Brother Facsimile Equipment MFC7420- Manuals

iv Confidential CHAPTER 5 DISASSEMBLY/REASSEMBLY AND LUBRICATION 5.1 DISASSEMBLY/REASSEMBLY ............................................................................... 5-1 „ Safety Precautions ..........................................................................................................

v Confidential 5.1.24 Tail Edge Actuator .............................................................................................. 5-58 5.1.25 Regist Front Actuator/Regist Front Spring ......................................................... 5-58 5.1.26 Regist Sensor PCB ASSY ....................

vi Confidential CHAPTER 7 CLEANING CHAPTER 8 MAINTENANCE MODE 8.1 ENTRY INTO THE MAINTENANCE MODE ............................................................. 8-1 8.2 LIST OF MAINTENANCE MODE FUNCTIONS........................................................ 8-2 8.3 USER-ACCESS TO THE MAINTENANCE MO...

vii Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING 9.1 ERROR INDICATION ................................................................................................ 9-1 9.1.1 Equipment Errors ..............................................................................................

viii Confidential APPENDIX 6 CIRCUIT DIAGRAMS NCU PCB: MFC7420 (U.S.A. and CANADA models) NCU PCB: MFC7820N (U.S.A. and CANADA models) NCU PCB: MFC7420 (EUROPE models) NCU PCB: MFC7820N (EUROPE models) Power Supply PCB 100V (U.S.A. and CANADA models) Power Supply PCB 200V (EUROPE models)

Confidential ix SAFETY PRECAUTIONS To use the MFC safely Please keep these instructions for later reference and read them before attempting any maintenance. NOTE: If there are faxes in the MFC's memory, you need to print them or save them before you turn off the power and unplug the MFC. (For MFC-74...

Confidential x WARNING • When you move the MFC, grasp the side hand holds that are under the scanner. DO NOT carry the MFC by holding it at the bottom. • Use caution when installing or modifying telephone lines. Never touch telephone wires or terminals that are not insulated unless the telephone lin...

Confidential xi CHOOSING A LOCATION Place your MFC on a flat, stable surface that is free of vibration and shocks, such as a desk. Put the MFC near a telephone wall jack and a standard, grounded AC power outlet. Choose a location where the temperature remains between 50°F and 90.5°F (10°C and 32.5°C...

Confidential CHAPTER 1 PARTS NAMES & FUNCTIONS This chapter contains external views and names of components and describes their functions. Information about the keys on the control panel is included to help you check operation or make adjustments. CONTENTS 1.1 EQUIPMENT OUTLINE ....................

1 - 1 Confidential 1.1 EQUIPMENT OUTLINE Front view Rear view ADF Document Output Support Flap Document Cover Power Switch Front Cover Paper Tray Control Panel USB Interface Connector Parallel Interface Connector 10/100 Baser TX Port (MFC7820N only) AC Power Connector Back Cover Automatic Document F...

1 - 3 Confidential 5. Navigation Keys 11. Copy Keys (Temporary settings) Enlarge/Reduce Lets you reduce or enlarge copies depending upon the ratio you select. Options You can quickly and easily select temporary settings for copying. 12. Printer Key Menu/Set The same key is used for Menu and Set oper...

1 - 4 Confidential 1.3 COMPONENTS The equipment consists of the following major components: Scanner Unit Panel Unit Speaker ASSY Joint Cover ASSY Laser Unit Side Cover R PS PCB Unit Frame Unit Front Cover Paper Tray High-voltage PS PCB Side Cover L Main PCB Battery ASSY Fixing Unit Rear Cover Rear C...

Confidential CHAPTER 2 SPECIFICATIONS This chapter lists the specifications of each model, which enables you to make a comparison of different models. CONTENTS 2.1 GENERAL ........................................................................................................................ 2-1 2.1...

2 - 1 Confidential 2.1 GENERAL 2.1.1 General Specifications Memory Capacity 16 MB (MFC-7420), 32 MB (MFC-7820N) Automatic Document Feeder (ADF) Up to 35 sheets Paper Tray 250 Sheets (20 lb (75 g/m 2 )) Printer Type Laser Print Method Electrophotography by semiconductor laser beam scanning Liquid Cry...

2 - 4 Confidential 2.1.3 Printable Area When using PCL emulation, the edges of the paper that cannot be printed on are shown below. Portrait A B C D E F G F G E G G Physical page Printable area Logical page B Physical page length D Maximum logical page length F Distance from edge of physical page to...

2 - 5 Confidential The table below shows the printable areas when printing on Portrait for each paper size. Size A B C D E F G Letter 215.9 mm 8.5” (2,550 dots) 279.4 mm 11.0” (3,300 dots) 203.2 mm 8.0” (2,400 dots) 279.4 mm 11.0” (3,300 dots) 6.35 mm 0.25” (75 dots) 0 mm 4.2 mm 0.16” (50 dots) Lega...

2 - 6 Confidential Landscape A B C D E F G F G E G G Physical page Printable area Logical page B Physical page length D Maximum logical page length F Distance from edge of physical page to edge of logical page NOTE: • “Logical page” shows the printable area for a PCL driver. • “Printable area” shows...

