Brother International IntelliFax-3550 Service Manual

Brother International IntelliFax-3550 Manual

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  • Brother International IntelliFax-3550 | Service Manual - Page 1
    FACSIMILE EQUIPMENT SERVICE MANUAL MODEL: FAX3550/3650/8000P/8200P MFC4450/4550/4550plus MFC6550MC/7550MC/7650MC MFC9000/9500
  • Brother International IntelliFax-3550 | Service Manual - Page 2
    © Copyright Brother 1998 All rights reserved. No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher. Specifications are subject to change without notice.
  • Brother International IntelliFax-3550 | Service Manual - Page 3
    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 field troubleshooting and repair-disassembly, reassembly, and adjustment-so that service personnel will be
  • Brother International IntelliFax-3550 | Service Manual - Page 4
    under the US Department of Health and Human Services (DHHS) Radiation Performance Standard according to the beam cannot escape from the machine during any phase of user operation. CDRH Regulations (110 United States. The label for Japanese products MANUFACTURED: AUGUST 1998 K BROTHER
  • Brother International IntelliFax-3550 | Service Manual - Page 5
    CHAPTER I. GENERAL DESCRIPTION
  • Brother International IntelliFax-3550 | Service Manual - Page 6
    CONTENTS 1. EQUIPMENT OUTLINE I-1 1.1 External Appearance and Weight I-1 1.2 Components I-1 2. SPECIFICATIONS I-2
  • Brother International IntelliFax-3550 | Service Manual - Page 7
    handset) 452 (D) (Unit: mm) Weight: Machine proper In package Approx. 8.5 kg (excluding the drum unit and toner cartridge) Approx. 13.5 kg panel ASSY Drum unit with toner cartridge loaded Laser unit Heat-fixing unit Inner cover Handset Gear drive unit Low-voltage power supply ASSY Bottom
  • Brother International IntelliFax-3550 | Service Manual - Page 8
    Resident Fonts Disk Based Paper Handling Multi-purpose Sheet Feeder Printer Driver Toner Life (5%/page) Utility Software (1/2) FAX3550 1267 Option - - 600 class 1-99 Yes 50-200% 600 class 1-99 Yes 50-200% FAX Modem Modem Speed CCITT Group Coding Method Transmission Speed Input/Output Width LCD
  • Brother International IntelliFax-3550 | Service Manual - Page 9
    Fonts Resident Fonts Disk Based Paper Handling Multi-purpose Sheet Feeder Printer Driver Toner Life (5%/page) Utility Software FAX3650 1267 Option - - 200 400 1-99 No 50-200% 600 class 1-99 Yes 50-200% FAX Modem Modem Speed CCITT Group Coding Method Transmission Speed Input/Output Width LCD Size
  • Brother International IntelliFax-3550 | Service Manual - Page 10
    (Min.) Fonts Resident Fonts Disk Based Paper Handling Multi-purpose Tray Printer Driver Toner Life (5%/page) Utility Software FAX8000P 1138 Option - - - 200 - Light/Auto/Dark Multi-resolution Transmission Yes Yes Yes Yes FAX/TEL Switch Yes Yes Yes Yes Distinctive Ringing Yes Yes
  • Brother International IntelliFax-3550 | Service Manual - Page 11
    only) No Yes (PC only) Yes (PC only) Yes Yes Yes Yes Yes Yes MACHINE MEMORY 0.75 MB 0.75 MB 1 MB 2 MB OPTIONAL MEMORY (FAX & PRINTER FLEX) 1 or 2 MB 1 or 2 MB 1 or 2 MB 1 or 2 MB PC FAX (Send/Receive) Standard Option - Yes (by M/L) Class 1, 2 Yes (by M/L) Class 1, 2 Yes (by
  • Brother International IntelliFax-3550 | Service Manual - Page 12
    PC) Yes (Hardware & PC) Yes (PC only) Yes (PC only) Yes (PC only) Yes Yes MACHINE MEMORY 2 MB 1 MB 1 MB 2 MB OPTIONAL MEMORY 1 or 2 MB No 1 or 2 MB 1 or 2 MB (FAX & PRINTER FLEX) PC FAX (Send/Receive) Standard Option - Yes (by M/L) SMSI Yes (by M/L) SMSI Yes (by M/L) SMSI DATA MODEM
  • Brother International IntelliFax-3550 | Service Manual - Page 13
    (PC only) Yes Yes No No No No UK/SWISS/GER No No No Yes Yes MACHINE MEMORY 0.75 MB 1 MB 1 MB 2 MB OPTIONAL MEMORY (FAX & PRINTER FLEX) 1 or 2 MB 1 or 2 MB 1 or 2 MB 1 or 2 MB PC FAX (Send/Receive) Standard Option - Yes Class 2 Yes Class 2 Option - DATA MODEM No No No No
  • Brother International IntelliFax-3550 | Service Manual - Page 14
    CHAPTER II. INSTALLATION
  • Brother International IntelliFax-3550 | Service Manual - Page 15
    CONTENTS 1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT II-1
  • Brother International IntelliFax-3550 | Service Manual - Page 16
    1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT If the program version is updated or the main PCB is replaced, install the update program onto the flash ROM of the main PCB. The program installation requires a host computer satisfying the following requirements: - CPU - RAM - OS Pentium
  • Brother International IntelliFax-3550 | Service Manual - Page 17
    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 disk drive of your computer. (Or, copy the update data and transfer utility onto the same directory of the hard disk.) (2) Click the
  • Brother International IntelliFax-3550 | Service Manual - Page 18
    CHAPTER III. THEORY OF OPERATION
  • Brother International IntelliFax-3550 | Service Manual - Page 19
    3. CONTROL ELECTRONICS III-12 3.1 Configuration III-12 3.2 Main PCB III-13 3.3 Relay PCB III-23 3.4 NCU PCB III-24 3.5 Control Panel PCB III-27 3.6 Power Supply PCBs III-28 [ 1 ] Low-voltage power supply PCB III-28 [ 2 ] High-voltage power
  • Brother International IntelliFax-3550 | Service Manual - Page 20
    Charging, exposing, developing, transferring, erasing, feeding mechanism high-voltage power supplies AC and heat-fixing processes - Electrical charger - Laser unit (including the polygon motor) - Laser-sensitive drum - Developer roller - Transfer roller - Eraser lamp - Heater roller - Main
  • Brother International IntelliFax-3550 | Service Manual - Page 21
    2. MECHANISMS The equipment is classified into the following mechanisms: s SCANNER MECHANISM - Document feeding and ejecting mechanism - Document scanning mechanism s LASER PRINTING MECHANISM s SENSORS AND ACTUATORS - Paper pulling-in, registration, feeding, and ejecting mechanisms - Print
  • Brother International IntelliFax-3550 | Service Manual - Page 22
    roller ASSY Separation roller ASSY Document rear sensor actuator CCD unit Lens 1st mirror LED array Document tray (Front) 2.1.1 of the document take-in roller ASSY, separation roller ASSY, ADF parts and nip-related parts) feeds those documents into the equipment, starting from the bottom sheet
  • Brother International IntelliFax-3550 | Service Manual - Page 23
    Registration roller Paper ejecting mechanism Paper ejection roller Pull-in roller drive gear Main motor Paper ejection sensor actuator Paper tray Heater roller Laser-sensitive drum Gear drive unit Heater roller drive gear Paper ejection roller drive gear
  • Brother International IntelliFax-3550 | Service Manual - Page 24
    lever Solenoid spring Clutch spring Paper feed solenoid Gear drive unit Heater roller drive gear Paper ejection roller drive gear Pull- motor rotates clockwise, the rotation is transmitted via the gear train to the drum drive gear, heater roller drive gear, and paper ejection roller drive gear.
