description of Procedures LCD Message 1) Press the Reprint button ...

CHAPTER 5 CONTROL PANEL OPERATION 5-24 34 TOTAL PAGE The total number of printouts can be confirmed. Procedure Description of Procedures LCD Message 1) Press the Reprint button after selecting Screen (a) “TOTAL PAGE” mode. (a) o (b) 2) Select one type of page from among TOTAL PAGE, LFU PAGE and DPL ...

HL-3450CN SERVICE MANUAL 5-31 43 MARGIN ADJUST The position of the top margin and left margin can be confirmed and adjusted within the range -3.5mm max. and +3.5mm max. NOTE: It is recommended to use the default value in normal use. Do not perform this mode frequently. Procedure Description of Proce...

CHAPTER 5 CONTROL PANEL OPERATION 5-32 44 LIFE PERIOD Replacement life of the periodical replacement parts can be set. NOTE: It is recommended to use the default value in normal use. Do not adjust these settings without authorization. Procedure Description of Procedures LCD Message 1) Press the Repr...

CHAPTER 5 CONTROL PANEL OPERATION 5-34 45-1 LP TUNE UP This mode should be used when optical density, line thickness and/or color reproduction needs to be adjusted. The adjustment is made by changing the laser power against the reference value 0 (zero) in the range -4 to +4. NOTE: Do not perform thi...

CHAPTER 5 CONTROL PANEL OPERATION 5-40 46 NVRAM INITIAL This mode can initialize (data clear) all the data in the NVRAM on the MCTL PWB. CAUTION BEFORE USING THIS MODE, THE VALUES FROM ‘34 TOTAL PAGES’ AND ‘35 EACH IMAGE’ MUST BE READ TO ENABLE THE CORRECT VALUES TO BE RESET USING FUNCTIONS 47 AND 4...

HL-3450CN SERVICE MANUAL 5-41 47 TOTAL PAGE SET This mode can reset the number of total pages in the NVRAM whenever NVRAM INITIAL has been executed or the MCTL PWB is replaced. NOTE: Do not perform this mode other than when replacing the MCTL PWB. Description of Procedures LCD Message 1) Press the R...

HL-3450CN SERVICE MANUAL 5-43 49 NEXT LIFE SET This mode can set the replacement timing (number of prints) of periodic replacement parts. NOTE: Do not perform this mode other than when replacing the MCTL PWB. Description of Procedures LCD Message 1) Press the Reprint button after selecting Screen (a...

CHAPTER 5 CONTROL PANEL OPERATION 5-44 3.4 Adjustment Work Procedures 3.4.1 Adjustment of top and left margin The top and left margins can be adjusted by button operation on the control panel. <Purpose> If there is no top margin or left margin set for the print guarantee area or when the MCTL ...

HL-3450CN SERVICE MANUAL 5-45 3.4.2 Setting of engine NVRAM data As data in the NVRAM has been preset to the optimum value at the factory, it is not necessary to change the preset values under normal conditions. However, fine adjustment may be required subject to the media or operational conditions....

CHAPTER 5 CONTROL PANEL OPERATION 5-46 3.4.3 Confirmation and setting of total number of printouts The total number of printouts is stored in the RAM. Confirmation and setting of total number of printouts can be carried out on the control panel. <Purpose> Total number of printouts will be rese...

HL-3450CN SERVICE MANUAL 5-47 3.4.5 Initial setting of engine NVRAM Implement the initial setting at the replacement of MCTL PWB after clearing the contents of NVRAM. <Purpose> The number of images for each color will be reset when changing the MCTL PWB or executing NVRAM INITIAL. <Procedur...

HL-3450CN SERVICE MANUAL 6-3 CHAPTER 6 PERIODIC MAINTENANCE 1. GENERAL 1.1 Handling Precautions Since this high quality laser printer is a precision equipment, daily checking and periodic maintenance is indispensable to maintain the expected high performance. The following is the list of important p...

CHAPTER 6 PERIODIC MAINTENANCE 6-4 1.2 List of Maintenance Tools Table 6-1 below lists the maintenance tools required for the printer. Table 6-1 No. Tool Name Function 1 Phillips Screwdriver #1 For M3 2 Phillips Screwdriver #2 For M4 3 Phillips Screwdriver (short shank) #2 For M4 4 Slotted Screwdriv...

HL-3450CN SERVICE MANUAL 6-5 1.3 List of Consumables for Maintenance Table 6-2 below lists the consumables for maintenance. Table 6-2 No. Tool Name Quantity Function 1 Toner Cartridge (Y) 1 piece Test Print 2 Toner Cartridge (M) 1 piece Test Print 3 Toner Cartridge (C) 1 piece Test Print 4 Toner Car...

CHAPTER 6 PERIODIC MAINTENANCE 6-6 2. PERIODIC MAINTENANCE CLEANING See Table 6-3 for details of periodic maintenance cleaning for the following parts. (1) Register Roller (2) Paper Guide (3) Paper Exit Roller (4) Transfer Roller (5) Paper Discharger (6) OPC Belt Cartridge (7) Transfer Drum (8) Dust...