2 - 8 Confidential 2.2 SPECIFICATIONS LIST MFC7420/7820N (1/15) US/Canada Europe Asia/Pacific US/Canada Europe Asia/Pacific Model Name GENERAL Print Engine CPU Speed Back up Clock Operating Environment Temperature Operating Environment Humidity On/Off Switch AC Cord inlet Demo Print Yes (US only) Ye...

Confidential 3 - 2 3.2 MECHANICAL COMPONENTS Pinch roller Drum/toner ASSY Paper feed roller Regist front actuator Pinch roller Separation roller Tail edge actuator Pressure roller Separation pad Feed roller Up plate Regist rear actuator Supply roller Developer roller Transfer roller Exposure drum Br...

Confidential 3 - 3 3.2.1 Scanner Mechanism This mechanism consists of the document cover, the scanner unit (scanner cover), and the automatic document feeder (ADF). The scanner unit consists of a scanner top cover, CIS unit, CIS drive assembly, and scanner base. The detailed illustration on the next...

Confidential 3 - 5 (1) ADF scanning: Document moves across stationary CIS unit Placing a document face up in the document support activates the document front sensor, switching to ADF scanning. The CIS drive mechanism (details below) operates for each scanning command executed. The CIS unit first mo...

Confidential 3 - 7 (1) The paper is gripped between the separation roller and separation pad and separated into individual sheets. The separation roller is connected to the gear 52 P/R. (2) The section of the gear 52 P/R, where there is no cog, is normally fixed at the position as shown in the figur...

Confidential 3 - 8 3.2.2.2 Push-up function of paper tray In order to improve the transfer function of the paper tray, the pressure plate in the paper tray is lifted up by the motor. (1) The pressure plate comes down while the recording paper tray is inserted into the machine. When the main motor ro...

Confidential 3 - 1 0 3.2.2.3 Paper registration After the paper top position is detected by the regist front actuator, the paper, separated into individual sheets by the separation roller, is fed further for a specified time, and the paper top position reaches the paper feed roller so that the paper...

Confidential 3 - 1 1 3.2.2.4 Paper eject After the printing image on the exposure drum is transferred onto the paper, the paper is fed to the fixing unit to fix unfixed toner onto the paper. Afterwards, the paper is ejected from the fixing unit by the heat roller and the pressure roller in the fixin...

Confidential 3 - 1 2 3.2.2.6 Toner cartridge Develops the electrostatic latent image on the exposure drum with toner and forms the visible image. „ Toner life end mode The life of the toner cartridge is starter: 1,500, standard: 2,500 pages at the 5% coverage. In the case of low- duty printing, “Ton...

Confidential 3 - 1 3 „ „ „ „ New toner detection mechanism The printer detects the amount of the remaining toner with the sensor and indicates the timing to replace the toner cartridge by displaying ‘Toner Life End’ on the LCD to the user. The problem such as toner leak or image defect may occur whe...

Confidential 3 - 1 4 When the new toner detection switch detects that the toner cartridge is replaced with a new one, the developing bias voltage is initialized at the same time. The toner used for the printer has a property that print density is light first and gradually darker in the course of usa...

Confidential 3 - 1 5 3.2.2.7 Print process „ „ „ „ Charging The drum is charged to approximately 900V by an ion charge which is generated by the primary charger. The charge is generated by ionization of the corona wire, which has a DC bias from the high-voltage power supply applied to it. The flow o...

Confidential 3 - 1 6 3. The laser beams reflected by the reflection mirror go straight toward the exposure drum below it, then expose the exposure drum. The area exposed to the laser beam is the image to be printed. The surface potential of the exposed area is reduced, forming the electrostatic imag...

Confidential 3 - 1 7 „ „ „ „ Transfer (1) Transfer process After the drum has been charged and exposed, and has received a developed image, the toner formed is transferred onto the paper by applying a negative charge to the back of the paper. The negative charge applied to the paper causes the posit...

Confidential 3 - 1 8 3.2.3 Sensors and Actuators Sensor name Sensor type Location Cover sensor Mechanical switch Main frame L Toner LED PCB (Light emission) Photo sensor Main frame R Toner sensor PCB (Light reception) Photo sensor Main frame L Paper eject sensor Photo sensor Main PCB Regist front se...

Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR

Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR This chapter describes how to transfer data left in the machine to be sent for repair. The service personnel should instruct end users to follow the transfer procedure given in this chapter if the machine at the user s...

Confidential 4 - 1 4.1 TRANSFERRING RECEIVED FAX DATA When the machine at the user site requires to be repaired, unplugging the power cord from the wall socket for sending the machine for repair will lose received FAX data if unprinted and left in the machine. To prevent such data loss, the service ...

Confidential 4 - 2 Cover page sample End page sample

Confidential CHAPTER 5 DISASSEMBLY/REASSEMBLY AND LUBRICATION

Confidential 5 - 1 5.1 DISASSEMBLY/REASSEMBLY Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) Before starting disassembly/reassembly jobs, unplug the power cord and telephone line. In particular, when hav...

Confidential 5 - 2 Tightening Torque Location of screw Screw type Q'ty Tightening torque N•m (kgf•cm) Side cover L Taptite, bind B M4x12 2 0.79 ± 0.1 (8 ± 1) Side cover R Taptite, bind B M4x12 2 0.79 ± 0.1 (8 ± 1) Ground wire Taptite, cup S M3x6 1 0.78 ± 0.1 (8 ± 1) Upper document chute Taptite, cup...