  • Brother International IntelliFax-3550 | Service Manual - Page 25
    process mechanism Toner augers Toner cartridge Toner sensor Paper Developer roller Transfer roller Drum unit Toner supply roller Polygon mirror Polygon motor Laser unit Cover glass Mirror Laser-sensitive drum Cleaner roller Charger (Corona wire) Mirror Electrical charge on the drum surface
  • Brother International IntelliFax-3550 | Service Manual - Page 26
    power supply applies DC bias to the corona wire to generate ion on the grid. The ion uniformly charges the surface of the laser-sensitive drum to approx drum holds a positive electrical charge, the laser beam issued from the laser unit scans the drum according to the print image to expose the drum
  • Brother International IntelliFax-3550 | Service Manual - Page 27
    process The developing process develops an electrostatic latent image formed on the drum in the exposing process, into a toner image. The developer roller attracts the toner particles fed from the toner cartridge by the toner supply roller, and then conveys them to the contact section with the laser
  • Brother International IntelliFax-3550 | Service Manual - Page 28
    mechanism Pressure roller (Paper ejection roller) Heater roller (including the FU lamp) Heat-fixing unit Paper (Paper ejection sensor actuator) As the paper passes between the heater roller and the pressure roller in the fixing unit, the heater roller fuses the toner on the paper. III - 9
  • Brother International IntelliFax-3550 | Service Manual - Page 29
    sensor which detects whether there is toner or a toner cartridge is loaded. • Toner thermister which detects the temperature of the toner cartridge. • Heater thermister which detects the temperature of the heater roller of the fixing unit. These photosensors are a photointerrupter consisting of
  • Brother International IntelliFax-3550 | Service Manual - Page 30
    On back of PCB) (Relay PCB) Toner sensor (Low-voltage power supply PCB) Hook switch sensor (Microswitch) Hook switch sensor actuator (Toner sensor PCB) (Eraser lamp board) Document front sensor actuator Document front sensor (Photosensor) (Fixing unit) (Document sensor PCB) Sheet feeder cover
  • Brother International IntelliFax-3550 | Service Manual - Page 31
    P3 P2 5-pin 5-pin 4-pin P1 P4 12-pin Main PCB ASIC 2-pin P18 MODEM 4-pin P9 2-pin P8 Laser unit Laser diode Polygon motor LASER PRINTING UNIT Toner sensor PCB *2 High-voltage *3 3-pin Fan 1 power supply PCB 4-pin Eraser lamp board Fan 2 Main motor Solenoid Heater thermister Fixing
  • Brother International IntelliFax-3550 | Service Manual - Page 32
    nucleus controlling the entire operation of the equipment, consists of a FAX engine (ASIC), memories, MODEM, motor drive circuits, sensor detection Control panel Relay PCB Main motor driver Image processor Fan 2 Main motor Solenoid Low-voltage power supply PCB Document sensor PCB Extended RAM
  • Brother International IntelliFax-3550 | Service Manual - Page 33
    1 2 Main PCB Circuit Diagram 1/7 1 FAX engine (ASIC) which manages the I/Os, memories, drivers and image proces- sor as well as controlling the laser printing unit. 2 8-pin modular connector for the PC interface (RS-232C), provided on the FAX3550/ 3650/8000P/8200P. III - 14
  • Brother International IntelliFax-3550 | Service Manual - Page 34
    bits) FAX3550/3650/8000P/8200P/MFC4450/4550/4550plus: This ROM is used only on the qualification machines for demonstration. MFC6550MC/7550MC/7650MC/9000/9500: This ROM stores the PCL4 (Driver programs for high-quality print). 3 DRAMs FAX3550/8000P/MFC4550/6550MC/7550MC/9000/9500: DRAM No. Model
  • Brother International IntelliFax-3550 | Service Manual - Page 35
    4 E2PROMs which store user settings. FAX3550/8000P/MFC4550/6550MC/7550MC/9000/9500: E2PROM No. #2 #3 Model FAX3550 16K x 1 bit 16K I/O connector for an optional serial interface board RS-100M which supports the RS-232C and RS-422. (Only for the MFC6550MC/7550MC/7650MC/9000/9500) III - 16
  • Brother International IntelliFax-3550 | Service Manual - Page 36
    for the document sensor PCB 1-1: Current sink transistor for driving the LED array 1-2: Synchronous clocks for the CCD unit 1-3: Image signal from the CCD unit 1-4: Signal from the document front sensor 1-5: Signal from the document rear sensor 2 Connector for the control panel 3 Image
  • Brother International IntelliFax-3550 | Service Manual - Page 37
    1-1 1-2 1 2 3 Main PCB Circuit Diagram 4/7 1 Operational amplifiers for modem-to-line interface 1-1: RIN, signal from line to modem 1-2: TXO, signal from modem to line 2 Modem 3 Short pin Mounted on the Turkish versions only. III - 18
  • Brother International IntelliFax-3550 | Service Manual - Page 38
    Signal input from the toner sensor 1-10: Signal input from the heater thermister 1-11: Signal input from the toner thermister 2 Heater supply 4 Main motor driver which controls recording paper feeding and drum rotation. 5 Fan 2 driver circuit 6 Paper pull-in solenoid circuit 7 Scanner motor driver
  • Brother International IntelliFax-3550 | Service Manual - Page 39
    2-1 2 1 2-2 Main PCB Circuit Diagram 6/7 1 Centronics parallel interface circuitry (for the MFC4450/4550/4550plus/6550MC/ 7550MC/7650MC/9000/9500) Connector P15 is compatible with the standard Centronics parallel interface. 2 Backup circuit for the calendar clock of the control panel 2-1: For
  • Brother International IntelliFax-3550 | Service Manual - Page 40
    1 3 2-1 2 3-1 2-2 2-3 2-4 2-7 2-5 2-6 4-2 4-1 3-2 4 Main PCB Circuit Diagram 7/7 1 Connector for the NCU PCB CMLL: NCU relay ON/OFF signal PLS: Dial pulse output TLOF: Off-hook signal which is active Low for the external telephone. CI: Call signal which is active Low. TXD: Line
  • Brother International IntelliFax-3550 | Service Manual - Page 41
    2 Switching devices that are controlled by the ASIC 2-1: Device TEL. If 0, the equipment works as a telephone; if 1, it sends a facsimile message. 2-2: Device HSPLY. If 0, the equipment works as a telephone; if 1, it plays back a TAD recorded message. 2-3: Device TADH. If 0, the equipment works
  • Brother International IntelliFax-3550 | Service Manual - Page 42
    circuit 3 Sheet feeder cover sensor (PC2) circuit 4 Cover switch (SW1) 5 Connector for the high-voltage power supply PCB 6 Connector for the toner sensor PCB 7 Connector for the laser diode of the laser unit 8 Switching circuit which feeds 24V power to the polygon motor during the printing pro- cess
  • Brother International IntelliFax-3550 | Service Manual - Page 43
    3.4 NCU PCB The NCU PCB switches the communications line to telephone or built-in MODEM, under the control of the main PCB. 12 3 4 6 2 9 7 8 : 5 A 2 NCU PCB Circuit Diagram (U.S.A. versions) 1 Surge absorber 2 Noise filters 3 Line relay (CML relay) 4 Line transformer 5 Circuit related to
  • Brother International IntelliFax-3550 | Service Manual - Page 44
    2 12 2 2 2 2 : 2 8 3 B 3 9 A 4 5 6 C 7 NCU PCB Circuit Diagram (European versions) 1 Surge absorber 2 Noise filters 3 Line relay (CML relay) 4 Line transformer 5 Circuit related to the line transformer 6 High-impedance transformer circuit 7 Calling signal detector 8 Loop current detector 9
  • Brother International IntelliFax-3550 | Service Manual - Page 45
    shared by facsimile and telephone units) is to switch a line to the facsimile unit or to the telephone, which calling signal and tells it to the CPU in the FAX engine (ASIC). • The circuit related to a line to be invariant by selecting the constants of the parts in this circuit so as to conform to
  • Brother International IntelliFax-3550 | Service Manual - Page 46
    main PCB communicate with each other by serially transmitting commands and data. The control panel unit consists of a gate array, an LCD, and LEDs, which are controlled by the gate array according to commands issued from the FAX engine on the main PCB. The calendar clock is backed up by the backup
  • Brother International IntelliFax-3550 | Service Manual - Page 47
    uses the switching regulation system to generate DC power (+5V and +24V) from a commercial AC power supply for the driver circuits. The +5V source is fed to the logic, control panel, sensors, CCD unit, etc.; the 24V source is fed to the motors, solenoid, fans, LED array, and the high-voltage power
  • Brother International IntelliFax-3550 | Service Manual - Page 48
    sources from the 24V source fed from the low-voltage power supply for charging, developing, and transferring in the laser printing process. (-3.0µA) B51 Q51 OUT1 OUT2 OUT3 Transfer Roller Developer Roller Laser-sensitive Drum Cleaner Roller Grid Corona Wire 9 Control 3B (TENL TESHAL) 12 GND
  • Brother International IntelliFax-3550 | Service Manual - Page 49
    CHAPTER IV. DISASSEMBLY/REASSEMBLY AND LUBRICATION
  • Brother International IntelliFax-3550 | Service Manual - Page 50
    Frame ASSY IV-10 1.9 Insulation Cover IV-12 1.10 Fixing Unit, FU Lamp, and Paper Ejection Sensor Actuator IV-13 1.11 Laser Unit IV-15 1.12 Bottom Plate IV-16 1.13 Low-voltage Power Supply PCB IV-17 1.14 High-voltage Power Supply PCB and Fan 1 IV-18 1.15 Main PCB IV-19 1.16
  • Brother International IntelliFax-3550 | Service Manual - Page 51
    creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) Always unplug the power cord before replacing parts or units. When having access to the power supply, be sure to unplug the power cord from the power outlet. (2) When servicing the optical
  • Brother International IntelliFax-3550 | Service Manual - Page 52
    Hook switch PCB Panel rear cover Inner cover Scanner motor Fixing unit Laser unit Toner sensor PCB Bottom plate (On the main shield bracket) (On the gear drive unit) Grounding wire Low-voltage power supply PCB High-voltage power supply PCB Interface plate Relay PCB Shield bracket NCU PCB ASSY Drive