HL-3450CN SERVICE MANUAL 6-9 2.1 Cleaning the Register Roller The register roller should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Turn off the power supply, and unplug the power cable. (2...

CHAPTER 6 PERIODIC MAINTENANCE 6-10 2.2 Cleaning the Paper Guide The paper guide should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Remove the media cassette from the printer. (2) Remove pap...

HL-3450CN SERVICE MANUAL 6-11 2.3 Cleaning the Paper Exit Roller The paper exit roller should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Turn off the power supply, and unplug the power cabl...

CHAPTER 6 PERIODIC MAINTENANCE 6-12 2.4 Cleaning the Transfer Roller The transfer roller should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Turn off the power supply, and unplug the power ca...

HL-3450CN SERVICE MANUAL 6-13 2.5 Cleaning the Paper Discharger The paper discharger should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare x Cotton cloth (2 a 3 pieces) x Cotton swab (2 a 3 pieces) Cleaning Procedure (1) Turn off the power supp...

CHAPTER 6 PERIODIC MAINTENANCE 6-14 2.6 Cleaning the OPC Belt Cartridge The OPC belt cartridge should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. PRECAUTION x Do not directly touch the OPC belt surface with bare hands or gloves. x If the belt is exposed for ...

HL-3450CN SERVICE MANUAL 6-15 2.7 Cleaning the Transfer Drum The transfer drum should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Turn off the power supply. (2) Open the rear access cover. (...

CHAPTER 6 PERIODIC MAINTENANCE 6-16 2.8 Cleaning the Dustproof Glass in the Laser Unit The dustproof glass in the laser unit should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare x Cotton cloth (2 a 3 pieces) x Cotton swab (2 a 3 pieces) Cleani...

HL-3450CN SERVICE MANUAL 6-17 2.9 Cleaning the Printer Interior The printer interior (bottom) should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. Tools to Prepare x Toner vacuum cleaner x Cotton cloth (2 a 3 pieces) Cleaning Procedure (1) Open the top cover a...

CHAPTER 6 PERIODIC MAINTENANCE 6-18 2.10 Cleaning the Oil Pad The oil pad should be cleaned according to the periodic maintenance cleaning cycle set out in Table 6-3. When time is due for replacement of the oil pad, the following message appears on the control panel.* REPLACE OIL PAD * The message c...

CHAPTER 6 PERIODIC MAINTENANCE 6-2 0 3. PERIODIC MAINTENANCE PARTS Maintenance Work should be implemented according to the “Periodic Maintenance Parts and Maintenance Cycle” set out in Table 6- 4. Table 6 -4: Periodic Maintenance Parts and Maintenance Cycle No. Maintenance Parts Description Replacem...

CHAPTER 6 PERIODIC MAINTENANCE 6-2 2 *1: These figures are based on an average of 5% coverage of the printable area for one color using A4/Letter-size laser paper. The frequency of replacement will vary, depending on the complexity of the prints, the percentage of coverage, the size of paper, pages/...

HL-3450CN SERVICE MANUAL 6-21 4. PERIODIC MAINTENANCE PROCEDURES The printer displays messages on the control panel screen to indicate replacement is due for most of the periodic maintenance parts in both the Video Controller Mode and the Engine Controller Mode. However, the procedure to clear the m...

CHAPTER 6 PERIODIC MAINTENANCE 6-22 (3) Release the belt cartridge lock levers at both sides (left & right). (Fig.6-11) (4) Pull out the OPC belt cartridge. Fig. 6-12 (5) Prepare a new belt cartridge. (6) Remove the protective sheet from a new OPC belt cartridge, and then pull and remove the ten...

HL-3450CN SERVICE MANUAL 6-23 4.2 Fusing Unit Replacement Criterion of Replacement The fusing unit should be replaced with a new one according to the periodical maintenance cycle set out in Table 6-4. When the time is due for replacement of the fusing unit, the following message appears on the contr...

HL-3450CN SERVICE MANUAL 6-25 (2) Plug the power cable into the power outlet and turn on the printer. (3) Upon completion of the warming-up process. (4) Press any of the Menu buttons (+, -, Set or Back) to take the printer Off Line. (5) Press + or – until “RESET MENU” appears. (6) Press Set to proce...

CHAPTER 6 PERIODIC MAINTENANCE 6-26 4.3 Transfer Roller Replacement Criterion of Replacement The transfer roller should be replaced at the same time as a new discharger according to the periodical maintenance cycle set out in Table 6-4. When time is due for replacement of the transfer roller, the fo...

CHAPTER 6 PERIODIC MAINTENANCE 6-28 4.4 Paper Discharger Replacement Criterion of Replacement The paper discharger should be replaced with a new discharger at the same time as the transfer roller according to the periodical maintenance cycle set out in Table 6-4. When time is due for replacement of ...

CHAPTER 6 PERIODIC MAINTENANCE 6-30 4.5 Drum Cleaner Replacement Criterion of Replacement The drum cleaner should be replaced with a new one according to the periodical maintenance cycle set out in Table 6-4. When time is due for replacement of the drum cleaner, the following message appears on the ...

