Page 2 - Specifications are subject to change without notice.
© Copyright Brother 1998 All rights reserved. No part of this publication may be reproduced in anyform or by any means without permission in writingfrom the publisher. Specifications are subject to change without notice.
Page 3 - PREFACE; This manual is made up of six chapters and appendices.; II
PREFACE This publication is a Service Manual covering the specifications, construction, theory of operation,and maintenance of the Brother facsimile equipment. It includes information required for fieldtroubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnelwil...
Page 4 - SAFETY INFORMATION
SAFETY INFORMATION Laser Safety (110-120V Model only) This printer is certified as a Class 1 laser product under the US Department of Health and HumanServices (DHHS) Radiation Performance Standard according to the Radiation Control for Health andSafety Act of 1968. This means that the printer does n...
Page 5 - CHAPTER; GENERAL DESCRIPTION
Page 6 - CONTENTS
CONTENTS 1. EQUIPMENT OUTLINE ........................................................................................ I -1 1.1 External Appearance and Weight.................................................................. I -1 1.2 Components ..........................................................
Page 7 - EQUIPMENT OUTLINE; External Appearance and Weight; Components
I - 1 1. EQUIPMENT OUTLINE 1.1 External Appearance and Weight The figure below shows the equipment appearance and approximate dimensions. Weight: Machine proper Approx. 7.2 kg Machine (incl. drum unit & toner cartridge) Approx. 8.5 kg In package Approx. 12 kg 1.2 Components The equipment consist...
Page 9 - SPECIFICATIONS
I - 3 2. SPECIFICATIONS (1/2) Model FAX2750 MFC4350 Color White (1397) White (1138) PRINTER Available with option * 1 Yes Engine/Type [YL (VA)] YL (VA) PPM [6 ppm] 6 ppm dpi (output resolution) [600 x 600] 600 x 600 Paper Capacity [200] 200 Emulation (Standard) - PCL4 Standards [Windows GDI (600 x 6...
Page 17 - INSTALLATION
Page 19 - Connecting the equipment to your computer
II - 1 1. INSTALLING THE UPDATE DATA TO THEFACSIMILE EQUIPMENT If the program version is updated or the main PCB is replaced, install the update program onto theflash ROM of the main PCB. The program installation requires a host computer satisfying the following requirements: - CPU Pentium 75 or hig...
Page 20 - filename; ENTER; During downloading, the equipment beeps
II - 2 Installing the update data onto the flash ROM of the facsimile equipment (1) Load the floppy disk which stores the update data and transfer utility into the floppy diskdrive of your computer. (Or, copy the update data and transfer utility onto the same directory of the hard disk.) (2) Click t...
Page 21 - THEORY OF OPERATION
Page 23 - OVERVIEW
III - 1 1. OVERVIEW *Not provided on the FAX-8250P/MFC-9050.
Page 24 - MECHANISMS
III - 2 2. MECHANISMS The facsimile equipment is classified into the following mechanisms: n SCANNER MECHANISM - Document feeding and ejecting mechanism - Document scanning mechanism n LASER PRINTING MECHANISM - Paper pulling-in, registration, feeding, and ejecting mechanisms - Print process mechani...
Page 25 - Scanner Mechanism
III - 3 2.1 Scanner Mechanism 2.1.1 Document feeding and ejecting mechanism This mechanism consists of the document stacker, automatic document feeder (ADF), documentejection roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.) If the operator sets documents on t...
Page 26 - Laser Printing Mechanism
III - 4 2.2 Laser Printing Mechanism 2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism
Page 28 - Print process mechanism
III - 6 2.2.2 Print process mechanism The print process unit works with laser beam, electrical charges, and toner. The graph belowshows the transition of electrical charge on the surface of the laser-sensitive drum through the fiveprocesses: charging, exposing, developing, transferring, and erasing ...
Page 31 - Heat-fixing mechanism
III - 9 2.2.3 Heat-fixing mechanism As the paper passes between the heater roller and the pressure roller in the heat-fixing unit, theheater roller fuses the toner on the paper.
Page 32 - Sensors and Actuators
III - 10 2.3 Sensors and Actuators This equipment has ten sensors: seven photosensors, two thermisters and a mechanical switch asdescribed below. Sensor name Type Located on Document front sensor Photosensor Control panel PCB ASSY(Document sensor PCB) Document rear sensor Photosensor Control panel P...