  • Brother International IntelliFax-3550 | Service Manual - Page 53
    the paper tray, and - the drum unit (with the toner cartridge loaded). Handset and curled cord Drum unit (with toner cartridge loaded) Wire extension Document tray Paper (F in this case). You should remove parts numbered 1, 3, B, and E so as to access the relay PCB. • Unless
  • Brother International IntelliFax-3550 | Service Manual - Page 54
    11 Laser unit 13 Low-voltage power supply PCB 12 Bottom plate 14 15 High-voltage power supply PCB Main PCB 14 Fan 1 16 Relay PCB 18 Gear drive unit Main motor ASSY 5 Panel rear cover - Document pressure bar - ADF parts - Nip-related parts Control panel - Control panel PCB - FPC key 6
  • Brother International IntelliFax-3550 | Service Manual - Page 55
    1.1 Top Cover (1) Open the top cover. (2) Push the arm of the top cover outwards with your thumb to unhook it from the main cover. (3) Turn the top cover upright and slide it to the rear. Top cover Top cover turned upright Arm Main cover 1.2 Handset Mount and Hook Switch PCB (for handset-equipped
  • Brother International IntelliFax-3550 | Service Manual - Page 56
    1.3 Multi-purpose Sheet Feeder (1) Pull either one of the right and left tabs provided on the main cover outwards and slightly lift up the multi-purpose sheet feeder, then release the other end of the sheet feeder also. (2) Take up the sheet feeder. Multi-purpose sheet feeder Tab on the main cover
  • Brother International IntelliFax-3550 | Service Manual - Page 57
    1.5 Panel Rear Cover and Control Panel (1) Place the control panel ASSY upside down. (2) Remove the document pressure bar, ADF parts, and nip-related parts from the panel rear cover. (3) Remove the two screws from the panel rear cover. (4) While lifting up the front edge of the panel rear cover,
  • Brother International IntelliFax-3550 | Service Manual - Page 58
    1.6 Document Feed Roller ASSY and Ejection Roller ASSY (1) Push arm rib "A" to the rear, then shift the document feed roller ASSY to the right and upwards. (2) Push arm rib "B" to the rear, then shift the document ejection roller ASSY to the right and upwards. Document feed roller ASSY Document
  • Brother International IntelliFax-3550 | Service Manual - Page 59
    s Reassembling Notes • Before putting the inner cover on the main cover, make sure that: - The control panel locks (leaf springs) are set in the inner cover as shown on the previous page. - The pinch rollers are set with their fringes facing outwards as shown on the previous page. - The main-panel
  • Brother International IntelliFax-3550 | Service Manual - Page 60
    1.8 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 main cover: • Cover PC1: Document front sensor PC2: Document rear sensor IV - 10 (Front) Bar lens and LED array CCD unit (Do not remove) Ejection leaf springs
  • Brother International IntelliFax-3550 | Service Manual - Page 61
    the motor, then take out the ASSY. NOTE: Take care not to scratch the mirrors (see the illustration below), CCD unit, or bar lens. NOTE: NEVER remove or replace the CCD unit. Its mounting position has been adjusted in the factory. Main-sensor harness Clamps Cover glass (Remove before taking out the
  • Brother International IntelliFax-3550 | Service Manual - Page 62
    s Reassembling Notes • Check that the mirrors and cover glass are not stained. Wipe them with a soft cloth if necessary. • If you have disassembled the gear train on the right side of the scanner frame ASSY, reassemble it referring to the illustration below. Separation roller gear Document take-in
  • Brother International IntelliFax-3550 | Service Manual - Page 63
    the heater thermister harness from the eraser lamp board. Fixing unit "a" "b" Paper ejection sensor actuator "b" Eraser lamp board cover. (4) To take out the FU lamp from the fixing unit, remove the two screws "b" from the fixing unit. (5) Unhook the two latches outwards with the tip of a
  • Brother International IntelliFax-3550 | Service Manual - Page 64
    edge of the wire into the folded lock plate. Folded lock plate Unhooking the latch s Reassembling Notes • When setting the FU lamp into the fixing unit, be sure to insert the right edge of the wire into the folded lock plate. • When installing the paper ejection sensor actuator, hook the spring
  • Brother International IntelliFax-3550 | Service Manual - Page 65
    the following three things from the relay PCB: • Laser diode harness (5-pin) • Polygon motor flat cable (5-pin) • Toner sensor harness (4-pin) NOTE: When handling the laser unit, take care not to touch the inside of the unit, glass, or mirror. On the small PCB at the right side of the laser
  • Brother International IntelliFax-3550 | Service Manual - Page 66
    1.12 Bottom Plate (1) Make sure that the drum unit, top cover, and multi-purpose sheet feeder have been removed. (2) Turn the machine upside down. (3) Remove the nine screws. (4) Slightly lift up the bottom plate and disconnect the grounding wire. Screws (Taptite, cup S3x6) Screws (Taptite, cup
  • Brother International IntelliFax-3550 | Service Manual - Page 67
    Main PCB Low-voltage power supply PCB Relay PCB High-voltage power supply PCB Gear drive unit Fan 1 (Front) (1) Remove the screw from the low-voltage power supply PCB. (2) Slightly lift up the low-voltage power supply PCB and pull out the power switch support. (3) Disconnect the main-low-voltage
  • Brother International IntelliFax-3550 | Service Manual - Page 68
    down) Drum grounding harness (Front) Eraser harness Fan motor film Fan 1 s Reassembling Notes • Before reinstalling the high-voltage power supply PCB, check the high-voltage contacts for any toner particles, paper dust or dirt, and clean them out. • When reassembling the above parts, make
  • Brother International IntelliFax-3550 | Service Manual - Page 69
    1.15 Main PCB (1) Remove the three screws from the interface plate. (2) Pull out the interface plate to the rear of the machine and take out the main PCB from the shield bracket. (3) Slightly lift up the main PCB and disconnect the following ten harnesses: • Main motor harness (4-
  • Brother International IntelliFax-3550 | Service Manual - Page 70
    s Reassembling Notes • When reinstalling the main PCB, make sure that the harnesses are routed on the main cover as illustrated in Section 1.23. • For the MFC6550MC/7550MC/7650MC/9500 which has a nickel-hydrogen battery on the main PCB, be sure to remove the battery from the PCB when transporting
  • Brother International IntelliFax-3550 | Service Manual - Page 71
    cable (5-pin), P2 • Relay-high-voltage flat cable (12-pin), P1 Shield bracket This corner should come directly under the shield bracket. Relay PCB "X" Toner sensor harness Laser diode harness P4 P2 PC1 P3 PC2 P1 SW1 Relay-high-voltage flat cable Laser diode harness Polygon motor flat cable
  • Brother International IntelliFax-3550 | Service Manual - Page 72
    1.17 Shield Bracket and NCU PCB ASSY (1) Remove the three screws and take out the shield bracket. Shield bracket NCU PCB ASSY (Rear) Main cover (placed upside down) (2) Remove the screw and take out the NCU PCB ASSY. For the MFC9500, disconnect the microphone harness from the NCU PCB. NCU PCB
  • Brother International IntelliFax-3550 | Service Manual - Page 73
    cover (Rear) Relay PCB Main cover (placed upside down) (3) Remove the three screws and take out the gear drive unit. Gear drive unit Drum grounding harness (from the high-voltage power supply PCB) Solenoid harness (from the main PCB) Main motor harness (from the main PCB) (Rear) IV - 23 Main
  • Brother International IntelliFax-3550 | Service Manual - Page 74
    motor Solenoid spring Solenoid lever Clutch release lever Solenoid spring Clutch spring Motor bracket Clutch release lever Solenoid lever Gear drive unit Gear 20/94 Pull-in roller drive gear Intermediate gear Clutch gear Planetary gear system Paper feed solenoid s Reassembling Notes • If
  • Brother International IntelliFax-3550 | Service Manual - Page 75
    1.19 Duct Cover, Fan 2, and Speaker (1) Unhook the three latches of the duct cover and lift it up. Take out the fan 2. (2) Unhook the latch and lift up the speaker. Latch Contrast adjuster Duct cover Fan 2 Latches Speaker (Front) Latch Main cover (placed upside down) s Reassembling Notes •
  • Brother International IntelliFax-3550 | Service Manual - Page 76
    1.20 Sheet Feeder Cover Sensor Actuator, Registration Sensor Actuator, and Cover Sensor Actuator (1) Pull up the sheet feeder cover sensor actuator. (2) Pull up the registration sensor actuator. (3) Unhook the spring and take out the cover sensor actuator. Registration sensor actuator Sheet feeder
  • Brother International IntelliFax-3550 | Service Manual - Page 77
    1.21 Microphone (MFC9500 only) (1) Disconnect the microphone harness from the NCU PCB and remove the NCU PCB ASSY. (Refer to Section 1.17.) (2) Turn the equipment rightside up. (3) Lift up the microphone from the main cover. Boss Main cover (placed rightside up) Microphone (Front) s
  • Brother International IntelliFax-3550 | Service Manual - Page 78
    flows correctly to enable printing. Grounding Contacts High-voltage Contacts 2 1 3 For transfer roller Gear drive unit Drum grounding board 2 1 2 Drum unit 4 For cleaner roller 5 For grid 7 For developer roller 6 For corona wire High-voltage power supply PCB 3 4 1 IV - 28 7 6 5 4 3 5 7 6
  • Brother International IntelliFax-3550 | Service Manual - Page 79
    motor harness Microphone harness (MFC9500 only) Polygon motor flat cable Toner sensor harness Heater harness Hook switch harness Solenoid harness Speaker harness Relay-high- High-voltage Eraser Drum voltage flat power supply harness grounding cable PCB harness Fan 1 harness (Front) Main
