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Brother DX-2000 Service Manual

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LASER PRINTER

SERVICE MANUAL
DX-2000
MECHANICS & ELECTRONICS

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Summary of Contents for Brother DX-2000

  • Page 1: Laser Printer

    LASER PRINTER SERVICE MANUAL DX-2000 MECHANICS & ELECTRONICS...

  • Page 2: Table Of Contents

    CONTENTS CHAPTER I GENERAL..............I-1 1. SPECIFICATIONS ...................I-1 CHAPTER II MECHANICAL SYSTEM..........II-1 1. BLOCK DIAGRAM ..................II-1 2. PAPER FEED MECHANISM ................II-1 3. PAPER FEED SEQUENCE ................II-2 4. PAPER PRESSER MECHANISM..............II-3 CHAPTER III ELECTRICAL SYSTEM........... III-1 1. COMPOSITION .....................III-1 2. MAIN PCB FUNCTION ..................III-1 I/F Circuit ........................III-1 Regulator ........................III-1 Fan Drive Circuit ......................III-1...
  • Page 3 Paper Presser Motor....................IV-13 T Belt B40S2M396...................... IV-14 Photo Interrupter 1240....................IV-14 3. INSIDE FRAME UNIT ................. IV-15 Reversible Frame ....................... IV-15 Photo interrupter 1240 ....................IV-15 Solenoid ........................IV-16 Carriage Guide 2 Assy....................IV-16 Carriage Guide 1 ......................IV-17 Duplex PCB Assy .......................

  • Page 4: Chapter I General

    CHAPTER I GENERAL SPECIFICATIONS Paper type Cut sheet Feedable paper weight : 60 ~ 105 g/ m Paper size Max. : 216.0 x 356.0 mm Min. : 182.0 x 257.0 mm A4, Letter, Legal, Executive, ISO B5 (not available for the optional lower paper cassette) Input power supply 24V DC ±...
  • Page 5 4) Transportation conditions Environment : Temperature -20°C ~ 60°C Humidity 95%RH or below 5) Vibration Vibration Vibration Measuring method acceleration frequency 0.2 G 5 ~ 100 Hz Refer to the evaluation test standard. During operation At standby 0.2 G 5 ~ 100 Hz Same as above.

  • Page 6: Chapter Ii Mechanical System

    CHAPTER II MECHANICAL SYSTEM BLOCK DIAGRAM The Duplex unit is composed of an outside frame, an inside frame and a Duplex tray, and operates according to signals sent from the printer in serial communication. Outside frame Inside frame Printer Fan motor Open cover sensor Main PCB Reversible motor...

  • Page 7: Paper Feed Sequence

    PAPER FEED SEQUENCE As soon as the printer requests for Duplex drive, the solenoid is turned on, the flapper is switched, and the motor runs forward. The reverse sensor is monitored to measure the time from when the solenoid is turned on to when the sensor is turned on.

  • Page 8: Paper Presser Mechanism

    As soon as the printer requests for stop, the motor stops and goes into a standby state. • • Paper Feed Timing Chart (when only one piece of A4 paper is reversed and printing speed is 12 ppm) 4.84 sec* Solenoid 0.1 sec Reversible...

  • Page 9: Chapter Iii Electrical System

    CHAPTER III ELECTRICAL SYSTEM COMPOSITION Main PCB M50927 I/F PCB +24V Motor drive circuit Regurator I/F circuit Fan drive circuit Printer Figure 3.1 MAIN PCB FUNCTION I/F Circuit This interface circuit is used to transmit and receive data with the printer. Since the Duplex unit responds only to commands from the printer, the Duplex unit transmits its status upon request from the printer.

  • Page 10: I/F Pcb

    I/F PCB The I/F PCB consists of two connectors (8-pin modular jack connectors) for connection of the printer to other optional devices, a paper pressure motor, a cassette sensor, an open cover sensor connector, and a connector for connection of the harness from the main PCB.
  • Page 11 • Without a STATUS request COMMAND transmission/receipt sequence /ATTN 200 µs 500 min SICLK 4 µs 400 min 350 max 6.4 min 6.4 min SIDATA D0 D1 D2 D3 D4 D5 D6 D7 500 max 50 µs 12.8 µs 350 max 150 min •...

