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Brother MFC370MC Service Manual

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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: FAX-270MC/290MC/520DT/520MC
MFC370MC/390MC

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  Summary of Contents for Brother MFC370MC

  • Page 1 FACSIMILE EQUIPMENT SERVICE MANUAL MODEL: FAX-270MC/290MC/520DT/520MC MFC370MC/390MC...
  • Page 2 NOTE This Service Manual presents specifications, theory of operation, and maintenance information which pertain exclusively to the FAX-270MC/290MC/520DT/520MC/ MFC370MC/390MC. For additional descriptions common to both FAX-270MC/ 290MC/520DT/520MC/MFC370MC/390MC and FAX170/190/510/HOME FAX, please refer to the FAX170/190/510/HOME FAX Service Manual.
  • Page 3 CHAPTER GENERAL DESCRIPTION...
  • Page 4: Specifications

    SPECIFICATIONS Model FAX-270MC/290MC MFC370MC MFC390MC Color Black (1395) White (1138) White (1138) Modem Speed 14400 bps CodingMethod 9 sec. TransmissionSpeed CCITT Group Max. 216/216 mm Input/OutputWidth Hold Key AutomaticCutter ADF Capacity 10 pages Anti-curlSystem Roll P aper S ize(Standard thermalf_erma PLUS) 98' (1"...
  • Page 5 Model FAX-520DT/520MC Color Black(1395)/White (1397)* Modem Speed 14400 bps Coding Method Transmission Speed 9 sec. CCITT Group Input/Output Width Max. 216/216 Hold Key Automatic Cutter ADF Capacity 10 pages Anti-curl System Roll P aper Size(Standard t hermalfTnerma PLUS) 30 m (1' Core) LCD Size 16xl On-screenProgramming...
  • Page 6 CHAPTER Ill. THEORY OF OPERATION...
  • Page 7 ;;:: ..• " Main PCB Circuit Diagram 1/5 SW1, hook switch sensor (microswitch) SW2, cover switch sensor (microswitch) SW3, paper empty sensor (microswitch) Reset IC which turns on at the powering-on sequence and at any of the reset opera- tions.
  • Page 8 ® _" _4LCal '""° ,::: _':: °_o Main PCB Circuit Diagram 2/5 E2pROM (16k x I bit) ROM (256k x 8 bits. Note that the qualification machines for demonstration have a 2- megabit ROM.) DRAM (512k x 8 bits) Backup circuit for the calendar clock of the control panel and DRAM. Ill - 20...
  • Page 9 .... 1, I Main PCB Circuit Diagram 315 ® Connector for the CIS Power for the ClS LED array (_)-1: ®-2: Clock output O'3: Trigger signal output. One shot of this signal triggers a line of scan. ®-4: LED control signal output circuit which controls the intensity of the CIS LED ar- ray.
  • Page 10 Transistor array which consists of seven transistors (_)-1: Transistors that control the rotation direction of the motor _._.u_uing to me MM4 through MM1 signals. (_)-2: Transistor that turns on and off the solenoid. The combination of the solenoid state and the motor rotation direction deter- mines to which the motor torque should be transmitted, the cutter, the document feeding mechanism, or the paper feeding mechanism.
  • Page 11 "'3,. powe R .,,_:: ....,,_"(_._;, ..' ®- i::ii!, i! : .::., Jh_,, J*. = o-, I _°_ _., °_ ,,,.llet • Main PCB Circuit Diagram 415 Connector for the power supply PCB O-1: CR1, recording head on/off relay 3-terminal regulator which eliminates unstabilized...
  • Page 12 Speaker i:tlwlpli|iel L;ircult which _lHpIitles _,ounds Issue(] lrom c_bovu ,_l_dlOg slgi_dl selector (_)-3 and feeds them to the speaker. Connector for the speaker Speaker volume control circuit (_)-1:VOL1 _)-2: VOL2. _)-3:VOL3 Medium Speaker volume High (ON: Closed OFF: Opened) III - 23 - 1...
  • Page 13 ____ Main PCB Circuit Diagram 515 Microphone connector Amplifier and shaper circuit for signals inputted from the microphone. Analog front end IC which processes the analog I/O signals from/to the MODEM. Amplifier circuit for signals outputted from the MODEM. III - 23 - 2...
  • Page 14 NCU PCB The NCU PCB switches the communications line to telephone or Ioullt-_n ML)DI-M, u_+derthe control of the main PCB. TILIL _LRL T_OFF +..+ _.I," l¢lll .++O--I.I.L-_c_ I,+O.--_--M_ 7, MC: METALLIZIID POLYESTER FILM CAPACITOR e, PC: POLYESTER FILM CAPACITOR S. CC: CERAMICCAPACITO_ A.