HL-3450CN SERVICE MANUAL 6-31 (2) Holding the handle located on the top of the drum cleaner, push it backwards. (3) Remove the drum cleaner by lifting it out. (Fig.6-25) Fig. 6-26 (4) Clean the area where the drum cleaner is mounted. (Fig.6-26) (5) Install a new drum cleaner into the printer. Fig. 6...

CHAPTER 6 PERIODIC MAINTENANCE 6-32 4.6 Ozone Filter Replacement Criterion of Replacement Although the maintenance message indicating ozone filter replacement is not displayed on the LCD, the ozone filter should be replaced with a new one according to the periodical maintenance cycle set out in Tabl...

HL-3450CN SERVICE MANUAL 6-33 4.7 Paper Feeding Roller and Separator Pad Replacement Criterion of Replacement The paper feeding roller and separator pad should be replaced with new ones according to the periodical maintenance cycle set out in Table 6-4. When time is due for replacement of the paper ...

CHAPTER 6 PERIODIC MAINTENANCE 6-34 4.8 Transfer Drum Replacement Criterion of Replacement The transfer drum should be replaced with a new one according to the periodical maintenance cycle set out in the Table 6-4. When time is due for replacement of the transfer drum, the following message appears ...

HL-3450CN SERVICE MANUAL 6-35 4.9 Oil Pad Replacement Criterion of Replacement The oil pad should be replaced with a new one according to the periodical maintenance cycle set out in the Table 6-4. When time is due for replacement of the oil pad, the following message appears on the control panel.* R...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-4 CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 1. BEFORE STARTING DISASSEMBLY 1.1 Precautions Follow the precautions described below during maintenance work. (1) Do not implement any operation, disassembly or modification which is not set out in this manual. (2) ...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-6 2. PARTS NAME 2.1 Cover Front View Fig. 7-1 Rear View Fig. 7-2 Control panel Upper cover 4.2.5 Top cover (Paper exit unit cover) 4.4.2 Power button Front outer cover 4.5.1 Media cassette Base cover (R) 4.1.2 Side cover (R) 4.1.1 Paper exit upper cover 4.4....

HL-3450CN SERVICE MANUAL 7-7 2.2 Circuit Boards (PWBs) Fig. 7-3 2.3 Motor Units Fig. 7-4 Panel PWB 4.2.2 Erase lamp 4.2.11 Ozone fan (Cooling fan (OZ)) 4.1.9 High-voltage power supply PCB 4.3.3 Main motor (MM) 4.1.3 Low-voltage power supply PCB 4.3.8 Developer drive motor (DM) 4.1.4 MCTL PWB 4.3.2 F...

3. DISASSEMBLY FLOW 7-9 Registration Clutch TR Cam Clutch Cleaner Clutch 4.1.3 4.1.4 4.1.5 Control Fan Base Cover (R) 4.1.2 Developer Drive Unit 4.1.12 Main Gear Unit 4.1.10 Toner Sensor (TPD) 4.1.14 Side Cover (L) Side Cover (LF) Interlock Switch (Top) Transfer Drum Oil Sensor (OIL) Erase Lamp Eras...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-10 4. DISASSEMBLY PROCEDURE 4.1 Right Side of the Printer 4.1.1 Side cover 3 (R) (1) Remove the set screw BT4x10 (1 pc.) of side cover 3 (R) at the rear of the printer. Fig. 7-7 (2) Slide the side cover 3 (R) in the direction of the arrows as shown in Fig.7-...

HL-3450CN SERVICE MANUAL 7-11 4.1.2 Base cover 3 (R) (1) Remove the set screws BT4x10 (2 pcs.) from the base cover 3 (R). (2) Remove the base cover 3 (R) from the base. Fig. 7-9 PRECAUTION x When assembling the base cover, insert the leading edge of the base cover 3 (R) into the two hooks provided a...

HL-3450CN SERVICE MANUAL 7-13 4.1.4 Developer drive motor 3 (DM) CAUTION Take care not to stress the motor drive PCB when removing the connector or handling the motor / PCB assembly. (1) Disconnect the connector (1 pc.) from the developer drive motor PCB. (2) Remove the fixing screws ST3x6 (4 pcs.) ...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-16 4.1.8 Cleaner clutch 3 / Cleaner cam clutch 3 / Fuser clutch 3 (1) Remove the outer plastic C ring from the shaft of each of the clutches. (2) Pull out the cleaner clutch 3, Cleaner cam clutch 3 and fuser clutch 3 from their shafts at the same time. Fig. ...

HL-3450CN SERVICE MANUAL 7-17 4.1.9 Ozone fan (OZFAN) (Cooling fan (OZ)) (1) Remove the screws ST3x6 (3 pcs.) and BT4x8 (1 pc.) to remove the stay (R). (2) Remove the set screw ST3x6 (1 pc.) to remove the ozone fan case with the duct from the main frame. Fig. 7-17 (3) Remove the tape to remove the o...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-20 4.1.14 Developer drive unit 3 (1) Remove the set screw ST3x6 (1pc.) to remove the cover RF. (2) Release the harnesses from the harness holder. (3) Remove the developer drive gear for each color toner from the inside of the developer driver unit 3. (4) Rem...