  • Brother International IntelliFax-3550 | Service Manual - Page 80
    2. LUBRICATION Apply Molykote EM-30L to the lubrication points as illustrated below. For points A, apply a bean-sized pinch of grease (12 mm3). For points B, apply a rice-sized pinch of grease (6 mm3). A [ 1 ] Inner cover Document feed roller ASSY B B A A AA A Document ejection roller ASSY
  • Brother International IntelliFax-3550 | Service Manual - Page 81
    CHAPTER V. MAINTENANCE MODE
  • Brother International IntelliFax-3550 | Service Manual - Page 82
    CONTENTS 1. ENTRY INTO THE MAINTENANCE MODE V-1 2. LIST OF MAINTENANCE-MODE FUNCTIONS V-2 3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS ......... V-4 3.1 E2PROM Parameter Initialization V-4 3.2 Scanning Compensation Data Initialization V-5 3.3 Printout of Scanning Compensation Data V-6
  • Brother International IntelliFax-3550 | Service Manual - Page 83
    1. ENTRY INTO THE MAINTENANCE MODE To make the facsimile equipment enter the maintenance mode, press the Function , * , 2 , 8 , 6 , and 4 keys in this order. Within 2 seconds The equipment beeps for approx. 3 seconds and displays "MAINTENANCE" on the LCD, indicating that it is placed in the initial
  • Brother International IntelliFax-3550 | Service Manual - Page 84
    2. LIST OF MAINTENANCE-MODE FUNCTIONS Function Code 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 Maintenance-mode Functions Function E2PROM Parameter Initialization Scanning Compensation Data Initialization Printout of Scanning Compensation Data ADF* Performance Test Test Pattern 1 Firmware Switch
  • Brother International IntelliFax-3550 | Service Manual - Page 85
    user-accessible selectors which are shaded in the firmware switch tables in Subsection 3.6. The service personnel should instruct end users Dial 0 Voice Fax status Fine Fax Photo S.Fine F/ T Tel-index Resolution Mode SIX IN ONE FAX PRINTER COPIER SCANNER PC FAX MESSAGE CENTER Coverpage
  • Brother International IntelliFax-3550 | Service Manual - Page 86
    the E2PROM areas, but entering 91 does not initialize some areas, as listed below. Function code Data item Maintenance-mode functions User switches Firmware switches Remote activation code Activity report Distinctive ringing patterns registered (only for the U.S.A. versions) Station ID data Cover
  • Brother International IntelliFax-3550 | Service Manual - Page 87
    3.2 Scanning Compensation Data Initialization s Function The equipment scans the white pressure bar and writes the scanned compensation data onto the E2PROM, so said data can be used for compensation of individual CCD properties in the scanning operation. s Operating Procedure (1) Press the 0 and 2
  • Brother International IntelliFax-3550 | Service Manual - Page 88
    3.3 Printout of Scanning Compensation Data s Function The equipment prints out the white and black level data for scanning compensation. s Operating Procedure Do not start this function merely after powering on the equipment but start it after carrying out a sequence of scanning operation. Unless
  • Brother International IntelliFax-3550 | Service Manual - Page 89
    Scanning Compensation Data List (200 dpi) V - 7
  • Brother International IntelliFax-3550 | Service Manual - Page 90
    3.4 ADF Performance Test s Function The equipment counts the documents fed by the automatic document feeder (ADF) and displays the count on the LCD for checking the ADF performance. s Operating Procedure (1) Set documents. (Allowable up to the ADF capacity.) The "DOC. READY" will appear on the LCD.
  • Brother International IntelliFax-3550 | Service Manual - Page 91
    3.5 Test Pattern 1 s 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. s Operating Procedure Press the 0 and 9 keys in this order in the initial maintenance mode. The
  • Brother International IntelliFax-3550 | Service Manual - Page 92
    3.6 Firmware Switch Setting and Printout [ A ] Firmware switch setting s Function The facsimile equipment incorporates the following firmware switch functions (WSW01 through WSW34) which may be activated with the procedures using the control panel keys and buttons. The firmware switches have been
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    minute after a single-digit number is entered for double-digit firmware switch numbers, the equipment will automatically return to the initial maintenance mode. s Note The user-accessible selectors of the firmware switches are shaded in the tables given on the following pages. V - 11
  • Brother International IntelliFax-3550 | Service Manual - Page 94
    s Detailed Description for the Firmware Switches WSW01 (Dial pulse setting) Selector No. Function 1 Dial pulse generation mode 2 3 Break time length in pulse 4 dialing Setting and Specifications No. 1 2 00 : 01 : 10 : 11 : N N+1 10-N N No. 3 4 00 : 01 : 10 : 11 : 60 ms 67 ms 40 ms (for
  • Brother International IntelliFax-3550 | Service Manual - Page 95
    (PB) dialing This selector sets the default dialing mode (pulse dialing or tone dialing) which may be changed by the function switch. If the user switches it with the function switch when selector 7 is set to "0," the setting specified by this selector will be also switched automatically. WSW02
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    1st dial tone detection * PABX: Private automatic branch exchange NOTE: The WSW03 is not applicable in those countries where no PABX is supported, e.g., U.S.A. q Selectors 2 through 4: Min. detection time length of PABX dial tone, required for starting dialing Upon detection of the PABX dial tone
  • Brother International IntelliFax-3550 | Service Manual - Page 97
    1 : 110 ms 1 0 : 250 ms 1 1 : 500 ms NOTE: Selectors 1 and 5 through 8 are not applicable in those countries where no transfer facility is supported. Selectors 2 and 3 are applicable to those models equipped with a built-in TAD or in the U.S.A. q Selector 1: Earth function in transfer facility This
  • Brother International IntelliFax-3550 | Service Manual - Page 98
    0: 40 ms min. 1: 100 ms min. NOTE: Selectors 5 through 7 are not applicable in those countries where no busy tone detection is supported, e.g., U.S.A. q Selectors 1 through 3: 1st dial tone detection These selectors activate or deactivate the 1st dial tone detection function which detects the 1st
  • Brother International IntelliFax-3550 | Service Manual - Page 99
    q Selectors 5 and 6: Busy tone detection in automatic sending mode These selectors determine whether or not the equipment automatically disconnects a line upon detection of a busy tone in automatic sending mode. Setting selector 6 to "0" ignores a busy tone so that the equipment does not disconnect
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    time 0: Once 0: 30 ms 1: Twice 1: 50 ms NOTE: Selectors 4 through 8 are not applicable in those countries where no dial tone detection is supported, e.g., U.S.A. q Selectors 1 through 3: PAUSE key setting and 2nd dial tone detection Selectors 123 0 0 0 No WAIT is inserted even if the PAUSE key
  • Brother International IntelliFax-3550 | Service Manual - Page 101
    is activated by selectors 1 through 3 (Setting 1, 1, 0 or 1, 1, 1). This function does not apply in those countries where no dial tone detection function is supported. q Selector 7: No. of 2nd dial tone detection times This selector sets the number of dial tone detection times required for starting
  • Brother International IntelliFax-3550 | Service Manual - Page 102
    33 dBm -36 dBm -39 dBm -42 dBm 0: 30 ms 1: 50 ms NOTE: WSW07 is not applicable in those countries where no dial tone is supported, e.g., U.S.A. q Selectors 1 and 2: Frequency band range These selectors set the frequency band for the 1st dial tone and the busy tone (before dialing) to be detected
  • Brother International IntelliFax-3550 | Service Manual - Page 103
    dBm -30 dBm -33 dBm -36 dBm -39 dBm -42 dBm NOTE: WSW08 is not applicable in those countries where no dial tone detection is supported, e.g., U.S.A. q Selectors 1 through 3: 1st dial tone detection time length Upon detection of the 1st dial tone for the time length set by these selectors, the
  • Brother International IntelliFax-3550 | Service Manual - Page 104
    WSW09 (Protocol definition 1) Selector No. 1 2 Function Frame length selection Not used. 3 No. of retries 4 5 T5 timer 6 T1 timer Elapsed time for time-out 7 control for no response from the called station in automatic 8 sending mode Setting and Specifications 0: 256 octets 1: 64
  • Brother International IntelliFax-3550 | Service Manual - Page 105
    WSW10 (Protocol definition 2) Selector No. 1 2 3 4 Function Switching of DPS, following the CML ON/OFF Time length from transmission of the last dial digit to CML ON Time length from CML ON to CNG transmission Time length from CML ON to CED transmission (except for facsimile-to-telephone switching
  • Brother International IntelliFax-3550 | Service Manual - Page 106
    110-410/320-550 ms 1: 100-660/100-660 ms NOTE: WSW11 is not applicable in those countries where no busy tone detection is supported, e.g., U.S.A. The setting of WSW11 is effective only when selectors 5 and 6 of WSW05 are set to "0, 1" or "1, 1" (Busy tone detection). q Selectors 1 and 2: Frequency
  • Brother International IntelliFax-3550 | Service Manual - Page 107
    Selector No. 1 2 3 4 5 6 7 8 WSW12 (Signal detection condition setting) Function Min. OFF time length of calling signal (Ci) Max. OFF time length of calling signal (Ci) Detecting time setting Delay Not used. Setting and Specifications No. 1 2 00 : 01 : 10 : 11 : No. 3 4 00 : 01 : 10 : 11 : No. 5