  • Page 12: Chapter Iv Disassembly

    CHAPTER IV DISASSEMBLY EXTERNAL COVERS Composition Lock lever cover Lock lever cover Side cover L Side cover R Top cover Bottom cover Figure 4.1 Side Cover R Push the lock lever cover, turn and open the inside frame unit. Lock lever cover Outside frame unit Inside frame unit Figure 4.2...
  • Page 13 Loosen the screw fastening the side cover R. Side cover R Taptite, bind B M3 x 6 Figure 4.3 Using a small minus screwdriver, disengage the six hooks to remove the side cover R from the outside frame R and the bottom cover. Separate the side cover R from the Duplex unit.

  • Page 14: Side Cover L

    Side Cover L Unfasten the screw fastening the side cover L. Taptite, bind B M3 x 6 Side cover L Figure 4.5 Using a small minus screwdriver, disengage the five hooks to remove the side cover L from the outside frame L and the bottom cover. Separate the side cover L from the Duplex unit.

  • Page 15: Bottom Cover

    PR99079 Bottom Cover Turn and close the inside frame unit. Lay down the Duplex unit on the side to face up the bottom cover. Loosen the two screws. Bottom cover Taptites, cup S M3 x 6 Figure 4.7 Disengage the engaging locks of the bottom cover from the outside frame L, and separate the cover from the Duplex unit.

  • Page 16: Top Cover

    Top Cover Place the Duplex unit with the bottom down. Pushing the lock lever cover, turn and open the inside frame slightly. (approx. 30°) Lock lever cover Approx. 30° Lock lever cover Inside frame unit Outside frame unit Figure 4.9 Disengage the hook of the lock lever cover by using a minus screwdriver, and pull out the cover slantingly.
  • Page 17 Loosen the four screws (two on each side). Top cover Taptites, Taptites, cup S M3 x 6 cup S M3 x 6 Top cover Figure 4.11 Slide up the top cover to disengage the five engaging locks from the inside frame unit, and separate the top cover from the Duplex unit.

  • Page 18: Outside Frame Unit

    OUTSIDE FRAME UNIT Composition Tower bars Outside frame R assy Outside frame L assy Carriage guide 3 Paper pressure motor Figure 4.13 2.2.1 Removing the outside frame unit from the Duplex unit Turn and close the inside frame unit. Disconnect the relay harness assy from the Duplex I/F PCB assy and the edge saddle.
  • Page 19 Edge saddle Relay harness assy Duplex I/F PCB assy Figure 4.15 Slide the R side of inside frame unit toward you to remove it from the fulcrum shaft L and the outside frame unit. Inside frame unit R side Outside frame unit Fulcrum shaft L Figure 4.16 IV-8...

  • Page 20: Mounting The Outside Frame Unit In The Duplex Unit

    2.2.2 Mounting the outside frame unit in the Duplex unit Keeping the inside frame unit slantwise, mate the hole for the fulcrum shaft L of the inside frame unit with the fulcrum shaft L. Note1 : Do not get the relay harness assy caught between the inside frame unit and the outside frame unit.

  • Page 21: Duplex I/F Pcb

    Pass the fulcrum shaft R through the outside frame unit, the fulcrum spring and the inside frame unit. Using nippers, set the other end of the fulcrum spring (inside frame unit side) in the inside frame unit. Inside frame unit Retaining ring E4 Outside frame unit Retaining ring E6...

  • Page 22: Outside Frame R Assy, L Assy

    2.4 Outside Frame R Assy, L Assy Unfasten the four screws. Remove the two tower bars from the outside frame unit. Tower bars Taptite, cup S M3 x 5 Outside frame unit Taptites, cup S M3 x 5 Taptite, cup S M3 x 5 Figure 4.21 Unfasten the two screws.

  • Page 23: Paper Pressing Gear 1, 2

    Unfasten the four screws. Remove the outside frame L assy and the paper pressure frame assy from the carriage guide 3. Taptites, cup S M3 x 5 Outside frame L assy Carriage guide 3 Paper pressure frame assy Taptites, cup S M3 x 5 Figure 4.23 Paper Pressing Gear 1, 2 Remove the gear release spring from the paper pressure frame assy and the gear...