HL-3450CN SERVICE MANUAL 7-23 4.2 Top of the Printer 4.2.1 Upper side cover (LU) (Upper side cover 3 (L)) (1) Open the top cover. (2) Remove the set screw BT4x10 securing the upper side cover (LU). (3) Press the exterior of the side cover 3 inwards and unlock the hooks (three locations) from the upp...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-26 4.2.5 Upper cover (Top cover 3) (1) Open the front cover and release the belt cartridge lock levers. (2) Remove the side cover 3 (R). (Refer to subsection 4.1.1 in this chapter.) (3) Remove the set screws BT4x10 (2 pcs.) securing the upper cover. (Top x 1...

HL-3450CN SERVICE MANUAL 7-29 4.2.9 Belt sensor (PBS) (1) Remove the set screws ST3x6 (1 pc.) to remove the belt sensor base from the main frame. (2) Disconnect the connector (1 pc.) to the belt sensor. (3) Release the catches to remove the belt sensor from the base. Fig. 7-39 4.2.10 Transfer drum 3...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-30 NOTE: x For easier removal, push the drum upwards and diagonally forwards. x When re-assembling the transfer drum 3, slide the drum shaft between the metal plates and ensure the drum is fully located into the correct retaining position. PRECAUTION Do not ...

HL-3450CN SERVICE MANUAL 7-31 4.2.12 Drum jam sensor (DPJ) (1) Release the catches and remove the cover F. (2) Disconnect the drum jam sensor connector. (3) Remove the drum jam sensor. NOTE: The dram jam sensor (DPJ ) is identical to the belt sensor (PBS). Fig. 7-43 4.2.13 Oil sensor (OIL) (1) Remov...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-32 4.3 Left Side of the Printer 4.3.1 Video Controller PCB CAUTION x Turn off the printer power switch and unplug the power cable from the outlet. x Remove the interface cable connector. (1) Remove the two screws to remove the main controller board from the ...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-34 4.3.2 MCTL PWB CAUTION Remove the Main (Video Controller) PWB before starting this disassembly. (1) Remove the set screw ST3x6 (1 pc.) from shield cover ‘B’. Slide the cover upwards and remove it. (2) Disconnect all the harness connectors (7 pcs.) connect...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-36 CAUTION When disconnecting the connector from the CBV terminal, push both sides of the connector. Pulling it hard may cause connector damage. WARNING The high voltage power supply unit generates high voltages of up to 5KV. You can get an electric shock if...

HL-3450CN SERVICE MANUAL 7-37 4.3.5 Drum encoder sensor (PS4) (1) Remove the sensor case assembly from the frame (L) by releasing the two catches. (2) Disconnect the connector (1 pc.) to the encoder sensor. (3) Remove the drum encoder sensor from the sensor case. Fig. 7-52 4.3.6 Fuser connector 3 (1...

HL-3450CN SERVICE MANUAL 7-39 (4) Remove the set screw ST3x6 (2 pcs.) holding the power inlet base. (5) Remove the set screw M4x6 complete with the shakeproof washer to release the ground wire. Fig. 7-56 (6) Disconnect the connectors (4 pcs.) from the low-voltage power supply PCB. (7) Remove the set...

HL-3450CN SERVICE MANUAL 7-41 4.3.10 Toner key sensor (TNK) (1) Remove the set screws ST3x6 (4 pcs.) from the toner key sensor PCB. (2) Disconnect the connector (1 pc.) connected to the IOD1 PWB. (3) Remove the toner key sensor PCB. Fig. 7-59 4.3.11 Toner sensor (TTR) (1) Remove the set screw ST3x6 ...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-42 4.4 Paper Exit Unit 4.4.1 Rear cover 3 (U) (1) Remove the rear cover 3 (R). (Refer to subsection 4.3.6 in this chapter.) (2) Release the two hooks to remove the rear cover 3 (U). (3) Remove the rear cover (U) caps (2 pcs.) from the rear cover 3 (U) if nec...

HL-3450CN SERVICE MANUAL 7-45 4.4.5 Paper exit sensor (PS2) (1) Disconnect the harness connected to the paper exit sensor. (2) Remove the paper exit sensor from the sensor base. Fig. 7-67 NOTE: When re-assembling the cleaning roller sensor and paper exit sensor, be sure to connect the correct harnes...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-46 4.4.7 Paper exit roller 3 (1) Remove the set screw ST3x6 (1 pc.) to remove the plastic retainer from the paper exit guide. (2) Remove the C ring and washer from the left and right hand sides of the roller. (3) Remove the plastic bush at both sides. (4) Re...

HL-3450CN SERVICE MANUAL 7-47 4.5 Front of the Printer 4.5.1 Front outer cover (Front cover 3) (1) Open the front cover unit 3. (2) Remove the set screws BT4x10 (2 pcs.) from the front cover unit 3. (3) Unhook the five hooks and remove the front outer cover. Fig. 7-70 4.5.2 Front cover unit 3 (1) Cl...