Confidential 5 - 3 Preparation Prior to proceeding with the disassembly procedure, (1) Unplug - the modular jack of the telephone line, - the USB cable, if connected (not shown below), and - the modular jack of the external telephone set if connected (not shown below). How to Access the Object Compo...

Confidential 5 - 4 Disassembly Flowchart 1 2 3 4 5 6 7 8 14 16 18 18 19 19 21 21 31 32 33 31 32 33 19 34 34 20 20 28 28 29 29 39 15 17 15 16 17 10 9 13 12 11 21 24 25 27 27 23 23 22 30 26 37 35 38 36 37 36 AC Cord Drum/Toner ASSY Paper Tray Rear Cover Rear Chute Cover Side Cover L Side Cover R Joint...

Confidential 5 - 5 5.1.1 AC Cord (1) Disconnect AC cord from the machine. 5.1.2 Drum/Toner ASSY (1) Open the front cover and remove the drum/toner ASSY. AC cord Drum/toner ASSY Machine Front cover

Confidential 5 - 6 5.1.3 Paper Tray (1) Close the front cover and pull out the paper tray. (2) Remove the paper from the paper tray. (3) Remove the separation pad holder ASSY and the separation pad spring. Separation pad holder ASSY Screwdriver Hooks Separation pad spring Separation pad holder ASSY ...

Confidential 5 - 7 5.1.4 Rear Cover (1) Remove the rear cover. NOTE : Remove the “A” section of the rear cover while opening the rear cover slightly. Pin “A” Rear cover Main frame R Boss Rear cover Rear cover

Confidential 5 - 8 5.1.5 Rear Chute Cover (1) Remove the rear chute cover. (2) Remove the paper eject actuator and the eject actuator spring. Boss Rear chute cover Rear chute cover Hook Paper eject actuator Rear chute cover Paper eject actuator Paper eject actuator Rear chute cover Paper eject actua...

Confidential 5 - 1 1 5.1.8 ADF unit (1) Open the ADF unit and scanner unit. (2) Remove the one cup S M3x6 taptite screw and ADF FG harness and FB FG harness. (3) Disconnect the two connectors of the ADF unit from the main PCB. (4) Disconnect the two connectors of the scanner unit from the main PCB. ...

Confidential 5 - 1 3 (9) Remove the two pressure rollers from the pressure roller shaft. (10) Open the ADF unit. (11) Release the hook to remove the gear cover from the ADF unit. Pressure roller shaft Pressure roller Hook Gear cover Gear cover ADF unit

Confidential 5 - 1 4 (12) Close the ADF unit. (13) Remove the separate roller shaft ASSY and bushing from the ADF unit. (14) Remove the four cup B M3x10 taptite screws. (15) Release the three hooks “A” to remove the upper document chute. Separate roller shaft ASSY ADF unit Taptite, cup B M3x10 Hook ...

Confidential 5 - 1 5 (16) Remove the separation rubber ASSY from the upper document chute. (17) Remove the separation rubber from the ADF plate spring. Separation rubber ASSY “A” “A” Upper document chute Hook Hooks ADF plate spring 1 2 3 Separation rubber ADF plate spring

Confidential 5 - 1 6 (18) Remove the two cup B M3x10 taptite screws from the lower document chute. (19) Release the two hooks to remove the lower document chute. NOTE : When re-connecting the connectors, put them through the holes on the ADF unit before connecting . (20) Release the hook on the ADF ...

Confidential 5 - 1 7 (21) Remove the two ejection rollers from the pressure roller shaft. (22) Remove the ADF unit ejection spring from the ADF unit. Pressure roller shaft Ejection roller Ejection roller ADF unit ejection spring ADF unit

Confidential 5 - 1 8 (23) Release the two hooks and remove the resin bearing. (24) Remove the LF roller ASSY from the lower document chute. (25) Release the two hooks “A” and remove the the ejection roller ASSY from the lower document chute. (26) Release the two hooks “B” and remove the ejection rol...

Confidential 5 - 1 9 (27) Remove the two cup B M3x10 taptite screws and one cup S M3x6 taptite screw from the lower document chute. (28) Remove the drive frame ASSY from the lower document chute. (29) Remove the one bind S M3x6 taptite screw from the drive frame ASSY to remove the ADF motor. (30) Re...

Confidential 5 - 2 2 (35) Turn the lower document chute upside down. (36) Remove the pins and remove the document hold. (37) Remove the document spring from the lower document chute. (38) Open the ADF unit. (39) Remove the one bind B M4x12 taptite screw from the document cover sub ASSY. (40) Release...

Confidential 5 - 2 3 (41) Remove the two springs. (42) Remove the pressure roller ASSY. (43) Remove the two pressure rollers from the pressure roller shaft. Pressure roller shaft Pressure rollers Pressure roller ASSY Spring Spring Document cover sub ASSY

Confidential 5 - 2 4 (44) Remove the three cup B M3x10 taptite screws to remove the hinge ASSY L. (45) Remove the hinge from the hinge arm. (46) Remove the one bind B M4x12 taptite screw to remove the hinge arm. Document cover sub ASSY Hinge ASSY L Taptite, cup B M3x10 Hinge arm Hinge Taptite, bind ...