  • Page 15 CHAPTER I¥. DISASSEM BLY/REASSEMBLY LUBRICATION...
  • Page 16 HUM L;over una _atle_y ASSY Insert the tip of the spring shown huuK a[ tile ueill.e[ ur lell. hal! ol tr_e luL;Klng below, then lift up the hook to release and move the ROM cover to the right. Slightly lift up the ROM cover and disconnect the battery harness from the main PCB, then take out the ROM cover together with the battery ASSY.
  • Page 17 Io taKe out the main PUb or the power supply PCB in Section 1.18, unhook the battery harness core and cutter HP sensor harness core from bosses "C" and "D," respectively, at this stage. Boss"C" Cutter HP sensor (Unhook the Dowersupply harness Power supplyharness h#rness core from here.)
  • Page 18 Control Panel ASSY Disconnect the main-panel harness and the main-mike harness from the main PCB, and then take out those harnesses from the groove of the main frame. Slightly bring the control panel ASSY back up towards you so that you can release the panel lock arm from the boss of the main frame.
  • Page 19 Push the control panel ASSY back and remove it. Control panel ASSY Panel lockarm Main-mike harness Main-panel harness • Reassembling Notes • Make sure that the main-panel harness and main-mike harness are routed through the groove provided on the recording paper cover and are kept in place with the panel lock arm, as illustrated on page IV-11.
  • Page 20 Recording Paper Cover, Panel Rear Cover, Control Panul and Microphone Place the control panel ASSY upside down. Turn the panel lock arm until the cutout provided in it becomes aligned with the bo_ OT the arm support, then pull it out to the left. Remove the two screws "a"...
  • Page 21 Take out thu mlcrot_tlone ,_a its harness trom the control panel. Bosses : Control panel Main-mike harness Latches To take out the LCD, remove the control panel PCB and the FPC key in step (6). As shown below, insert the tip of a flat screwdriver under clamp "D" in the direction of arrow R and push up clamp "D"...
  • Page 22 When setting the recording paper cover on the control panel, first insert the right and left front corners under sections "X" of the control panel and put the cover into place. Make sure that the main-panel harness and main-mike harness are routed as shown below. Control panel "X"...
  • Page 23 Scanner FrameASSY Be sure to swing the recordiny head release lever (blue lever) down to the front pos=- tion. Remove the two screws. Slightly lift up the rear edge of the scanner frame ASSY and disconnect the following five harnesses from the main PCB: •...
  • Page 24 Litt up the ACS gluulldlny _prlny. • Reassembling Notes Before putting the scanner frame ASS¥ 0ack, onto the main frame, be sure to set the ,_L;S grounding spring as illustrated on the previous page. Make sure that tabs "A" of the scanner frame ASSY are fitted in cutouts "B" provided in the main frame.
  • Page 25 1.1_ Main PCB, NCU PCB and Power Supply If you have already removed the scanner frame ASSY and speaker, slightly lift up the main PCB together with the NCU PCB and then disconnect the power supply harness from the main PCB. If the scanner frame ASSY and speaker, are not yet removed, follow the steps below: Slightly lift up the rear edge of the NCU PCB and disconnect it from the main PCB.
  • Page 26 Attempt, to Iitt up ttlu luain PCB slightly. It it is impossible to lift up the PCB to an extent which allows you to disconnect the harnesses, you may not have unhooked the power supply harness core or cutter HP sensor harness core from bosses "C" or "D," respec- tively.
  • Page 27 • Reassembling Notes Make sure that the power supply PCB is completely fitted in the resin PCB supports of the main frame. If it is loosely mounted so that it comes into contact with the bottom plate, a short circuit may occur. After putting the scanner frame ASSY back onto the main frame, route the harnesses and arrange the cores as follows, referring to the illustration given on the previous page.
  • Page 28: Maintenance