  • Page 24: Paper Presser Motor

    Remove the two retaining rings E3. Pull out the two paper pressing gear shafts. Remove the paper pressing gears 1 and 2. Paper pressing gear 2 Paper pressing gear 1 Retaining rings E3 Gear release lever Paper pressing gear shafts Figure 4.25 Paper Pressure Motor Unfasten the screw A.

  • Page 25: T Belt B40S2M396

    T Belt B40S2M396 Remove the belt tension spring. Unfasten the screw. Remove the T belt B40S2M396. Outside frame L assy Belt tension spring Taptite, cup S M3 x 5 T Belt B40S2M396 Figure 4.27 Photo Interrupter 1240 Flexing the hook inward, turn the photo interrupter 1240 in the direction of the arrow and remove it.

  • Page 26: Inside Frame Unit

    INSIDE FRAME UNIT Reversible Frame Unfasten the six screws. Remove the reversible frame. Screws, pan (S/P washer) M3 x 8 Inside frame unit Switching guide Reversible frame Taptites, cup S M3 x 6 Figure 4.29 Photo interrupter 1240 Disconnect the reverse sensor harness assy from the photo interrupter 1240. Flex the hooks of the photo interrupter 1240 to the inside to remove it.

  • Page 27: Solenoid

    Solenoid Remove the solenoid spring. Unfasten the two screws. Remove the solenoid. Detach the retaining ring E3. Remove the switch arm and the solenoid link. Note1 : Since the solenoid assy harness is connected to the conductor, handle it with care. Note2 : Mount the solenoid without leaving the harness exposed excessively.

  • Page 28: Carriage Guide 1

    Carriage Guide 1 Slid the carriage guide 1 slightly in the direction of the arrow. Disengage the carriage guide 1 from the engaging locks of the inside frame assy. Slide up and remove the carriage guide 1. Engaging lock Engaging lock Inside frame unit Carriage guide 1 Figure 4.33...

  • Page 29: Dc Fan Motor

    Unfasten the four screws. Remove the Duplex PCB assy. Taptites, cup S M3 x 5 Duplex PCB assy Taptites, cup S M3 x 5 Figure 4.35 DC Fan Motor Use a minus screwdriver to disengage the hook of the reversible gear 15-30, and detach the gear.

  • Page 30: Reversible Motor Assy

    Unfasten the three screws. Remove the DC fan motor. Note1 : The DC fan motor should be so mounted that the label will not be exposed. Screw, pan (washer) M3 x 29.5 Screws, pan (washer) M3 x 29.5 DC fan motor Figure 4.37 Reversible Motor Assy Unfasten the two screws.

  • Page 31: Du Tray Carrying Way Unit

    DU TRAY CARRYING WAY UNIT Unfasten the screw on the back of unit. Taptite, bind B M3 x 6 DU tray carrying way Roller Figure 4.39 Turn the unit to the face and remove the pressure roller. DU tray carrying way Pressure roller Figure 4.40 IV-20...
  • Page 32 Unfasten the three screws. Taptite, bind B M3 x 6 Carriage guide 4 Figure 4.41 Remove the four hooks on the back of unit and carriage guide 4. Hook Hook Hook Hook DU tray carrying way Figure 4.42 Carriage guide 4 Figure 4.43 IV-21...
  • Page 33 Note1 : Take care not to come off the rear ground spring. When reassembling the rear ground spring, put it in the locating boss. Rear ground spring Locating boss Front ground spring Figure 4.44 Remove the tray pulley gear shaft from the clamp. Paper pressure plate T Belt B40S2M396 DU tray carrying way...
  • Page 34 Remove the paper pressure fulcrum shaft from the two clamps. Paper pressure 1 Paper pressure 2 assy Paper pressure fulcrum shaft DU tray carrying way Clamps Figure 4.46 Remove the roller assy from the clamp. Clamp Roller assy Figure 4.47 IV-23...
  • Page 35 Remove the discharge brush. Front ground spring Discharge brush Clamps Figure 4.48 IV-24...

  • Page 36: Chapter V Troubleshooting

    Troubleshooting (1) Problem Cause Check Result Remedy The Duplex mode cannot Misoperation Is the modular cable connected properly? Turn off the power to the printer, and connect be set on the panel. the modular cable properly. Then, turn on the power again.
  • Page 37 Troubleshooting (2) Problem Cause Check Result Remedy Paper is not supplied in Misoperation Is the Duplex unit set properly in the Set the Duplex unit properly according to the the Duplex unit. printer? manual. Main PCB Does the voltage vary from 24V to 0V at Replace the main PCB.