  • Brother International IntelliFax-3550 | Service Manual - Page 108
    : -51 dBm 5 | Modem attenuator 8 0: 0 dB 0: 0 dB 0: 0 dB 0: 0 dB 1: 8 dB 1: 4 dB 1: 2 dB 1: 1 dB The modem should be adjusted according to the user's line conditions. q Selectors 1 and 2: Cable equalizer These selectors are used to improve the pass-band characteristics of analogue signals on
  • Brother International IntelliFax-3550 | Service Manual - Page 109
    WSW14 (AUTO ANS facility setting) Selector No. Function 1 Frequency band selection 2 (Lower limit) 3 Frequency band selection 4 (Upper limit) 5 | No. of rings in AUTO ANS mode 8 Setting and Specifications No. 1 2 00 : 01 : 10 : 11 : 13 Hz 15 Hz 23 Hz 20 Hz No. 3 4 00 : 01 : 10 : 11
  • Brother International IntelliFax-3550 | Service Manual - Page 110
    WSW15 (REDIAL facility setting) Selector No. Function 1 Selection of redial interval 2 3 | No. of redialings 6 7 8 Not used. Setting and Specifications No. 1 2 00 : 01 : 10 : 11 : 5 minutes 1 minute 2 minutes 3 minutes No. 3 4 5 6 0 0 0 0 : 16 times 0 0 0 1 : 1 time 0 0 1 0 : 2 times
  • Brother International IntelliFax-3550 | Service Manual - Page 111
    sharing a modular wall socket with the equipment, as well as from the directly connected external telephone. If any of the following problems occurs frequently, set this selector to "0": • Dialing from any of the telephones sharing a modular wall socket starts the facsimile equipment. • Picking
  • Brother International IntelliFax-3550 | Service Manual - Page 112
    WSW17 (Function setting 2) Selector No. Function 1 Off-hook alarm 2 3 Power failure report output 4 Calender clock/prompt alternate display 5 Calendar clock type 6 Error indication in activity report 7 Non-ring reception 8 Not used. Setting and Specifications No. 1 2 00 : 01 : 1X :
  • Brother International IntelliFax-3550 | Service Manual - Page 113
    WSW18 (Function setting 3) Selector No. 1 Function Not used. 2 Detection enabled time for CNG 3 and no tone 4 5 Not used. 6 Registration of station ID Setting and Specifications No. 2 3 00 01 10 11 40 sec. 0 sec. (No detection) 5 sec. 80 sec. 0: Permitted 1: Prohibited 7 Tone sound
  • Brother International IntelliFax-3550 | Service Manual - Page 114
    WSW19 (Transmission speed setting) Selector No. Function 1 | First transmission speed choice for fallback 3 4 | Last transmission speed choice for fallback 6 Setting and Specifications No. 1 2 3 No. 4 5 6 000 : 001 : 010 : 011 : 100 : 101 : 110 : 111 : 2,400 bps 4,800 bps 7,200 bps 9,
  • Brother International IntelliFax-3550 | Service Manual - Page 115
    WSW20 (Overseas communications mode setting) Selector No. 1 2 Function EP* tone prefix Overseas communications mode (Reception) 3 Overseas communications mode (Transmission) 4 Min. time length from reception of CFR to start of transmission of 5 video signals 6 Chattering elimination for
  • Brother International IntelliFax-3550 | Service Manual - Page 116
    WSW21 (TAD setting 1) Selector No. Function 1 | Max. waiting time for voice signal 5 6 Two-way recording 7 Erasure of message stored in 8 the memory after the message transfer Setting and Specifications No. 1 2 3 4 5 0 0 0 0 0 : No detection 0 0 0 0 1 : 1 sec. 0 0 0 1 0 : 2 sec. 0 0
  • Brother International IntelliFax-3550 | Service Manual - Page 117
    WSW23 (Communications setting 2) Selector No. 1 Function Starting point of training check (TCF) 2 Allowable training error rate 3 4 Decoding error rate for trans- 5 mission of RTN Setting and Specifications 0: From the head of a series of zeros 1: From any arbitrary point No. 2 3 00 : 01 :
  • Brother International IntelliFax-3550 | Service Manual - Page 118
    q Selector 7: Resolution level for reception This selector determines whether the resolution should be limited at the start of reception in the sleep mode. q Selector 8: Limitation of attenuation level Setting this selector to "0" limits the transmitting level of the modem to 10 dB. This setting has
  • Brother International IntelliFax-3550 | Service Manual - Page 119
    WSW25 (TAD setting 3) Selector No. 1 | 4 Function Not used. 5 Pause between paging number | and PIN 7 Setting and Specifications No. 5 6 7 000 : 001 : 010 : 011 : 100 : 101 : 110 : 111 : 2 sec. 4 sec. 6 sec. 8 sec. 10 sec. 12 sec. 14 sec. 16 sec. Automatic shift to facsimile 8 message
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    WSW26 (Function setting 4) Selector No. Function 1 | Not used. 3 Setting and Specifications No. 4 5 No. of CNG cycles to be detected 4 0 0 : No detection (OFF) (when the line is connected via the 01 : 1 (B) 5 external telephone except in the 1 0 : 1.5 (C) external TAD mode) 11 : 2
  • Brother International IntelliFax-3550 | Service Manual - Page 121
    of OGM at the start time of OGM ON mode Detection of distinctive ringing pattern Automatic erasure of voice alarm Not used. Toner save mode. Setting and Specifications 0: TEL key 0: YES 1: TEL/POLLING key 1: NO 0: OFF 1: ON 0: OFF 0: YES 1: ON 1: NO 0: YES 1: NO q Selector 1: Definition
  • Brother International IntelliFax-3550 | Service Manual - Page 122
    WSW28 (Function setting 6) Selector No. Function 1 2 Transmission level of DTMF high-band frequency signal 3 4 5 Transmission level of DTMF low-band frequency signal 6 Setting and Specifications No. 1 2 3 000 : 001 : 010 : 011 : 100 : 101 : 110 : 111 : 0 dB +1 dB +2 dB +3 dB 0 dB -1 dB
  • Brother International IntelliFax-3550 | Service Manual - Page 123
    WSW29 (Function setting 7) Selector No. 1 | 7 8 Function Not used. Beep at the time of full activity report data Setting and Specifications 0: No 1: Yes q Selector 8: Beep at the time of full activity report data (for the European versions only) If this selector is set to "1," the equipment
  • Brother International IntelliFax-3550 | Service Manual - Page 124
    WSW30 (Function setting 8) Selector No. Function 1 Detection level of dial tone or 2 busy tone for the built-in TAD operation 3 4 Not used. 5 Speaker output level 6 Cooling fan control mode 7 8 Not used. Setting and Specifications No. 1 2 3 0 0 0 : -38.0 dBm (A) 0 0 1 : -39.5 dBm (B)
  • Brother International IntelliFax-3550 | Service Manual - Page 125
    WSW31 (Function setting 9) Selector No. Function Setting and Specifications 1 Not used. Default reduction rate for failure 2 of automatic reduction during recording 3 4 Not used. 5 Minimum short-OFF duration in distinctive ringing 6 | Not used. 8 0: 100% 1: 50% 0: 130 ms 1: 90 ms
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    WSW33 (Function setting 11) Selector No. Function 1 Detection threshold level for | voice signals inputted via the network in the built-in TAD 3 operation 4 First communications speed 5 choice for PCI 6 Report output of polled transmission requests 7 8 Not used. Setting and
  • Brother International IntelliFax-3550 | Service Manual - Page 127
    WSW34 (Function setting 12) Selector No. Function 1 ICM recording time to be erased preceding the tone detection | when the equipment automatically 3 disconnects the line because no voice signal has been received 4 5 Not used. 6 Number of DTMF tone signals for inhibiting the detection
  • Brother International IntelliFax-3550 | Service Manual - Page 128
    [ B ] Printout of firmware switch data s Function The equipment prints out the setting items and contents specified by the firmware switches. s Operating Procedure (1) Press the 1 key twice in the initial maintenance mode. The "PRINTING" will appear on the LCD. (2) The equipment prints out the
  • Brother International IntelliFax-3550 | Service Manual - Page 129
    To terminate this operation, press the Stop key. The equipment returns to the initial maintenance mode. FAX3550/3650/8000P/8200P 3550 Set Function Clear Tel-index Fine Fax Photo TAD S.Fine F/ T Resolution Mode Super Q.Scan Help Enlarge / Reduce Hook ABC DEF 123 01 02 03 04 05
  • Brother International IntelliFax-3550 | Service Manual - Page 130
    Speed Dial 0 Voice Fax status Fine Fax Photo S.Fine F/ T Tel-index Resolution Mode SIX IN ONE FAX PRINTER COPIER SCANNER PC FAX MESSAGE CENTER Coverpage Super top cover, jam paper at the paper outlet, remove the toner cartridge, and lift up the handset), and then check that the
  • Brother International IntelliFax-3550 | Service Manual - Page 131
    code for the last error on the LCD. s Operating Procedure (1) Press the 8 and 2 keys in this order in the initial maintenance mode. The LCD shows "MACHINE ERROR XX." (2) To stop this operation and return the equipment to the initial maintenance mode, press the Stop key. V - 49
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    It allows the service personnel to receive the transmission log of the user's equipment at a remote location and use it for analyzing problems arising in the user's equipment. s Operating Procedure (1) If the user's equipment has a transmission-related problem, call the user's equipment at a remote
  • Brother International IntelliFax-3550 | Service Manual - Page 133
    CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING
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    LCD VI-1 [ 2 ] Error codes shown in the "MACHINE ERROR xx" message ...... VI-3 1.2 Communications Errors VI-5 2. TROUBLESHOOTING VI-12 2.1 Introduction VI-12 2.2 Precautions VI-12 2.3 Checking prior to Troubleshooting VI-12 2.4 Troubleshooting Procedures VI-13 [ 1 ] Control panel related VI
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    ERROR INDICATION To help the user or the service personnel promptly locate the cause of a problem (if any), the facsimile . For the error messages, see [ 1 ] below. As one of the error messages, "MACHINE ERROR xx" includes an error code which indicates the detailed error causes listed in [ 2 ].