HL-3450CN SERVICE MANUAL 7-49 4.5.3 Laser unit (Scanner motor inclusive) (Optical unit 3) (1) Remove the set screws ST3x6 (2 pcs.) to remove the scanner cover. (2) Remove the fixing screws with flanges FST3x10 (3 pcs.) from the laser unit. (3) Disconnect the harness connector (1 pc.) from the laser ...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-50 4.6 Rear of the Printer 4.6.1 Rear access cover (TR unit cover 3) / Transfer unit 3 (1) Open the rear access cover. (2) Remove the fixing screw BT4x10 (1 pc.) of the retaining strap supporting the transfer unit 3 to the printer body. (3) Take the transfer...

HL-3450CN SERVICE MANUAL 7-51 4.6.2 Transfer roller 3 (1) Lift the transfer roller 3 lock levers to release both ends of the roller. (2) Pull up and remove the transfer roller 3. Fig. 7-77 4.6.3 Register roller (1) Remove the roller fixing C rings from both ends of the roller. (2) Remove the gear fr...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-52 4.6.4 Paper size sensor 3 (PSU) (1) Remove the set screws ST3x6 (2 pcs.) to remove the lower paper guide. (2) Remove the set screws ST3x6 (2 pcs.) holding the paper size sensor PCB. (3) Disconnect the paper size sensor connector, and remove the paper size...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-54 4.6.7 Paper feeding sensor (PS1) (1) Remove the paper feeding sensor from the rear frame. (2) Disconnect the connector on the paper feeding sensor. Fig. 7-83 4.7 Fusing Unit DANGER Note in Parts Replacement x The fusing unit consists of important safety p...

CHAPTER 7 DISASSEMBLY & RE-ASSEMBLY 7-56 4.7.3 Fusing heater lamp (Fusing heater 3 (US)(EC)) (1) Remove the fixing screw ST3x6 (2 pcs.) and slide the F cover (B) to the right to remove it. (2) Remove the fixing screws with washer M3x6 (2 pc.) from securing the two heater harnesses. (1st and 3rd ...

HL-3450CN SERVICE MANUAL 8-3 CHAPTER 8 TROUBLESHOOTING This chapter contains troubleshooting information for both the Video Controller Mode and the Engine Controller Mode. If any problem occurs during the normal usage of the printer, which means the printer is being used in the Video Controller Mode...

CHAPTER 8 TROUBLESHOOTING 8-4 1. OUTLINE OF TROUBLESHOOTING Printer Problem Operator Call Paper Transport Error Service Call Image Failure [Section 2.1] [Section 2 & 3] [Section 5] Turn off the power, hold down the Secure Print, Back and Set buttons and then turn the main switch on again. Turn o...

HL-3450CN SERVICE MANUAL 8-5 2. OPERATOR CALL 2.1 Video Controller Mode The Power LED is lit and an applicable message appears on the liquid crystal display (LCD) in the following cases; 1) Consumables require to be replenished. 2) Waste toner pack is full of waste toner. 3) Paper jam. 4) Periodic m...

CHAPTER 8 TROUBLESHOOTING 8-8 2.2 Engine Controller Mode The Power LED is lit, and applicable messages appear on the liquid crystal display (LCD) in the following cases; 1) Consumables require to be replenished. 2) Waste toner pack is full of waste toner. 3) Paper jam. 4) Periodic maintenance. 5) Ma...

CHAPTER 8 TROUBLESHOOTING 8-10 3. PAPER TRANSPORT ERROR Paper is transported through the path shown in Fig.8-1. Paper jams at the following locations are easily cleared. x Paper Feeding Roller x Fusing Unit x Transfer Unit x Paper Exit Unit Fig. 8-1 3.1 Feed Jam Table 8-3 Problem Item Step Check Ite...

HL-3450CN SERVICE MANUAL 8-11 3.2 Inner Jam Table 8-4 Problem Item Step Check Item Result Action Open the transfer unit and check. 1 Is there any paper inside the unit? YES Remove the paper inside. 2 Is the transfer roller firmly locked by the lock lever? NO Fix the transfer roller with the lock lev...

CHAPTER 8 TROUBLESHOOTING 8-12 (6) Remove the oil sensor cover. Fig. 8-3 (7) Pushing up the installation claw toward the engine, remove the paper guide. Fig. 8-4 Oil sensor cover Paper guide Paper guide

CHAPTER 8 TROUBLESHOOTING 8-14 4. SERVICE CALL If errors or failures occurred inside the printer, the applicable error message will be displayed on the control panel, and the printer stops. If errors or failures repeat even after resetting the power button, confirm the error code and then refer to t...

HL-3450CN SERVICE MANUAL 8-23 Error Code Name of Part Developer Clutch (DCLM) D2 Confirm the connection of Connector. Is the connection proper between ECN15 of IOD2 and Clutch (DCLM) ? Is the harness of Clutch (DCLM) broken ? Check the voltage at DCLM ON-N. Is D2 Error cleared ? Connect the harness....