Confidential 5 - 2 6 5.1.10 Scanner Unit (1) Disconnect the flat cable from the main PCB. (2) Remove the scanner unit from the machine. 5.1.11 Panel Unit (1) Remove the four cup B M3x10 taptite screws from the scanner unit. (2) Release the four hooks. Flat cable Machine Scanner unit Hooks Hooks Pane...

Confidential 5 - 2 8 (7) Remove the rubber key. NOTE : When re-assembling the rubber key, make sure that the key works correctly. (8) Release the two hooks “A” to remove the backlight guide. Rubber key Panel cover Bosses Bosses Bosses Bosses Backlight guide Hook “A” Hook Hooks “A” Hooks Boss Panel c...

Confidential 5 - 3 1 (3) Remove the NCU harness ASSY. (4) Remove the two cup S M3x6 taptite screws from the NCU shield cover to remove the NCU PCB ASSY. 5.1.13 Speaker (1) Disconnect the connector of the speaker from the main PCB. NCU shield cover NCU PCB ASSY NCU harness ASSY Taptite, cup S M3x6 1 ...

Confidential 5 - 3 2 (2) Release the three hooks to remove the speaker cover. (3) Release the one hook to remove the speaker hold spring. Speaker cover Hooks Hook 1 2 3 4 4 1 2 2 Hook Speaker hold spring Hook Machine Machine Speaker hold spring

Confidential 5 - 3 5 (4) Remove the battery ASSY and disconnect the connector. CAUTION : • There is a danger of explosion if the battery is incorrectly replaced. • Do not replace the battery. • Do not disassemble, recharge or dispose of in fire. • Used battery should be disposed of according to loca...

Confidential 5 - 3 6 5.1.15 Front Cover (1) Release the hook of the drive release cam from the front cover ASSY. (2) Release the hook “A” on the front cover ASSY from the chute. (3) Slide the front cover ASSY to the direction of the arrow shown in the figure below to remove it. Hook Front cover ASSY...

Confidential 5 - 4 1 (7) Remove the link lever from the hook of the pickup roller holder ASSY. (8) Remove the pickup roller holder ASSY. NOTE : The pickup roller holder spring is assembled on the bottom of the pickup roller holder ASSY. Be careful not to lose the spring. Pickup roller holder ASSY Ch...

Confidential 5 - 4 2 5.1.17 Fixing Unit (1) Disconnect the heater harness connector and thermistor harness connector. (2) Remove the two cup B M4x12 taptite screws, and then remove fixing unit. NOTE : Be sure not to touch the pressure roller. (3) Remove the two PR spring. (4) Remove the pressure rol...

Confidential 5 - 4 3 (5) Remove the two PR arm ASSY and two PR bush from the pressure roller. (6) Release each hook of the springs from the fuser frame and remove the four separate claw ASSYs. NOTE : Be careful not to damage the heat roller when removing the separate claw ASSY. PR arm ASSY PR bush P...

Confidential 5 - 4 5 NOTE : When re-assembling the heat roller, assemble the HR bush onto the fuser frame referring to the figure below. NOTE : When re-assembling the halogen heater, put the halogen heater onto the fuser frame so that the terminal of the heater harness is at the top, and secure the ...

Confidential 5 - 4 6 (10) Remove the HR gear. (11) Remove the two HR bush. (12) Remove the thermistor ASSY harness from the four hooks. (13) Remove the cup B M3x12 taptite screw, and then remove the thermistor ASSY. Heat roller HR bush Hooks HR bush HR gear Return the hook to the original position. ...

Confidential 5 - 4 7 NOTE : When re-assembling the thermistor ASSY to the fuser frame, ensure the direction of the thermistor ASSY is correct referring to the figure below; Fuser frame Heat roller Thermistor ASSY Taptite, cup B M3x12

Confidential 5 - 4 9 5.1.19 Main PCB < DCP7010/7020/7025, MFC7420 > (1) Disconnect the thirteen connectors from the main PCB.   (2) Remove the five cup S M3x6 taptite screws and FG harness ASSY 6. (3) Remove the two flat S M3x8 taptite screws. (4) Remove the main PCB from main frame L. NOTE : ...

Confidential 5 - 5 1 5.1.20 PS PCB Unit (1) Remove the duct film. (2) Remove the pan (S/P washer) M3.5 x 6 screw and FG harness ASSY 1. (3) Remove the pan (S/P washer) M3.5 x 6 screws and FG harness ASSY 5. (4) Remove the pan (S/P washer) M3.5 x 6 screws and NCU FG harness. (5) Remove the two cup S ...

Confidential 5 - 5 3 (11) Remove the two cup S M3x6 taptite screws. (12) Disconnect the three connectors from the PS PCB unit, and then remove the PS PCB unit. NOTE : When disconnecting the connectors, disconnect the regist sensor PCB connector and toner LED PCB unit ASSY connector first, lift up th...

Confidential 5 - 5 7 5.1.23 Link Lever (1) Turn the printer body upside down. (2) Pull the “A” section outwards and remove the link lever. NOTE : When re-assembling the link lever, insert the end of the link lever into the main frame L referring to the figure below. Link lever “A” Printer top side(P...