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    Messages on the LCD DOCUMENT JAM CLEAN UP SCANNER SCANNER ERROR CHANGE TONER TONER EMPTY CHANGE TONER SET CARTRIDGE COOLING DOWN PLEASE WAIT MACHINE ERROR XX Probable Cause s Document loading error (1) The document rear sensor detects no leading edge of a document within 10 seconds from the start
  • Brother International IntelliFax-3550 | Service Manual - Page 137
    does not lock. Cannot detect Beam Detect signal. No toner cartridge loaded. Toner empty. In-house temperature error. Fixing heater harness disconnected is not detected.) Error codes in parentheses do not appear in the "MACHINE ERROR xx", since those errors are displayed as messages described in "[
  • Brother International IntelliFax-3550 | Service Manual - Page 138
    . EOL not found in page memory transmission mode. Interface error of page memory command. Error codes in parentheses do not appear in the "MACHINE ERROR xx", since those errors are displayed as messages described in "[ 1 ] Error messages on the LCD." Those error codes appear in the communications
  • Brother International IntelliFax-3550 | Service Manual - Page 139
    1.2 Communications Errors If a communications error occurs, the facsimile equipment (1) emits an audible alarm (intermittent beeping) for approximately 4 seconds, (2) displays the corresponding error message, and (3) prints out the transmission verification report if the equipment is in sending
  • Brother International IntelliFax-3550 | Service Manual - Page 140
    s Definition of Error Codes on the Communications List (1) Calling Code 1 10 11 11 11 11 11 11 11 Code 2 08 01 02 03 05 06 07 10 Causes Wrong number called. No dial tone detected. Busy tone detected before dialing. 2nd dial tone not detected. No loop current detected. * Busy tone detected after
  • Brother International IntelliFax-3550 | Service Manual - Page 141
    remote terminal. 32 14 The available memory space of the remote terminal is less than that required for reception of the confidential or relay broadcasting instruction. VI - 7
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    (4) Instructions received from the remote terminal [checking the NSC, DTC, NSS, and DCS] Code 1 40 40 Code 2 02 03 Causes Illegal coding system requested. Illegal recording
  • Brother International IntelliFax-3550 | Service Manual - Page 143
    (6) ID checking Code 1 63 63 63 63 63 63 Code 2 01 02 03 04 05 06 Causes Password plus "lower 4 digits of telephone number" not coincident. Password not coincident. Polling ID not coincident. Entered confidential mail box ID uncoincident with the mail box ID. Relay broadcasting ID not coincident.
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    (9) Signal isolation Code 1 90 Code 2 01 90 02 Causes Unable to detect video signals and commands within 6 seconds after CFR is transmitted. Received PPS containing invalid page count or block count. (10) Video signal reception Code 1 A0 Code 2 03 A0 11 A0 12 A0 13 A0 14 A0 15 A0
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    (12) Maintenance mode Code 1 E0 E0 E0 Code 2 01 02 03 Causes Failed to detect 1300 Hz signal in burn-in operation. Failed to detect PB signals in burn-in operation. Failed to detect any command from the RS-232C interface in burn-in operation. (13) Equipment error Code 1 FF Code 2 XX Causes
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    the troubleshooting procedures, so this section covers some sample problems. However, those samples will help service personnel pinpoint and repair other defective elements if he/she analyzes and examines them well. 2.2 Precautions Be sure to observe the following to prevent the secondary troubles
  • Brother International IntelliFax-3550 | Service Manual - Page 147
    2.4 Troubleshooting Procedures [ 1 ] Control panel related Trouble (1) LCD shows nothing. (2) Control panel inoperative. Check: • Main-panel harness between the main PCB and the control panel PCB • Control panel PCB • Low-voltage power supply PCB • Main PCB • Main-panel harness between the main
  • Brother International IntelliFax-3550 | Service Manual - Page 148
    NCU PCB Check: [ 4 ] Paper/document feeding related Trouble (1) Neither "COPY: PRESS COPY" nor "FAX: NO. & START" message appears although documents are set. Main PCB • ADF parts • Nip-related parts • Multi-purpose sheet feeder • Drum unit • Heat-fixing unit • Gear drive unit • Main PCB VI - 14
  • Brother International IntelliFax-3550 | Service Manual - Page 149
    is normal, the problem may be due to the remote terminal; if it is abnormal, proceed to the following checks: Trouble (1) Completely blank Action high-voltage contacts for the developer roller on the drum unit, main cover, and high-voltage power supply PCB. (Contacts 7 in the illustration given on
  • Brother International IntelliFax-3550 | Service Manual - Page 150
    the problem persists, proceed to the next step. • Remove the toner cartridge and start printing. If printing takes place, clean the toner sensor or replace the toner sensor PCB. • Clean the high-voltage contacts for the transfer roller on the drum unit, main cover, and high-voltage power supply PCB
  • Brother International IntelliFax-3550 | Service Manual - Page 151
    cover glass of the laser unit with a dry soft cloth. • Replace the drum unit. At the printer side • Check the connection of the relay-high-voltage flat cable. • Check the connection between the relay PCB and the main PCB. • Replace the drum unit. • Replace the high-voltage power supply PCB. VI - 17
  • Brother International IntelliFax-3550 | Service Manual - Page 152
    not to load paper exceeding the limit mark on the multi-purpose sheet feeder. • Instruct the user to use the recommended types of paper. • Replace the multi-purpose sheet feeder. • Replace the gear drive unit. (10) Image distortion or improper image alignment In communications Check the following