Page 34 - CONTROL ELECTRONICS; Configuration
III - 12 3. CONTROL ELECTRONICS 3.1 Configuration The hardware configuration of the facsimile equipment is shown below. Configuration of Facsimile Equipment (NOTE 1) Provided on the FAX-8250P/MFC-9050 (French versiononly)/MFC-9550/MFC6650MC. (NOTE 2) Provided on the European, Australian, Indonesian,...
Page 35 - Main PCB
III - 13 3.2 Main PCB The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of aFAX engine (ASIC), memories, MODEM, motor drive circuitry, sensor detection circuitry, andanalog circuits for scanning, printing, and power transmission shifting. EEPROM: Electric...
Page 37 - NCU PCB
III - 15 3.3 NCU PCB The NCU PCB switches the communications line to telephone or built-in MODEM, under thecontrol of the main PCB. U.S.A. versions
Page 39 - Control Panel PCB
III - 17 3.4 Control Panel PCB The control panel PCB and the main PCB communicate with each other by serially transmittingcommands and data. The control panel unit consists of a gate array, an LCD and LEDs, which are controlled by the gatearray according to commands issued from the FAX engine on the...
Page 40 - Power Supply PCB
III - 18 3.5 Power Supply PCB [ 1 ] Low-voltage power supply PCB The low-voltage power supply uses the switching regulation system to generate DC power (+5Vand +24V) from a commercial AC power supply for the driver circuits. The +5V source is fed tothe logic, control panel, sensors, CIS unit, etc. T...
Page 41 - High-voltage power supply PCB
III - 19 [ 2 ] High-voltage power supply PCB This power supply generates high-voltage power sources from the 24V source fed from the low-voltage power supply for charging, developing, and transferring in the laser printing process. High-voltage Power Supply Circuit
Page 42 - DISASSEMBLY/REASSEMBLY AND
CHAPTER IV . DISASSEMBLY/REASSEMBLY AND LUBRICATION
Page 43 - IV; Handset Mount and Hook Switch PCB
i CONTENTS 1. DISASSEMBLY/REASSEMBLY ........................................................................... IV -1 n Safety Precautions.............................................................................................. IV -1 Tightening Torque List ........................................
Page 45 - DISASSEMBLY/REASSEMBLY; Safety Precautions; before starting maintenance jobs. It is HOT!
IV - 1 1. DISASSEMBLY/REASSEMBLY n n Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautionsduring maintenance work. (1) Unplug the power cord from the power outlet before replacing parts or units. When having access to the power supply, be ...
Page 46 - Tightening Torque List
IV - 2 Tightening Torque List Location Screw type Q'ty Tightening torque Loosening torque (kg•cm) (kg•cm) Option cover Screw, pan (washer) M3x8DB 2 4 ±1 2 to 6 ADF parts Taptite, pan (washer) B M3x6 1 4 ±1 2 to 6 Panel rear cover Taptite, cup B M3x8 2 6 ±1 2 to 6 Scanner frame ASSY Taptite, cup B M3...
Page 47 - Preparation; Prior to proceeding to the disassembly procedure,; How to Access the Object Component; in
IV - 3 n n Preparation Prior to proceeding to the disassembly procedure, (1) Unplug - the modular jack of the telephone line,- the modular jack of the curled cord (and remove the handset),- the PC interface cable, and- the modular jack of an external telephone set if connected. (Not shown below.) (2...
Page 48 - Disassembly Order Flow
Page 51 - Multi-purpose Sheet Feeder
IV - 7 1.2 Multi-purpose Sheet Feeder (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, and then fully open the top cover. (3) Pull either one of the right and left tabs provided on the main cover outwards and slightly lift up the multi-purpose shee...
Page 52 - Document Guide Base
IV - 8 1.3 Document Guide Base (1) Turn up the document guide base towards you. (2) Push the right or left end of the document guide base inwards and take it off.
Page 53 - Control Panel ASSY; with your thumbs and open the control panel ASSY further (arrow
IV - 9 1.4 Control Panel ASSY (1) Slightly open the control panel ASSY. (2) Push the right and left arms of the control panel ASSY outwards (in the direction of arrow • ) with your thumbs and open the control panel ASSY further (arrow ‚ ) to unhook those arms from bosses “x” provided on the scanner ...
Page 54 - Panel Rear Cover and Control Panel; parts will have to be put back in.