Confidential 5 - 5 8 5.1.24 Tail Edge Actuator (1) Remove the tail edge actuator with the tail edge spring. (2) Remove the tail edge spring from the tail edge actuator. 5.1.25 Regist Front Actuator/Regist Front Spring (1) Remove the regist front actuator with the regist front spring. (2) Remove the ...

Confidential 5 - 6 5 5.1.35 Develop Joint (1) Remove the develop joint from the gear plate calking ASSY. 5.1.36 P/R Solenoid ASSY (1) Remove the bind B M3x10, taptite screw. (2) Remove the P/R solenoid ASSY, the P/R solenoid lever and the solenoid release spring P/R. P/R solenoid lever Solenoid rele...

Confidential 5 - 6 6 5.1.37 F/R Solenoid ASSY (1) Remove the gear ASSY from the main frame L. NOTE : The gear ASSY contains the small gears. Be careful not to lose them by disassembling the gear ASSY. Gear ASSY Main frame L Gear 40/54 F/R Gear 45 arm F/R Gear 17 planetary F/R Gear center F/R

Confidential 5 - 7 0 5.1.40 Harness Routing Laser unit 1 FG harness ASSY 1 / FG harness ASSY 5 2 Laser unit LD harness 5P Polygon motor connector FG harness ASSY 1 FG harness ASSY 1 FG harness ASSY 5 FG harness ASSY 5 Adhesion tape Hole Hole Hole Chute Binder Toner LED PCB harness Regist sensor PCB ...

Confidential 5 - 7 1 Laser unit FG harness ASSY 6 3 Regist sensor PCB ASSY 4 FG harness ASSY 6 Hole Hole Hook Rib Rib Hook Main PCB Chute Regist sensor PCB ASSY PS PCB unit Printer top side(Printer body upside down)

Confidential 5 - 7 2 Fan motor 60 unit Fan motor 60 unit Toner LED PCB ASSY PS PCB unit Hole Hole Hole Hole Hooks Main PCB Hook Hook Hooks Printer top side(Printer body upside down) 5 Toner LED PCB ASSY 6 Binder FG harness ASSY 5 Regist sensor PCB harness

Confidential 5 - 7 3 Toner sensor PCB ASSY 7 P/R solenoid ASSY / F/R solenoid ASSY 8 Hook Hook Hook High-voltage PS PCB ASSY High-voltage PS PCB ASSY F/R solenoid ASSY P/R solenoid ASSY Toner sensor PCB ASSY

Confidential 5 - 7 4 New toner sensor / Cover sensor / Battery harness 9 10 Panel unit Cover sensor New toner sensor Holes Hole Hook Hook Panel PCB Panel unit Document scanner Hook Hooks Hole Main PCB Main PCB Battery harness Rib

Confidential 5 - 7 5 ADF unit 11 Document scanner 12 Hooks Hole Hole Hole Hole Hole Hole ADF motor ADF sensor PCB ADF unit Documentscanner Document scanner ADF FG harness FB FG harness FB motor harness FFC CIS harness Joint cover ASSY Joint cover ASSY Main PCB Main PCB

Confidential 5 - 7 6 NCU FG harness NCU PCB 13 NCU PCB Hole Main PCB NCU FG harness 14 NCU unit Hole LV shield unit NCU FG harness Joint cover ASSY

Confidential 5 - 7 7 15 Speaker ASSY Hook Hook Hook Ribs Rib Rib Speaker ASSY Front Main PCB Main PCB Joint cover ASSY Joint cover ASSY

Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS, REQUIRED AFTER PARTS REPLACEMENT

Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS, REQUIRED AFTER PARTS REPLACEMENT This chapter details adjustments and updating of settings, which are required if main PCB and some other parts have been replaced. CONTENTS 6.1 IF YOU REPLACE THE MAIN PCB .....................................

6 - 1 Confidential 6.1 IF YOU REPLACE THE MAIN PCB [ 1 ] Load update programs/data If the main PCB is replaced with a new one, write the update programs/data onto the flash ROM. Refer to Appendix 2, page App. 2-2. [ 2 ] Initialize the EEPROM on the main PCB (Function code 01) Refer to Chapter 8, Sec...

6 - 2 Confidential 6.2 IF YOU REPLACE THE LASER SCANNER UNIT ASSY [ 1 ] Inputting the adjusted value of the laser scanner (1) Double-click the brmainte.EXE file (maintenance utility). (2) Select Input Information from Menu. Select the applicable model name. (3) Check the port (USB) which the machine...

Confidential CHAPTER 8 MAINTENANCE MODE This chapter describes the maintenance mode which is exclusively designed for the purpose of checks, settings and adjustments using the keys on the control panel. You can customize the EEPROM according to the shipment destination of the machine concerned. In a...

8 - 1 Confidential 8.1 ENTRY INTO THE MAINTENANCE MODE MFC7420/7820N Press the Menu/Set and Start keys. Next press the key four times to make the machine enter the maintenance mode. TIP: FAX models equipped with numerical keypads can enter the maintenance mode in the same way as conventional models;...