CHAPTER 8 TROUBLESHOOTING 8-24 Error Code Name of Part Developer Clutch (DCLC) D3 Confirm the connection of Connector. Is the connection proper between ECN16 of IOD2 and Clutch (DCLC) ? Is the harness of Clutch (DCLC) broken ? Check the voltage at DCLC ON-N. Complete Is D3 Error cleared ? Connect th...

HL-3450CN SERVICE MANUAL 8-25 Error Code Name of Part Developer Clutch (DCLK) D4 Confirm the connection of Connector. Is the connection proper between ECN13 of IOD2 and Clutch (DCLK) ? Is the harness of Clutch (DCLK) broken ? Check the voltage at DCLK ON-N. Complete Is D4 Error cleared ? Connect the...

CHAPTER 8 TROUBLESHOOTING 8-26 Error Code Name of Part Developer Solenoid (PSL KY) D5 Confirm the connection of Connector. Is the connection proper between ECN3 of IOD2 and Solenoid (PSL YM) ? Is the harness of Solenoid (PSL KY) broken ? Check the voltage at (PSL YM) ON-N. Complete Is D5 Error clear...

HL-3450CN SERVICE MANUAL 8-27 Error Code Name of Part Developer Solenoid (PSL MC) D6 Confirm the connection of Connector. Is the connection proper between ECN3 of IOD2 and Solenoid (PSL KC) ? Is the harness of Solenoid (PSL KC) broken ? Check the voltage at (PSL KC) ON-N. Complete Is D6 Error cleare...

CHAPTER 8 TROUBLESHOOTING 8-28 Error Code Concerned Part Developer Motor(DM) E1 Is there any unusual rotation noise while printing ? Confirm the connection of connector. Is DCN9 of IOD1 properly connected with connector of DM1? Is DCN1 of IOD1 properly connected with 11CN of MCTL? Check the voltage:...

HL-3450CN SERVICE MANUAL 8-29 Error Code Concerned Part Main Motor(MM) E2 Does a belt cartridge rotate lightly ? Confirm the connection of connector. Is ECN12 of IOD2 properly connected with connector of DM1 ? Is ECN2 of IOD2 properly connected with DCN10 of IOD1 ? Is ECN1 of IOD2 properly connected...

HL-3450CN SERVICE MANUAL 8-31 Error Code Concerned Part Toner Sensor PCB.(LED side) E4 Confirm the connection of a toner sensor PCB.(LED side) connector. Check the voltage(LEDON-N/P) Is a signal voltage between DCN7-7 and 9 to be a rising edge(+24V) ? Is a signal voltage between DCN1-15 and 41 to be...

CHAPTER 8 TROUBLESHOOTING 8-32 Error Code Concerned Part Transfer Cam Clutch (TRCM) E5 Confirm the connection of a transfer solenoid connector. Is ECN8 of IOD2 properly connected with a connector of the solenoid ? Is ECN1 of IOD2 properly connected with 12CN of MCTL PWB ? Check the voltage(TRSLON-N/...

HL-3450CN SERVICE MANUAL 8-33 Error Code Concerned Part Cleaning Brush Solenoid (FBCM) E6 Confirm the connection of a cleaning brush solenoid connector. Is ECN10 of IOD2 properly connected with a connector of the solenoid ? Is ECN1 of IOD2 properly connected with 11CN of MCTL PWB ? Check the voltage...

CHAPTER 8 TROUBLESHOOTING 8-34 Error Code Concerned Part Cleaner Clutch E7 Confirm the connection of a cleaner clutch connector. Is ECN11 of IOD2 properly connected with a connector of the clutch ? Is ECN2 of IOD2 properly connected with DCN10 of IOD1 ? Is ECN1 of IOD1 properly connected with 11CN o...

CHAPTER 8 TROUBLESHOOTING 8-36 Error Code Concerned Part Belt Sensor (PBS) E9 Is a belt cartridge leaned to one side ? Confirm the connection of connector. Is DCN16 of IOD1 properly connected with a connector of the sensor ? Is DCN1 of IOD1 properly connected with 11CN of MCTL PWB ? Check the voltag...

CHAPTER 8 TROUBLESHOOTING 8-38 Error Code Concerned Part Fan Motor (Control Cooling) F0 Confirm the connection of a fan motor connector. Is DCN18 of IOD1 properly connected with a connector of the fan motor ? Is DCN1 of IOD1 properly connected with 11CN of MCTL PWB ? Check the voltage (CTFANON-P) Is...

HL-3450CN SERVICE MANUAL 8-43 Error Code Concerned Part Fusing Unit and Others H2,H3,H4 Confirm that a fusing heater is lit. Is the fusing heater controlled for On/Off. Is the line voltage to be the default value ? Is the rating of fusing heater correct ? Are H2,H3 and H4 errors cleared ? Are H2,H3 ...

HL-3450CN SERVICE MANUAL 8-47 5. IMAGE FAILURE (1) (2) (3) (4) (5) (6) (7) (8) (9)-a (9)-b (10) (11) (12) (13) (14)

HL-3450CN SERVICE MANUAL 8-49 I-1 Background Phenomenon Background is smeared due to toner spread as shown in print sample (1) of Page 8-45 . Main Causes (1) Too small toner mass and charging level in the developing process. (2) Poor contact of the developer roller’s bias pole. (3) Life expired or f...