IV - 10 1.5 Panel Rear Cover and Control Panel (1) Place the control panel ASSY upside down. If you do not need to remove the ADF parts, anti-static brush, shield film, document pressurebar, or document rear sensor actuator, skip to step (6). (2) To remove the ADF parts (spring plates, separation ru...
Page 56 - Reassembling Notes
IV - 12 (12) As shown below, insert the tip of a flat screwdriver under clamp "A" from the rear and push up clamp "A" slightly to release the LCD, and then take out the LCD while pulling the LCD flatcable gently. NOTE: Do not take out the LCD except when the LCD is defective and requ...
Page 57 - Document Feed Roller ASSY and Document Ejection Roller ASSY; upwards, without removing the shield film.
IV - 13 1.6 Document Feed Roller ASSY and Document Ejection Roller ASSY (1) Lightly push down arm rib "a" and shift the document feed roller ASSY to the right and upwards. (2) Lightly push down arm rib "b" and shift the document ejection roller ASSY to the right and upwards, without ...
Page 58 - Scanner Frame ASSY; out the ASSY from the top cover.
IV - 14 1.7 Scanner Frame ASSY (1) You can remove the following parts from the top of the scanner frame ASSY without taking out the ASSY from the top cover. • CIS film • Shield film • CIS unit (shown on the next page). Lightly pull up the arm, move the CIS unit to the left,and lift up the right edge...
Page 64 - When setting the scanner frame ASSY back into place,
IV - 20 n n Reassembling Notes • When reinstalling the scanner motor, fit it in the latch provided on the scanner frame with theconnector facing up and then secure it with the screw. (See page IV-17.) • When setting the scanner frame ASSY back into place, - secure the grounding terminal to the scann...
Page 65 - Top Cover
IV - 21 1.8 Top Cover (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, and then fully open the top cover. (3) Pull the panel-main harness and CIS harness towards you. (4) Remove the adhesive tape and pull the scanner motor harness and grounding wir...
Page 72 - Laser Unit and Toner Sensor PCB; (2) Slightly lift up the toner sensor PCB and disconnect its harness.; Make sure that the sponge is placed below the laser unit.
IV - 28 1.11 Laser Unit and Toner Sensor PCB (1) Remove the screw (Taptite, cup B M3x8) from the toner sensor PCB. (2) Slightly lift up the toner sensor PCB and disconnect its harness. (3) Remove the three screws from the laser unit. (4) Slightly lift up the laser unit and disconnect the following f...
Page 78 - Setting up the main PCB after replacement
Page 80 - Route the fan harness through the harness guide as shown above.
IV - 36 1.16 Fan (1) If the main PCB is installed, remove the screw from the main PCB (refer to Section 1.14). (2) Slightly lift up the main PCB and disconnect the fan harness from the main PCB. (3) Take out the fan support. (4) Pull up the fan. n n Reassembling Notes • Put the fan back into place w...
Page 81 - Actuator; Put the speaker into place with its harness facing to the front.
IV - 37 1.17 Registration Sensor Actuator, Sheet Feeder Cover Sensor Actuator, and Top Cover Sensor Actuator (1) Pull up the registration sensor actuator, sheet feeder cover sensor actuator, and top cover sensor actuator. 1.18 Speaker (1) Pull the speaker spring inwards and pull up the speaker. n n ...
Page 86 - Scanner Grounding Plate
IV - 42 1.21 Scanner Grounding Plate (1) Make sure that the heat-fixing unit is removed. (2) Remove the screw from the scanner grounding plate and take it off. (If the bottom plate has not been removed, remove front screw "c" also (see page IV-29) that secures both thescanner grounding plate...
Page 88 - Cleaning of High-voltage Contacts and Grounding Contacts; Grounding contacts
IV - 44 1.23 Cleaning of High-voltage Contacts and Grounding Contacts If any toner particles, paper dust or dirt are on the contacts, clean them out. This will ensure thatpower flows correctly to enable printing. Grounding contacts High-voltage contacts
Page 89 - LUBRICATION; Document feed roller ASSY and document ejection roller ASSY
IV - 45 2. LUBRICATION Apply the specified lubricants to the lubrication points as shown below. Lubricant amount Thin coat of grease (1 mm 3 ) Half of a rice-sized pinch of grease (3 mm 3 ) Rice-sized pinch of grease (6 mm 3 ) Molykote EM-30LGor EM-30L(Dow Corning) Conductive greaseFLOIL GE676(Kanto...