  • Brother International IntelliFax-3550 | Service Manual - Page 153
    the toner cartridge. If the problem persists, replace it. • Check that the equipment is placed on a flat surface. • Shake the drum unit from left to right and front to back. At the printer side • Replace the drum unit. • Replace the heat-fixing unit. (13) Poor fixing At the printer side • Instruct
  • Brother International IntelliFax-3550 | Service Manual - Page 154
    voltage Contacts and Grounding Contacts Grounding Contacts 2 1 High-voltage Contacts 3 For transfer roller Drum unit 4 For cleaner roller 5 For grid 7 For developer roller 6 For corona wire Gear drive unit Drum grounding board 2 1 2 High-voltage power supply PCB 3 4 1 VI - 20 7 6 5 4 3 5 7 6
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    FAX3550/3650/8000P/8200P MFC4450/4550/4550plus/6550MC/7550MC/7650MC MFC9000/9500 APPENDICES Circuit Diagrams A. Main PCB B. Relay PCB C. Network Control Unit (NCU) PCB D. Control Panel PCB E. Power Supply PCB Low-voltage power supply High-voltage power supply
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    1 () C2 0 () C2 4 () C3 3 15p C3 2 15p S0 V R2 7 22K * R1 9 6 22K 5 7 2 9 0 A- 8 8 S0 V S0 V S0 V +5V +5V S0 V 8 P MOD U R1 8 6 B L M1 1 A 2 0 S0 V R5 4550 0 FG R1 0 8 3550 0 FG D D MAIN 1/8 A FAX3550/3650/8000P/8200P MFC4550/6550MC/7550MC MFC9000/9500 1 2 3 4 5 6
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    1 2 3 4 5 6 +5 V S0 V C1 7 CC1 0 4 +5B * C1 0 9 CC1 0 4 S0 V +5B C1 0 7 CC1 0 4 S0 V * R1 7 2 ( ) RAS0 22 12 31 1 14 15 28 * R1 1 2 21 1 6 3 72 2 4 2 * R1 1 7 ABUS A1 10 VCC G G 14 DBUS VCC VCC G G 8 10 RAS0 VCC VCC G G G 10 14 RAS1 A0 A2 9 A1 D0 16 D1 6 NC
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    1 2 3 4 5 6 +24V R5 V P4 SENS L4 B L M1 1 A 2 0 +5V R6 0 100 3 R7 4 0 A 3 R5 7 A 1 2 R1 9 9 1 K L E D 300 14C C1 3 7 CC1 0 2 1 Q1 7 DT D1 1 3 Z K C1 3 9 CC1 0 2 C7 9 104 R5 V R6 1 100 C7 2 CC1 0 4 C6 9 CC1 0 4 2 4 RET 2 4 RET 2 4 RET * R7 9 L L 1 2 1 SH R2 0 2
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    1 2 3 4 5 6 S OV +5V M5 V R6 2 L6 0 0 R7 1 4. 7K AREF C6 5 C1 3 5 100 F/ 10V +5V * +5V R7 0 C8 6 CC1 0 4 R1 6 8 #7 4. 7K CC1 0 4 0 RF X1 4 4 C7 5 MOV M5 V A 25 6 CC1 0 4 M0 V AVDD 35 VAA1 VDD1 58 VDD2 C7 6 A M0 V 45 VAA2 L 77 VDD3 CC1 0 4 16 DGND1 C9 9 82
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    1 2 3 4 5 6 P1 3 CHUKEI +24V 9B 15A S0 V C3 4 +5V CC1 0 3 R1 9 2 4. 7K L OCK 2B 5B R0 V Q1 A SCCK 1 U MG5 N 5 14A SCCKL 4A L VPS +5V 4 A DRI V 3 14A 4 DRI VL 5A +24V 5 S0 V 3 S0 V 2 4 RET 2 14B 15B L DON L ASP 14B T ENH 14B 1 2 3 Q1 1 DT A1 1 4 YK
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    1 2 3 4 5 6 MF C 4 5 5 0 , 6 5 5 0 , 7 5 5 0 A +5V RA4 1 . 0 Kx 4 RA6 2 . 2 Kx 4 RA8 2 . 2 Kx 4 A +5V P1 5 5 7 L E4 0 3 6 0 10 11 12 13 32 31 36 14 1 2 2 6 3 5 4 8 1 5 4 8 1 7 2 6 3 5 4 6 3 7 2 8 1 R7 1 5 0 8 1 6 3 RA5 7 2 100x4 5 4 R6 1 5 0 R8 1 5 0
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    1 2 3 4 5 6 NCU1 +5V +24V 10 12 Q1 8 M5 V +24V M5 V C ML L 8 A 3 DT C1 1 4 YK 2 C ML H 11B R8 7 1 K PL S 3 11B 1 +5V 2 4 RET R8 0 22K R8 1 1K 16 #13 7 4 HC4 0 5 3 678 C1 2 9 CC1 0 4 M0 V 4 #8 KI 3 2 4 11 C9 8 CC5 0 C1 0 4 16 #14 7 4 HC4 0 5 3 678 C1 3 3 CC1 0 4 M0 V
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    MAIN 8/8 A FAX3550/3650/8000P/8200P MFC4550/6550MC/7550MC MFC9000/9500
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    7 C1 9 C5 4 ( C 2 3 ) ( C 2 2 ) ( C 2 1 ) ( C 2 0 ) ( C 2 4 ) C3 3 15p C3 2 15p S0 V R2 7 22K * R1 9 6 22K 5 7 2 9 0 A- 8 8 S0 V S0 V S0 V +5V +5V S0 V 8 P MOD U R1 8 6 B L M1 1 A 2 0 S0 V R5 4550 0 FG R1 0 8 3550 0 FG D D A MAIN 1/7 MFC4450 1 2 3 4 5 6
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    1 2 +5 V S0 V C1 7 CC1 0 4 22 12 31 ABUS VCC G G DBUS A1 10 A0 14 D0 A2 9 A1 16 D1 A3 8 18 A A2 A4 7 D2 20 A3 D3 A5 6 A4 23 D4 A6 5 8 MR OM 25 A5 D5 A7 4 A6 27 D6 A8 3 A7 29 D7 A9 41 A8 15 D8 A1 0 4 0 A9 #4 A1 1 3 9 A1 0 17 D9 19 D1 0 A1 2 3 8 A1
  • Brother International IntelliFax-3550 | Service Manual - Page 166
    1 2 3 4 5 6 +24V R5 V P4 SENS L4 B L M1 1 A 2 0 +5V R6 0 100 3 R7 4 0 A 3 R5 7 A 1 2 R1 9 9 1 K L E D 300 14C C1 3 7 CC1 0 2 1 Q1 7 DT D1 1 3 Z K C1 3 9 CC1 0 2 C7 9 104 R5 V R6 1 100 C7 2 CC1 0 4 C6 9 CC1 0 4 2 4 RET 2 4 RET 2 4 RET R7 9 8 R2 0 2 ( R7 6 ) SH
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    1 2 3 4 5 6 S0 V +5V +5 R6 2 L6 0 0 A A C6 C7 5 C7 6 M0 V M5 V 1 6 V/ 1 0 CC1 0 4 x 2 + - + - S0 V 74C 43C RI N C1 0 0 CC1 0 4 AREF R1 0 6 27K R1 6 6 27K C9 9 ( CC1 0 2 ) R1 0 5 1 2 0 K 13 12 14 #8 KI 3 2 4 R1 0 7 4. 7K PRI NG 74C D9 MZ 5 . 1 B B M0 V S0 V 11
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    1 2 3 4 5 6 P1 3 CHUKEI +24V 9B 15A S0 V C3 4 CC1 0 3 +5V R1 9 2 4. 7K L OCK 2B 5B R0 V Q1 A SCCK 1 U MG5 N 5 14A SCCKL 4A L VPS +5V 4 A DRI V 3 14A 4 DRI VL 5A +24V 5 S0 V 3 S0 V 2 4 RET 2 () () ( )( ) () 14B T ENH 14B 2 R2 0 3 S C D T B L M1 1 A 2 0
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    1 2 3 4 5 6 A +5V RA4 1 . 0 Kx 4 RA6 2 . 2 Kx 4 RA8 2 . 2 Kx 4 1 2 3 4 3 2 1 4 1 4 3 2 P1 5 5 7 L E4 0 3 6 0 10 11 12 13 32 31 36 14 1 9 B 8 7 6 5 4 3 2 16 17 19 20 21 22 23 C 24 25 26 27 28 29 30 S0 V 18 NC 2 6 5 8 5 8 7 6 5 6 7 8 C5 3 C5 2 C5 1 C5 0 C4 9 C4 8 C4
  • Brother International IntelliFax-3550 | Service Manual - Page 170
    1 2 3 4 5 6 NCU1 +5V +24V +24V M5 V 10 4 16 12 Q1 8 #8 KI 3 2 4 C9 8 CC5 0 C1 0 4 #14 7 4 HC4 0 5 3 C1 3 3 CC1 0 4 C ML L 8 A 3 DT C1 1 4 YK 2 C ML H 11B 11 678 SP A R8 7 1 K PL S 3 11B 1 M0 V M0 V L 8 B L M1 1 A 2 0 1 2 R8 0 22K 2 +5V R8 1 1K 2 4 RET T L OF
  • Brother International IntelliFax-3550 | Service Manual - Page 171