  • Page 38: Connection Diagram

    Appendix 1. Connection Diagram...

  • Page 39: Motor Drive Circuit

    Appendix 2. Motor Drive Circuit...
  • Page 40 Appendix 3. Main PCB Circuitry Diagram CODE UK3283000 B48K264CIR NAME...
  • Page 41 July, ’98 54T047NE0-DX-2000...
  • Page 42 DUPLEX UNIT PARTS REFERENCE LIST MODEL:DX-2000...
  • Page 43 NOTE FOR USING THIS PARTS REFERENCE LIST 1. In the case of ordering parts, it needs mentioning the following items: (1) Code (2) Q'ty (3) Description (4) Symbol ( PCB No., Revision , and Parts location mounted on the PCB.) Note : No orders without Parts Code or Tool No.

  • Page 44: Main Pcb Circuit

    CONTENTS INSIDE FRAME UNIT ................1 OUTSIDE FRAME UNIT ............... 1 MAIN PCB..................... 3 COVERS ....................3 TRAY CARRYING UNIT ............... 5 PAPER TRAY ..................5 DOCUMENTS & ATTACHMENTS ............7 PACKING MATERIALS................. 7...

  • Page 45: Inside Frame Unit

    1. INSIDE FRAME UNIT MODEL DX-2000 54T-X10-510 2. OUTSIDE FRAME UNIT MODEL DX-2000 54T-X10-550...
  • Page 46 REVERSING MOTOR 55 ASSY 2 UF4444001 SCREW, PAN(P WASHER) M4X6 UH1707001 SOLENOID ASSY U50553001 SCREW, CUP M3X5 UJ4232000 PHOTO INTERRUPTER:1240 UH1732001 REVERSE SENSOR HARNESS ASSY MODEL DX-2000 54T-X10-510 2. OUTSIDE FRAME UNIT REF.NO. CODE Q'TY DESCRIPTION REMARK UH1655001 T BELT, B40S2M396 Z25996001 MOTOR, BP484223LM31-FD...

  • Page 47: Main Pcb

    3 . MAIN PCB MODEL DX-2000 54T-X10-100 T/I No. PR99027 4 . COVERS MODEL DX-2000 54T-X10-400...
  • Page 48 Q'TY DESCRIPTION SYMBOL REMARK UK4106001 MAIN PCB ASSY, DX-2000 B48K264-2A CHG REV. 087320516 TAPTITE, CUP S M3X5 UK4108001 DUPLEX IF PCB ASSY, DX-2000 B48K265-1 087320516 TAPTITE, CUP S M3X5 MODEL DX-2000 54T-X10-100 4. COVERS REF.NO. CODE Q'TY DESCRIPTION REMARK UH1667001...

  • Page 49: Tray Carrying Unit

    5 . TRAY CARRYING UNIT MODEL DX-2000 54T-X10-610 6 . PAPER TRAY MODEL DX-2000 54T-X10-650...
  • Page 50 5. TRAY CARRYING UNIT REF.NO. CODE Q'TY DESCRIPTION REMARK UH2035001 DU TRAY CARRYING WAY UNIT 2 MODEL DX-2000 54T-X10-610 6. PAPER TRAY REF.NO. CODE Q'TY DESCRIPTION REMARK 1 - 7 UH3162001 PAPER TRAY S UNIT DX3 (SP) UH2487001 SEPARATION PAD ASSY T...

  • Page 51: Documents & Attachments

    7 . DOCUMENTS & ATTACHMENTS MODEL DX-2000 54T-X10-910 8 . PACKING MATERIALS MODEL DX-2000 54T-X10-930...
  • Page 52 7. DOCUMENTS & ATTACHMENTS REF.NO. CODE Q'TY DESCRIPTION REMARK UH3728001 USER'S GUIDE, DX-2000 UH1735001 MODULAR CORD 8PDX UH2440001 PAPER FEED ROLLER ASSY DU2 UH2439001 INSERTION SHEET MODEL DX-2000 54T-X10-910 8. PACKING MATERIALS REF.NO. CODE Q'TY DESCRIPTION REMARK UE0694001 CARTON, DX-2000...
  • Page 53 July, ’98 54T048NE0-DX-2000...

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