8 - 2 Confidential 8.2 LIST OF MAINTENANCE-MODE FUNCTIONS Maintenance-mode Functions Function Code Function Reference Section (Page) 01 EEPROM Parameter Initialization 8.4.1 (8-5) 05 Printout of Scanning Compensation Data 8.4.2 (8-6) 06 Placement of CIS Unit Position for Transportation 8.4.3 (8-8) 0...

8 - 3 Confidential 8.3 USER-ACCESS TO THE MAINTENANCE MODE Basically, the maintenance-mode functions listed on the previous page should be accessed by service personnel only. However, you can allow end users to access some of these under the guidance of service personnel (e.g., by telephone). The us...

8 - 4 Confidential DCP7010/7020/7025 (1) Press the Menu , Start , Menu, and keys in this order. The "MAINTENANCE **" appears on the LCD. (2) Press the Start key several times to display the desired maintenance code on the LCD. Then press the Set key. (3) To make the machine return to the sta...

8 - 5 Confidential 8.4 DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS 8.4.1 EEPROM Parameter Initialization (Function code 01/91) „ Function The machine initializes the parameters, user switches, and firmware switches registered in the EEPROM, to the initial values. Entering the function code 01...

8 - 7 Confidential Scanning Compensation Data List a) b) c) d) e) f) g) h) i) j) k) l) m) n) q)

8 - 9 Confidential 8.4.4 ADF Performance Test (Function code 08) „ Function The machine counts the documents fed by the automatic document feeder (ADF) and displays the count on the LCD for checking the ADF performance. „ Operating Procedure (1) Set documents. (Allowable up to the ADF capacity.) The...

8 - 1 0 Confidential 8.4.5 Test Pattern 1 (Function code 09) „ Function This function, much like the copying function, prints out test pattern 1 to allow the service personnel to check for record data missing or print quality. „ Operating Procedure MFC7420/7820N Press the 0 and 9 keys in this order ...

8 - 1 1 Confidential 8.4.6 Firmware Switch Setting and Printout 8.4.6.1 Firmware switch setting (Function code 10) Function The machine incorporates the following firmware switch functions which may be activated with the procedures using the control panel keys and buttons. The firmware switches have...

8 - 1 2 Confidential Firmware Switches (WSW01 through WSW51) Continued WSW No. Function WSW38 V.34 transmission settings WSW39 V.34 transmission speed WSW40 V.34 modem settings WSW41 ON-duration of the scanning light source WSW42 Internet mail settings WSW43 Function setting 21 WSW44 Speeding up sca...

8 - 1 3 Confidential DCP7010/7020/7025 (1) Press the key or key several times to display the “MAINTENANCE 10” code on the LCD. Then press the Set key. The machine displays the "WSW00" on the LCD and becomes ready to accept a firmware switch number. (2) Press the key or key to display the fir...

8 - 1 8 Confidential 8.4.9 Sensor Operational Check (Function code 32) „ Function This function allows you to check whether the 9 sensors. „ Operating Procedure (1) MFC7420/7820N Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. DCO7010/7020/7025 Press the key or key...

8 - 1 9 Confidential (2) Change the detecting conditions to check that the indication on the LCD changes according to the sensor states. For instance, insert paper through the document front (or rear) sensor or the registration sensor (s), open the front cover or the document cover, remove the toner...

8 - 2 0 Confidential 8.4.10 Received Data Transfer Function (Function code 53) (Not applicable to DCP7010/7020/7025) „ Function This function transfers received FAX data to another machine. It is useful when the machine cannot print received data due to the printing mechanism defective. NOTE: The nu...

8 - 2 2 Confidential 8.4.11 Fine Adjustment of Scan Start/End Positions (Function code 54) (Not applicable to DCP7010/7020/7025) „ Function This function is to adjust the scan start/end positions. „ Operating Procedure (1) Press the 5 and 4 keys in this order in the initial stage of the maintenance ...

8 - 2 3 Confidential MAINTENANCE ACCEPTED 1. ADF 2. FB SCAN START ADJ. + - + - + - MAINTENANCE MAINTENANCE 5 and 4 select 2 second later 1 or 2 select Menu/Set key Stop/Exit key Stop/Exit key key key 1 second later key key Menu/Set key

8 - 2 6 Confidential 8.4.15 Display of the Equipment’s Log Information (Function code 80) „ Function The equipment may display its log information on the LCD. „ Operating Procedure (1) MFC7420/7820N Press the 8 and 0 keys in this order in the initial stage of the maintenance mode. DCP7010/7020/7025 ...

8 - 2 9 Confidential 8.4.18 Cancellation of the Memory Security Mode (Not applicable to DCP7010/7020/7025 and the Japanese model) „ Function (Not applicable to DCP7010/7020/7025) This procedure can cancel the memory security mode. Use this procedure if the user forgets his/her password entered when ...

Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING

Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING This chapter details error messages and codes that the incorporated self-diagnostic functions display if any error or malfunction occurs. If any error message appears, refer to this chapter to find which components should be checked or repl...

Confidential 9 - 1 9.1 ERROR INDICATION To help the user or the service personnel promptly locate the cause of a problem (if any), the facsimile equipment incorporates the self-diagnostic functions which display error messages for equipment errors and communications errors. For the communications er...