    1 2 3 4 5 6 C6 3 C2 9 C2 7 C1 9 C5 4 ( C 2 3 ) ( C 2 2 ) ( C 2 1 ) ( C 2 0 ) ( C 2 4 ) () () 74C RI NGO 76 RI NG 93 SEN5 T ADH 74B 55C HOOK 94 SEN6 65 PA3 FAN 51C 73B TEL 74 TEL 75 S P ON MS I L 53C 47A MC E 39 MC E 29 P M1 P M1 53B L OCK 1 1 3 A B 73C 73B 72C 71C
  • Brother International IntelliFax-3550 | Service Manual - Page 172
    1 2 3 4 5 6 +5V C8 CC1 0 4 S0 V +5B C1 0 7 CC1 0 4 S0 V 37 46 27 2 1 1 6 3 72 2 4 2 R1 7 2 ABUS VCC G G DBUS VCC VCC G G G 200 A1 25 A0 29 D0 14 RAS RAS0 A2 24 A1 31 D1 13 WE R M WR 11B A A3 23 A2 A4 22 A3 A5 21 A4 33 D2 35 D3 38 D4 DBUS D0 D1 2 9 R A MR D
  • Brother International IntelliFax-3550 | Service Manual - Page 173
    1 2 3 4 5 6 +24V R5 V P4 SENS L4 B L M1 1 A 2 0 +5V R6 0 100 3 R7 4 0 A 3 R5 7 A 1 2 R1 9 9 1 K L E D 300 14C C1 3 7 CC1 0 2 1 Q1 7 DT D1 1 3 Z K C1 3 9 CC1 0 2 C7 9 104 R5 V R6 1 100 C7 2 CC1 0 4 C6 9 CC1 0 4 2 4 RET 2 4 RET 2 4 RET * R7 9 L L 1 2 1 SH R2 0 2 *
  • Brother International IntelliFax-3550 | Service Manual - Page 174
    1 2 3 4 5 6 S OV +5V M5 V R6 2 L6 0 0 R7 1 4. 7K AREF C6 5 C1 3 5 100 F/ 6. 3V +5V * +5V R7 0 C8 6 CC1 0 4 R1 6 8 #7 4. 7K CC1 0 4 0 RF X1 4 4 C7 5 MOV M5 V A 25 6 CC1 0 4 M0 V AVDD 35 VAA1 VDD1 58 VDD2 C7 6 A M0 V 45 VAA2 L 77 VDD3 CC1 0 4 16 DGND1 C9 9 82
  • Brother International IntelliFax-3550 | Service Manual - Page 175
    1 2 3 4 5 6 P1 3 CHUKEI +24V 9B 15A S0 V C3 4 CC1 0 3 +5V R1 9 2 4. 7K L OCK 2B 5B R0 V Q1 A SCCK 1 U MG5 N 5 14A SCCKL 4A L VPS +5V 4 A DRI V 3 14A 4 DRI VL 5A +24V 5 S0 V 3 S0 V 2 4 RET 2 () () () 14B L DON 14B T ENH 14B 2 R2 0 3 S C D T B L M1 1 A
  • Brother International IntelliFax-3550 | Service Manual - Page 176
    1 2 3 4 5 6 A +5V RA4 1 . 0 Kx 4 RA6 2 . 2 Kx 4 RA8 2 . 2 Kx 4 A +5V 1 2 3 4 3 2 1 4 1 4 3 2 P1 5 5 7 L E4 0 3 6 0 10 11 12 13 32 31 36 14 1 9 B 8 7 6 5 4 3 2 16 17 19 20 21 22 23 C 24 25 26 27 28 29 30 S0 V 18 +5V 7 6 5 8 5 8 7 6 5 6 7 8 R7 1 5 0 8 1 6 3
  • Brother International IntelliFax-3550 | Service Manual - Page 177
    1 2 3 4 5 6 NCU1 +5V +24V 10 12 Q1 8 M5 V +24V M5 V C ML L 3 DT C1 1 4 YK 16 4 16 8 A 2 C ML H 11B #13 C1 2 9 #8 C9 8 #14 C1 3 3 A R8 7 1 K PL S 3 11B 1 7 4 HC4 0 5 3 CC1 0 4 KI 3 2 4 CC5 0 C1 0 4 7 4 HC4 0 5 3 CC1 0 4 678 11 678 R8 0 22K +5V R8 1 1K 2 4
  • Brother International IntelliFax-3550 | Service Manual - Page 178
    1 2 3 4 SYMBOL MF C 4 5 5 0 P L U S MF C 4 5 5 0 P L U S D S MF C 7 6 5 0 1 Pa g e R3 4 R1 9 7 NOT MOUNTED NOT MOUNTED NOT MOUNTED R5 R1 0 8 NOT MOUNTED NOT MOUNTED NOT MOUNTED 2 Pa g e #15 4 MD R A MX 1 6 1 6 MD R A MX 1 6 #10 A #9 NOT MOUNTED 42-PIN IC SOCKET NOT MOUNTED 42-
  • Brother International IntelliFax-3550 | Service Manual - Page 179
    MA I N P5 CONNECTOR 1 2 8 A- 0 2 6 S2 B +5V P3 CONNECTOR B5 B- PH L ASER 3 +5V GND 2 GND SCDT 4B 1 VDO REI KI 3A 4 L DON BD 6A RESI 2A 5 R1 1 / 4 W 3 0 0 +5V PC1 A C PHOTOSENSOR ON1 0 2 4 K E BD Q3 SWITCHING TRANSISTOR DT C1 1 4 YS A G N D T CS 3B COV E R 13A
  • Brother International IntelliFax-3550 | Service Manual - Page 180
    1 2 A 3 4 5 RA3 5 1 X2 J W1 6 4 B 3 4 - 4 P MJ C 2 3 4 1 FPC CABLE 8P P3 P2 1 1 22 88 FG FG 2 +26V CR1 MZ F - 2 4 H G or OUA Z - S S - 1 2 4 D + PL S 4 1 3 3 3 2 S0 V V1 7 7 4 4 5 5 6 6 2 1 R2 4 JW 3 4 S0 V T E L OF F +5V C E B S0 V SREF S0 V 3 4
  • Brother International IntelliFax-3550 | Service Manual - Page 181
    + - + - + - + - 1 S L I NE A E J P2 5 ( 10) J P2 6 ( 5) B 2 3 J P2 9 ( C) J P8 ( 5) J P1 1 ( 10) A - OUT 4 RDPS CH2 J P2 3 ( 5) 4 7 5 3 6 J P2 0 ( 5) 1 2 T E L OF F 1 J P1 9 ( 2 0 ) + - M E C B J P2 2 ( 1 0 ) M C B J P2 8 ( C) J P2 1 JP ( 20) 30 M C ( C) B M C B
  • Brother International IntelliFax-3550 | Service Manual - Page 182
    + - + - + - + - 1 S A L I NE E J P2 5 ( 10) J P2 6 ( 5) B 2 3 CH2 J P2 3 ( 5) J P8 ( 5) J P1 1 ( 10) 4 7 5 3 6 J P2 0 ( 5) 1 2 A - OUT + - T E L OF F 1 M E C BJ P2 2 ( 1 0 ) M C B J P2 8 ( C) J P2 1 J P1 9 ( 2 0 ) JP ( 20) 30 M ( C) C B M C B + - PL S + 1 4
  • Brother International IntelliFax-3550 | Service Manual - Page 183
    + - + - + - + - 1 S A L I NE E J P2 5 ( 10) J P2 6 ( 5) B CH2 2 J P8 ( 5) J P1 1 ( 10) 4 7 5 3 6 J P2 0 ( 5 ) 1 2 J P2 3 ( 5) J P2 9 ( C) A - OUT 3 4 . 3 V X2 + - T E L OF F 1 M E C SP7 BJ P2 2 ( 1 0 ) M C B J P2 8 ( C) J P1 9 ( 2 0 ) J P2 1 JP ( 20) 30 M C ( C) B
  • Brother International IntelliFax-3550 | Service Manual - Page 184
    + - + - + - + - 1 S A L I NE E J P2 5 ( 10) J P2 6 ( 5) B 2 3 CH2 J P2 3 ( 5) J P8 ( 5) J P1 1 ( 10) 4 7 5 3 6 J P2 0 ( 5) 1 2 A - OUT + - T E L OF F 1 M E C BJ P2 2 ( 1 0 ) M C B J P2 8 ( C) J P2 1 J P1 9 ( 2 0 ) JP ( 20) 30 M C ( C) B M C B + - PL S + 1 4
  • Brother International IntelliFax-3550 | Service Manual - Page 185
    D CONTROL PANEL 1/2
  • Brother International IntelliFax-3550 | Service Manual - Page 186
    1 2 3 MF C 2 P A N E L K E Y MA T R I X R E F E R E N C E T A B L E KEY NO PPF3 5 5 0 MF C K E Y CODE 1 A 2 Se t 36 Se t 0E 3 Func t i on Func t i on 3E 4 Cl e a r Cl e a r 06 5 16 6 Tel - i ndex Tel - i ndex 1E 7 Re s o l u t i o n Re s o l u t i o n 2E 8 Mo d e
  • Brother International IntelliFax-3550 | Service Manual - Page 187
    E POWER SUPPLY (120 V) Low-voltage power supply
  • Brother International IntelliFax-3550 | Service Manual - Page 188
    E POWER SUPPLY (200-240 V) Low-voltage power supply (European versions)
  • Brother International IntelliFax-3550 | Service Manual - Page 189
    E POWER SUPPLY (200-240 V) Low-voltage power supply (Asian versions)
  • Brother International IntelliFax-3550 | Service Manual - Page 190
    E POWER SUPPLY High-voltage power supply
  • Brother International IntelliFax-3550 | Service Manual - Page 191
    Sept. '98 5X52012 Printed in Japan
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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL:
FAX3550/3650/8000P/8200P
MFC4450/4550/4550plus
MFC6550MC/7550MC/7650MC
MFC9000/9500