Page 90 - Control panel locks
IV - 46 [ 2 ] Control panel locks [ 3 ] Scanner frame ASSY and separation roller gear
Page 91 - Top cover lock spring
IV - 47 [ 4 ] Top cover lock spring [ 5 ] Gear drive unit
Page 92 - MAINTENANCE MODE
Page 94 - ENTRY INTO THE MAINTENANCE MODE; Function; Menu; Stop
V - 1 1. ENTRY INTO THE MAINTENANCE MODE FAX2750/MFC4350/MFC4650/MFC6650MC: To make the equipment enter the maintenancemode, press the Function , * , 2 , 8 , 6 , and 4 keys in this order. Within 2 seconds FAX-8250P/MFC-9050/MFC-9550: To make the equipment enter the maintenance mode, pressthe Menu , ...
Page 97 - EEPROM Parameter Initialization
V - 4 3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS 3.1 EEPROM Parameter Initialization n n Function The equipment initializes the parameters, user switches, and firmware switches registered in theEEPROM, to the initial values. Entering the function code 01 initializes all of the EEPROM area...
Page 98 - and
V - 5 3.2 Printout of Scanning Compensation Data n n Function The equipment prints out the white and black level data for scanning compensation. n n Operating Procedure Do not start this function merely after powering on the equipment but start it after carrying out asequence of scanning operation. ...
Page 101 - Press the
V - 8 3.4 Test Pattern 1 n n Function This function, much like the copying function, prints out test pattern 1 to allow the servicepersonnel to check for record data missing or print quality. n n Operating Procedure Press the 0 and 9 keys in this order in the initial stage of the maintenance mode. T...
Page 104 - Detailed Description for the Firmware Switches
V - 11 n n Detailed Description for the Firmware Switches WSW01 (Dial pulse setting) Selector No. Function Setting and Specifications 1 2 Dial pulse generation mode No. 1 2 0 0 : N 0 1 : N+1 1 0 : 10-N 1 1 : N 3 4 Break time length in pulse dialing No. 3 4 0 0 : 60 ms 0 1 : 67 ms 1 0 : 40 ms (for 16...
Page 108 - These selectors set the break time length.
V - 15 WSW04 (TRANSFER facility setting) Selector No. Function Setting and Specifications 1 Earth function in transfer facility 0: Provided 1: Not provided 2 3 Dual tone detection frequency inICM recording No. 2 3 0 0 : 350 and 440 Hz (A) 0 1 : 440 and 480 Hz (B) 1 x : 480 and 620 Hz (C) 4 Tone dete...
Page 130 - Selector; This setting will not be limited by selector 8 of WSW23.
V - 37 l Selector 7: Resolution level for reception This selector determines whether the resolution should be limited at the start of reception in thesleep mode. l Selector 8: Limitation of attenuation level Setting this selector to "0" limits the transmitting level of the modem to 10 dB. Th...
Page 135 - Start
V - 42 WSW29 (Function setting 7) Selector No. Function Setting and Specifications 1 | 3 Compression threshold level forvoice signals inputted via thenetwork in the built-in TADoperation No. 1 2 3 0 0 0 : -47.0 dBm (A) 0 0 1 : -48.5 dBm (B) 0 1 0 : -50.0 dBm (C) 0 1 1 : -51.5 dBm (D) 1 0 0 : -53.0 d...
Page 143 - key twice in the initial stage of the maintenance mode.
V - 50 [ B ] Printout of firmware switch data n n Function The equipment prints out the setting items and contents specified by the firmware switches. n n Operating Procedure (1) Press the 1 key twice in the initial stage of the maintenance mode. The "PRINTING" will appear on the LCD. (2) Th...
Page 148 - If a wrong 4-digit code is entered, the equipment will malfunction.
V - 55 3.9 CIS Scanner Area Setting n n Function The equipment sets the CIS scanner area and stores it into the EEPROM. n n Operating Procedure (1) Press the 5 key twice in the initial stage of the maintenance mode. The "SCANNER AREA SET," "BLACK LEVEL INIT," and "WHITE LEVEL INI...
Page 150 - messages and ICM received in the memory security mode.; Operating Procedure; (1) When the SECURE MODE is displayed on the LCD, hold down the; key and press
V - 57 3.13 Cancellation of the Memory Security Mode n n Function This procedure can cancel the memory security mode. Use this procedure if the user forgetshis/her password entered when setting the memory security mode so as not to exit from thememory security mode. NOTE: Carrying out this procedure...