Confidential 9 - 3 ERROR MESSAGE CAUSE ACTION Machine too Hot The inside of the machine is too hot. Make sure that the fan in the MFC is spinning and the exhaust outlet is not blocked by something. If the fan is spinning, remove some obstacles around the exhaust outlet, and then leave the MFC turned...

Confidential 9 - 6 The solution when Error Code 76,77,78 shown in the machine: It’s possible that the temperature of the heater rises when these kinds of error occur. Therefore, the heater is programmed to turn off the power for 10 minutes after the switch is on for the safety concern when the error...

Confidential 9 - 1 2 (3) Compatibility [checking the NSF and DIS] Code 1 Code 2 Causes 32 01 Remote terminal only with V.29 capability in 2400 or 4800 bps transmission. 32 02 Remote terminal not ready for polling. 32 10 Remote terminal not equipped with password function or its password switch OFF. ...

Confidential 9 - 1 3 (5) Command reception [checking the NSF and DIS after transmission of NSS and DCS] Code 1 Code 2 Causes 50 01 Vertical resolution capability changed after compensation of background color. (6) ID checking Code 1 Code 2 Causes 63 01 Password plus "lower 4 digits of telephone ...

Confidential 9 - 1 4 (10) Video signal reception Code 1 Code 2 Causes A0 03 Error correction sequence not terminated even at the final transmission speed for fallback. A0 11 Receive buffer empty. (5-second time-out) A0 12 Receive buffer full during operation except receiving into memory. A0 13 Decod...

Confidential 9 - 1 5 9.2 TROUBLESHOOTING 9.2.1 Introduction This section gives the service personnel some of the troubleshooting procedures to be followed if an error or malfunction occurs with the facsimile equipment. It is impossible to anticipate all of the possible problems which may occur in fu...

Confidential 9 - 1 6 9.2.4 Troubleshooting Based on Problem Type [ 1 ] Paper feeding problems Even if the paper is printed and ejected without any problems such as paper jams, paper feeding problems below may appear. Users can clear these problems by following the ‘User Check’ items for each problem...

Confidential 9 - 1 7 F-3 Page skew User Check (1) Check that the paper or other media is loaded into the paper tray correctly and that the paper guides are not too tight or too loose against the paper stack. (2) If using the manual feed slot, check how to load paper into the manual feed slot correct...

Confidential 9 - 3 0 I-3 Completely blank Possible cause Step Check Result Remedy Ground contacts Developing bias contact failure 1 Are the developing bias contacts between the printer body and drum unit dirty? Yes Clean the electrodes at both sides. (4) Yes Clean the shaft and the electrode. (1) Dr...

Confidential 9 - 3 2 I-5 Dirt on the back of paper Possible cause Step Check Result Remedy Fixing unit dirty 1 Is the pressure roller dirty? Is any other area in the printer dirty? Yes Clean the pressure roller referring to the following procedure. Yes Replace the drum unit Dirt in the drum unit 2 I...

Confidential 9 - 4 0 NOTE: Clean the drum unit as follows. (1) Remove the toner cartridge from the drum unit. Place the printing samples in front of the drum unit, and find the exact position of the image defect. (2) Turn the drum gear by hand while looking at the surface of the exposure drum. (3) W...

Confidential 9 - 4 7 „ „ „ „ Location of Grounding Contacts • Drum unit • Printer body & paper tray (2) Wire cleaner Toner cartridge (4) Developer roller (1) Exposure drum (6) Transfer roller (5) Grid (7) Cleaner (3) Charge Drum Unit (4) Developer roller (3) Charge (5) Grid (7) Cleaner (1) Expos...

Confidential 9 - 5 0 [ 6 ] Network problem If the error related to network occurs, refer to the following sections; „ „ „ „ Installation problem The Brother print server is not found during setup of the network print software installation or from the printer driver of the Brother printer in Windows ...

Confidential 9 - 5 1 (5) Make the following selection. Make sure that your print server appears. If it is visible, then the connection is good. Otherwise, go to Step 5. 5. If you have tried 1 to 4 above and it does not work, then reset the print server back to the default factory settings and try fr...

Confidential 9 - 5 2 For Macintosh ® For Mac OS ® 9.1 to 9.2 (1) From the Apple menu, open the Chooser . (2) Click the Brother Laser (IP) icon, and make sure that your print server name appears in the right frame. If it is visible, then the connection is good. Otherwise, go to Step (4). For Mac OS ®...

Confidential 9 - 5 3 <Windows ® 95/98/Me and Windows NT ® 4.0 Peer-to-Peer print (NetBIOS) troubleshooting> If you are having trouble printing on a Windows ® 95/98/Me, Windows NT ® 4.0 or later Peer-to-Peer network (NetBIOS), check the following: 1. Make sure that the Brother NetBIOS Port driv...

Confidential 9 - 5 4 [ 7 ] Troubleshooting of the control panel L-1 Nothing is displayed on the LCD. User Check (1) Verify if the power switch is turned off. Possible cause Step Check Result Remedy Connection between main PCB and control panel PCB 1 Main PCB and control panel PCB are properly connec...

Confidential MFC7420/7820N DCP7010/7020/7025 APPENDIX 1. SERIAL NUMBERING SYSTEM This appendix shows the location of serial number labels put on some parts and lists the coding information pertaining to the serial numbers.