    CHAPTER MAINTENANCE MODE...
  • Page 29 WSW26 (Function setting 4) Selector Function Setting and Specifications 1" Application of DC wetting pulse Overvoltage limiter at the apply- ing time of a wetting pulse Not used. No. of CNG cycles to be detected No detection (when the line is connected via the external telephone except in the external TAD mode) No.
  • Page 30 FAX-270MC/290MC A4 8.5' FAX-290MC Record Emso • Play co:ce:<22e S.Volume _l H Function Tel-index Hetp/Q.Scan Hold co C* @° @* Redial/Pau*e co @, @o@o CO CO C@ Ce CO SpeedDial _'QRS WXYZ c, Q, @o@® Stop Copy Starl Speaker Phone co C_ @°...
  • Page 31 I-AX-b2UIVIL,; FAX-520MC Record Erase • Play co-co-co Recatl c., Co @,,@o CO CO C@ CO CO Redial/Pause c. Q, @,,Co PQRS WXYZ Stop Copy $1art co @oCo @o Speaker Phone Tone MFC370MC/390MC _:-_ _o.c Record Erase • Play CO=CO=C2@ LI_ S.Volurne _ H Function Tel.index Help/Q.Scan...
  • Page 32 3.10 Document Draw Adjustment After reptacement of the main PCB or CIS, or it data _to,ud in the EzPHOM is damaged, you ,,uud to carry out this procedure. • Function This function adjusts how much the document is drawn in, starting at the point when the document rear sensor is turned on until the leading edge of the document reaches the scan- ning start position.
  • Page 33 FAX-270MCI290MCI520DTI520MC MFC370MC/390MC APPENDICES L;irL;ult Diagrams Main PCB B. Network Control Unit (NCU) PCB C. Control Panel PCB...
  • Page 35 1. *: REFER TO MAIN 6/6. T7D60 FI]CCON £VOO EXTL REXT RAS0 CRXD B_MW_ SARMRD RMWE ROMC 'CLK SDOUT T7D60 SOI_ TSTA O +5 TSTB I ORQ I ORO CK_2ON MREO MREQ Oo(PWM) ADPDMD R143 ADMD CK_2 CKIe AA,_ CK16 Not mounted.
  • Page 37 1. *: REFER TO MAIN 6/6. _PD27C2001A flMf4D ROMC _I6B -PGM RI09 --_CTF ÷5 At I AI 0 .. TI.o.. ;: 222 : , ',2: : 1: 24LC32 02" a_US • lss37e _ 2_1 [ ..9104 BARMWE _16A BARMRD _I6B B2e- _16A...
  • Page 39 1. *: REFER TO MAIN 6/6. a7aPH Not mounted. RI_0 ",2_ IJ2W +,,,, c_oa ÷ c_0_ R,31 ,°T_z, ..• AI16 R_29 ,o-- ..I..R__ AVDD s*_P REAR ROAT AGNO ._121 i .."R134 O'O---- ' :'C21 " ZjID S 3_eTD _ T_IO po_JPP4...
  • Page 41 1. *: REFER TO MAIN 616. B5BPH POWER BA10324F _ < , < .° I2 T_OUT A_V.DT ± TC35133F 74HC4053 ..BA10324F I .."P2 9110S12L MAIN 416...
  • Page 43 1. *: REFER TO MAIN 6/6. c_sE_ 1o o_ ..1 gt, "" "" CLS_L CTSL__ TELSt CtSL_ ct Rs-r CLC_ e0 _ CLTXS CLCK ClSSY CLRXS i ..RXI_^ VSI_S "_?_ TELSL °'___ VSS, vsst MUTE 14AP _STL USSL MAIN 5/6...
  • Page 45 v_L - - - - ..± FAX-270MC/290MC, FAX-520DT' FAX-520DT MFC370MC/390MC 520MC S . ASSY S.ASSY S.ASSY PAGE 180-X88 87180-X88 87180-X88 MMZR60IA MMZR601A MMZR6OIA MMZR601A MMZR601A MMZR6OIA L7,L10 MMZR601A MMZR6OIA MMZR6OIA MMZR601A MMZR601A MMZR6OIA lOko lOkQ CC104 CC104 - C27 CCI04 CC104 CCI04...
  • Page 47 ÷2P CC222 EC2.2P EC I 0P RA35TX2 )1÷ NCUS CC221 F----4 h-----_F---- _Oso RI2100K SBT0260X2 lOOn FL5R200PNX2 >2W S_YB4 PCI53 400V [_> SIZ860 lOOK _RI6 At 5 -04 "---_00221 JW16 _iTLP627 TELSL 100K PS2533 ..ZD2. 6-2PMJ <3 TELRL MC474 1/2W <3 250V...
  • Page 49 Ik-2 CC104 b2089-1220 BU12102 D" G.o,11 .... D _2 El-' L_CD0 L_OI L_D2 _C04 LCD5 _"# L_DI] LCO7 SKHVBDx4 -----I--O S W2 DOUT S58PH D ° .sVOic, K O5 D° K O6 00104 P O1 oc,o,T T T.._ LED2 SLR- 342VR LED1 BR2272S...
  • Page 51 PANEL MATRI REFERENCE TABLE NAME (CL) MODE RESOLUTION .qr_-- PANEL E RE HOOK ({_) IOKEY-1 IOKEY-2 IOKEY-3 HOLD (PAUSE) IOKEY-4 - 9P IOKEY-5 IOKEY-6 - 7P REDIAL/PAUSE (HOLD) IOKEY-7 IOKEY-8 IOKEY-9 SPEAO DIAL(HOOK) IOKEY-* 10KEY-O IOKEY-# - 8P FUNCTION TEL-INDEX HELP 1TOUCH-1 1TOUCH-2...
  • Page 54 Dec_mb_T 5XLS15 Printed in Japaz_...

This manual is also suitable for:

Fax-270mcFax-290mcMfc390mcFax-520dtFax-520mc