Page 151 - ERROR INDICATION AND
Page 153 - Equipment Errors
VI - 1 1. ERROR INDICATION To help the user or the service personnel promptly locate the cause of a problem (if any), thefacsimile equipment incorporates the self-diagnostic functions which display error messages forequipment errors and communications errors. For the communications errors, the equip...
Page 158 - Communications Errors; If a communications error occurs, the facsimile equipment
VI - 6 1.2 Communications Errors If a communications error occurs, the facsimile equipment emits an audible alarm (intermittent beeping) for approximately 4 seconds, displays the corresponding error message, and prints out the transmission verification report if the equipment is in sending operation...
Page 163 - Signal isolation
VI - 11 (9) Signal isolation Code 1 Code 2 Causes 90 01 Unable to detect video signals and commands within 6 secondsafter CFR is transmitted. 90 02 Received PPS containing invalid page count or block count. (10) Video signal reception Code 1 Code 2 Causes A0 03 Error correction sequence not terminat...
Page 165 - TROUBLESHOOTING; Introduction; When repairing the PCBs, handle them with extra care.; Checking prior to Troubleshooting; Each voltage level on AC input lines and DC lines is correct.
VI - 13 2. TROUBLESHOOTING 2.1 Introduction This section gives the service personnel some of the troubleshooting procedures to be followed ifan error or malfunction occurs with the facsimile equipment. It is impossible to anticipate all of thepossible problems which may occur in future and determine...
Page 166 - Troubleshooting Procedures
VI - 14 2.4 Troubleshooting Procedures [ 1 ] Control panel related Trouble Check: (1) LCD shows nothing. l Panel-main harness between the main PCB and thecontrol panel PCB l Control panel PCB l Low-voltage power supply PCB l Main PCB l LCD (2) Control panel inoperative. l Panel-main harness between ...
Page 173 - Location of High-voltage Contacts and Grounding Contacts; Grounding Contacts
VI - 21 Location of High-voltage Contacts and Grounding Contacts Grounding Contacts High-voltage Contacts • ‚ ƒ For transfer roller ‡ For developerroller † For corona wire … For grid „ For cleanerroller Geardrive unit Drumgroundingboard ‚ • ‚ • ƒ „ † ‡ … High-voltagepower supplyPCB ‡ ƒ „ … † Drum un...
Page 174 - Printed in Japan
Page 175 - Appendix 1. EEPROM Customizing Codes
FAX2750/FAX-8250P MFC4350/MFC4650/MFC6650MC MFC-9050/MFC-9550 LJ6106MFC/LJ6206MFC/L621 Appendix 1. EEPROM Customizing Codes
Page 176 - EEPROM Customizing Codes
EEPROM Customizing Codes This function allows you to customize the EEPROM according to language, function settings, andfirmware switch settings. n Operating Procedure (1) FAX2750/MFC4350/MFC4650/MFC6650MC/L621/LJ6106MFC/LJ6206MFC: To make the equipment enter the maintenance mode, press the Function ...
Page 177 - EEPROM Customizing Codes List
n EEPROM Customizing Codes List (1) FAX2750/MFC4350/MFC4650/MFC6650MC Versions Model FAX2750 MFC4350 MFC4650 MFC6650MC U.S.A. 1001 1101 1201 1001 CANADA 0002 0102 0202 0002 ASIA 0040 0040 AUSTRALIA 0006 0006 INDONESIA 0040 0040 GULF 0001 0001 NEW ZEALAND 0027 0027 TAIWAN 0023 0023 S. AMERICA 0201 SO...
Page 179 - Appendix 2. Circuit Diagrams
FAX2750/FAX-8250P MFC4350/MFC4650/MFC6650MC MFC-9050/MFC-9550 Appendix 2. Circuit Diagrams A. Main PCB B. Network Control Unit (NCU) PCB C. Control Panel PCB D. Power Supply PCBs
Page 189 - NCU
5 R E F 4 S 0 V R A 3 5 1 x 2 + 2 6 V S 0 V + 5 V 8 4 S 0 V 6 3 1 4 2 1 R E F 4 3 4 3 S 0 V + 2 6 V C M L C R 1 M Z F - 2 4 H G o r O U A Z - S S - 1 2 4 D F G + 5 V 4 2 5 3 4 3 1 2 P L S S 0 V + - 2 1 4 3 S 0 V R L 2 2 1 4 3 T E L O F F R E F 4 5 C I S 0 V S 0 V N C U S L S 0 V + 2 6 C M L R L 2 C ...