App. 1-1 Confidential SERIAL NUMBERING SYSTEM Individual machines have a serial number label for the machine itself and a property label for the head/carriage unit. This section lists the coding information for those serial numbers and property codes. (1) Serial number label for the machine itself L...

App. 1-2 Confidential (2) Laser unit serial label REGARDING X delay and Y delay It indicates required delay amount for writing in each of main (X) and sub (Y) scanning direction Location LSU MODEL DISTINCTION ERAME MANUFACTURER AND MOLD DISTINCTION T1 THE 1st. MOLD Y3 THE 3rd. MOLD POLYGON MOTOR DIS...

Confidential MFC7420/7820N DCP7010/7020/7025 APPENDIX 2. FIRMWARE INSTALLATION This appendix provides instructions on how to update firmware stored in the flash ROM on the main PCB or load firmware to a new main PCB from the host PC. No hardware replacement is required for updating. A2.1 INSTALLING ...

A p p . 2 - 1 Confidential A2.1 INSTALLING THE UPDATE DATA TO THE MACHINE If you want to update the current program stored in the flash ROM of the main PCB to the newer version or after you replace the main PCB, install the update program onto the flash ROM. The program installation requires a PC/AT...

A p p . 2 - 3 Confidential „ If you use USB cable Preparation You need to have the BHL2-Maintenance Printer driver and FILEDG32.exe (provided by Brother Industries) on hand. Save them in an arbitrary folder in your PC. Installing the BHL2-Maintenance Printer driver To identify terminals connected vi...

A p p . 2 - 4 Confidential (6) The following screen appears, indicating the detection of new hardware device by the system. Click Next to proceed. (7) Select "Search for a suitable driver for my device (recommended)" and click Next . (8) Select "Specify a location" and click Next .

A p p . 2 - 5 Confidential (9) Select the folder where the copy of the BHL2-Maintenance Printer driver is located (or click Browse to specify it), then click OK . (This sample screen is captured on the Windows 2000 desktop.) (10) Click Next . (11) To proceed, click Yes .

A p p . 2 - 6 Confidential (12) If the driver is successfully installed, the following message window appears. Click Finish to return to Windows. NOTE: After completion of the driver installation, if the machine exits the maintenance mode, the "Found New Hardware Wizard" screen in step (6) a...

A p p . 2 - 7 Confidential Writing the update programs/data onto the flash ROM of the machine After the installation procedure of the printer driver, proceed to the firmware writing operation. If the printer driver has been installed so that you start from writing firmware, unplug the power cord fro...

A p p . 2 - 9 Confidential A2.2 SETTING ID CODES TO MACHINES Brother driver machines are assigned unique ID codes (character strings) at the factory. If you replace the main PCB of the machine, the machine will lose its assigned ID code so that it will not be identified by the connected PC*. You nee...

Confidential MFC7420/7820N DCP7010/7020/7025 APPENDIX 3. CUSTOMIZING CODES ACCORDING TO SHIPPING DESTINATION This appendix lists the customizing codes for the various preferences exclusively designed for each destination (e.g. language). Those codes are stored in the memory (EEPROM) mounted on the m...

App. 3-1 Confidential EEPROM CUSTOMIZING CODES This function allows you to customize the EEPROM according to language, function settings, and firmware switch settings. „ Operating Procedure (1) Press the Menu/Set (Menu) and Start keys. Next press the key four times to make the machine enter the main...

App. 4-13 Confidential WSW09 (Protocol definition 1) Selector No. Function Setting and Specifications 1 Frame length selection 0: 256 octets 1: 64 octets 2 Use of non-standard commands 0: Allowed 1: Prohibited 3 4 No. of retries No. 3 4 0 0 : 4 times 0 1 : 3 times 1 0 : 2 times 1 1 : 1 time 5 T5 tim...

App. 4-15 Confidential WSW11 (Busy tone setting) Selector No. Function Setting and Specifications 1 2 Busy tone frequency band control No. 1 2 0 0 : Narrows by 10 Hz 0 1 : Initial value 1 x : Widens by 10 Hz 3 1: 250-750/250-750 ms 4 1: 400-600/400-600 ms 5 1: 175-440/175-440 ms 6 1: 100-1000 ms/17-...

App. 4-48 Confidential WSW44 ( Speeding up scanning-1) Selector No. Function Setting and Specifications 1 | 5 Not used. 6 | 8 Effective time length of the white level compensation data obtained beforehand (Not used.) No. 6 7 8 0 0 0 : Obtained compensation data ineffective 0 0 1 : 1 min. 0 1 0 : 3 m...

Confidential MFC7420/7820N DCP7010/7020/7025 APPENDIX 5. WIRING DIAGRAM This appendix provides the wiring diagram that helps you understand the connections between PCBs.

Confidential MFC7420/7820N DCP7010/7020/7025 APPENDIX 6. CIRCUIT DIAGRAMS This appendix provides the circuit diagrams of the NCU PCB and power supply PCB. A. NCU PCB: MFC7420 (U.S.A. and CANADA models) NCU PCB: MFC7820N (U.S.A. and CANADA models) NCU PCB: MFC7420 (EUROPE models) NCU PCB: MFC7820N (E...