CHAPTER 8 TROUBLESHOOTING 8-54 I-9 Black Line / Blur in the Image Phenomenon Fine black line or blur appears in the printed image as shown in print sample (9) of Page 8- 45 . Main Causes (1) The corona wire of the paper discharger unit is dirty. (2) OPC belt surface is damaged. (3) Foreign particles...

HL-3450CN SERVICE MANUAL 8-55 I-11 Vertically Staggered Image Phenomenon Printed image staggered in the vertical direction as shown in print sample (11) of Page 8-45 . Main Causes (1) Shock or vibration applied to the printer. (2) Failure of the laser unit; vibration from rotation of the scanner mot...

CHAPTER 8 TROUBLESHOOTING 8-58 I-15 W hite Spot / Black Spot Phenomenon W hite spots and black spots appear on the print as shown in print sample (15) of Page 8-46 . Main Causes (1) Foreign particles adhering to the OPC belt or transfer drum. (2) The OPC belt or transfer drum is damaged. (3) Foreign...

CHAPTER 8 TROUBLESHOOTING 8-60 I-19 Mottle Phenomenon Variation of the scanning density is found in the image as shown in print sample (19) of Page 8-46 . Main Causes (1) The transfer unit is not fixed in place. (2) Assembly of the transfer roller is inaccurate. (3) THV output of the high-voltage po...

CHAPTER 8 TROUBLESHOOTING 8-64 I-27 Color Missing Phenomenon Color is missing in the printed image as shown in print sample (27) of Page 8-46 . Main Causes Fusing failure due to using damp paper or using the printer under high humidity conditions. Countermeasures (1) Use the paper immediately after ...

HL-3450CN SERVICE MANUAL A-1 APPENDIX 1. SERIAL NO. DESCRIPTIONS The descriptions as below show how to read labels fitted to the printer parts. < ID for production month of the Printer > A: January E: May J: September B: February F: June K: October C: March G: July L: November D: April H: Augu...

APPENDIX A-2 (2) Toner Cartridge BR 1 2 2 1 1 X X X X X X X <Location> Fig. A- 2 NOTE: There are two seals on each toner cartridge. On the starter toner, there is a “S” written at the beginning of the first seal. Toner cartridges of accessories have “BR” written as the above. (3) OPC Belt Cart...

HL-3450CN SERVICE MANUAL A-3 (4) Toner Cartridge, OPC Belt Cartridge Master Box X X X X - X X X (5) Fusing Unit X X X X X X X X X *1-9 and X for Oct., Y for Nov., Z for Dec. <Location> Fig. A- 4 1 ST LOT MONTH OF TONER/BELT 2 ND LOT OF MONTH OF TONER CARTRIDGE /BELT CARTRIDGE 1 ST LOT OF MONTH...

APPENDIX A-4 (6) Laser Unit X X X X X *1-9 and X for Oct., Y for Nov., Z for Dec. <Location> Fig. A- 5 (7) Transfer Drum X X X X X X X X X X *1-9 and X for Oct., Y for Nov., Z for Dec. <Location> Fig. A- 6 REV DATE DATE *MONTH *MONTH YEAR FACTORY USE YEAR

HL-3450CN SERVICE MANUAL A-5 (8) Power Supply Unit S/N X X X X X X X REV X X YY/WW X X / X X <Location> Fig. A- 7 FACTORY USE WEEK OF YEAR YEAR OF POWER SUPPLY UNIT

APPENDIX A-6 APPENDIX 2. DIAMETER / CIRCUMFERENCE OF ROLLERS The diameter or circumference of each roller is listed below; No. Parts Name Diameter (Circumference) 1 OPC Belt (509 mm) 2 Belt Drive Roller I 32.4 mm (101.74 mm) 3 Developer Roller I 22 mm (69.80 mm) 4 Transfer Roller I 25 mm (78.5 mm) 5...

HL-3450CN SERVICE MANUAL A-7 APPENDIX 3. SHELF LIFE OF EACH CONSUMABLE Each consumable has its own shelf life as follows. Shelf life varies depending whether the consumable packaging is open or not. Consumable Before unpacking *1 After unpacking *2 Toner cartridge (all colors) 3 years 1 year OPC bel...

APPENDIX A-8 APPENDIX 4. CONSUMABLES REPLACEMENT Each consumable below should be replaced according its own life. 1) Toner Cartridge Life: K = 14,000 prints, CYM = 8,500 pritns Condition: Above figures are based on A4 or letter size 5% coverage. Life is detected by the toner empty sensor. NOTE: Life...

APPENDIX A-10 Modified by the additional life deleted figure <40,000> 1) No change 2) 10 pages <39,990> 2) 10 pages <20> 1) 10 pages <10> <0> Total page counter life Figure from <Next care information 32> This difference is the actual life remaining 1) Print 10 pa...

HL-3450CN SERVICE MANUAL A-11 APPENDIX 5. HOW TO RE-ENTER ORIGINAL DATA TO THE MCTL PWB CAUTION Actions 1) and 2) MUST be carried out BEFORE the MCTL PWB is removed or the NVRAM initialized otherwise ALL READINGS WILL BE LOST. 1) Go into the Engine Controller Mode. (Refer to Section 3 “ENGINE CONTRO...

APPENDIX A-14 APPENDIX 6. RE-PACKING INSTRUCTIONS PRECAUTION When re-packing the printer before shipping, be sure to follow the steps and cautions below. Failure to do so will cause toner or oil spill in the printer and severe damage to the printer. 6.1 Toner Cartridge 1) Open the front cover and re...

HL-3450CN SERVICE MANUAL A-15 6.2 OPC Belt Cartridge 1) Open the top cover and remove the OPC belt cartridge from the printer. 2) Open the shutter on the OPC belt cartridge and remove toner in the cartridge with a vacuum cleaner. Fig. A- 10 3) Cover the OPC belt cartridge with the original protectiv...

APPENDIX A-16 6.3 Fusing Unit 1) Remove the fusing unit securing screws (2 pcs.) Fig. A- 13 2) Holding the handles at both ends of the fusing unit and remove the fusing unit from the printer. 3) Remove the oil bottle and the fuser cleaner from the fusing unit and put each of them into the polyethyle...

HL-3450CN SERVICE MANUAL A-19 4) Paper cassette i) Remove the paper cassette from the printer and remove paper from the cassette. ii) Vacuum up any paper dust in the paper cassette. iii) Reinstall the paper cassette. Fig. A- 24 6.6 Packing 1) Re-install the fusing unit into the printer. i) After set...

APPENDIX A-20 4) Pack the printer, starter kit packing, waste toner pack, and power cable in the carton using the original packing material. Fig. A- 27 5) Seal the outer carton firmly. 6) Band the carton with two plastic bands. Fig. A- 28 Starter kit packing Outer carton Power cable Printer Waste to...

HL-3450CN SERVICE MANUAL A-21 APPENDIX 7. HIDDEN FUNCTION MENU 7.1 Line Test Menu Hold down the + and - buttons and turn the print ON LINE TEST ----- < Press the Go button > Item Descriptions 1 LCD TEST All columns of the LCD are turned on to check that the LCDs are all displayed correctly. 2 ...

APPENDIX A-22 7.2 Professional Menu The professional menu is open to users as per request to customize the printer functions mainly. To enter the professional menu, press the Go and Set buttons together. The details for each menu are described as follows; T R A Y S E T T I N G TRAY PRIORITY ----- T1...

APPENDIX A-24 T R A Y C O M M A N D M O D E Makes the command to select the paper source compatible with HP LaserJet 3. TRAY COM. = NORM * HP LaserJet 4 command TRAY COM. = SPEC. HP LaserJet 3 command R E A D O U T S E L E C T Specifies that the printer reads DC3 in the FX emulation or not. READOUT ...

APPENDIX A-28 P A P E R & T R A Y S I Z E Specifies the default paper size. DEF PAPER =LT The default paper size is letter for the US and Canada models. DEF PAPER =A4 The default paper size is A4 for the other models. P A R A L L E L M E N U Changes the signal timing of the Centronics interface ...

APPENDIX A-30 P R O T E C T O F F M O D E Specifies the performance of the page protection function. PRO.OFF = AUTO* Protects the data spuriously even when the page protection is turned off. (Countermeasure for the memory full or print overrun error.) PRO.OFF = NORMAL Specification up to the 4 th ma...

APPENDIX A-32 7.3 Reset Parts Life The Reset parts life menu is implemented when the service personnel replaces the periodic maintenance parts. For the parts to be replaced easily, however, it is assumed that the user replaces them by him/herself. Therefore the reset parts life menu is distinguished...

HL-3450CN SERVICE MANUAL A-33 7.4 Service Menu The service menu provides the printer information for the service personnel. (The following descriptions are not open to other than the service personnel.) To enter the service menu, press the + and Set buttons in this order while holding down the Go bu...

APPENDIX A-36 APPENDIX 8. TO LEVEL THE PRINTER CORRECTLY Please read the leveling instructions described below carefully. If the printer is not installed level, image failures may occur or the life expectancy of the OPC belt cartridge may be shortened. Please do not install the printer as shown in t...

HL-3450CN SERVICE MANUAL A-37 iii) The table the printer is installed on is not level. Fig. A- 31 iv) The table surface the printer is installed on is not strong enough. Fig. A- 32 NOTE: If you have a spirit level, put it on the output tray and install the printer as level as possible referring to t...

APPENDIX A-38 APPENDIX 9. PAPER POSITIONS DURING DUPLEX PRINTING Fig. A-34 below shows the paper positions when printing using the available duplex printing function. Fig. A- 34

HL-3450CN SERVICE MANUAL A-39 APPENDIX 10. HOW TO REWRITE HL-3450CN FLASH ROM Object parts: LJ8901001 MAIN PCB ASSY, HL3450CN Preparation tool *PC (W indows 98 or later) Create the folder “3450” in C drive. *1 HL-3450CN printer *1 parallel cable *FILEDG32.EXE Download “FILEDG32.EXE” from Utility DB,...