Service Manuals, User Guides, Schematic Diagrams or docs for : ONKYO Audio TX-SR578 onkyo_tx-sr578

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                                                                                            TX-SR578

                                                                                   Ref. No. 4193
                                                                                         032010
                                 SERVICE MANUAL


                                 AV RECIEVER
                  MODEL TX-SR578


                                                          (RT/PTY/TP)




(PURE AUDIO)




               NOTE:
               (PURE AUDIO)   European, Australian and
               (RT/PTY/TP)    Asian modes used




                                                                                  RC-764M
  Black, Silver and Golden models

       BMDD, BMDC                                        120V AC, 60Hz
       BMDF
       BMPP, SMPP                                        230V AC, 50Hz
     BMMO, SMMO
                220-240V AC, 50/60Hz
     BMMQ, BMPA


        SAFETY-RELATED COMPONENT
        WARNING!!
        COMPONENTS IDENTIFIED BY MARK                                    ON THE
        SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
        CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
        REPLACE THESE COMPONENTS WITH ONKYO
        PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
        IN THIS MANUAL.
        MAKE LEAKAGE-CURRENT OR RESISTANCE
        MEASUREMENTS TO DETERMINE THAT EXPOSED
        PARTS ARE ACCEPTABLY INSULATED FROM THE
        SUPPLY CIRCUIT BEFORE RETURNING THE
        APPLIANCE TO THE CUSTOMER.
                                                                                                                   TX-SR578

SERVICE PROCESURE


 1. Replacing the fuses

                            This symbol located near the fuse indicates that the
    fuse used is show operating type, For continued protection against
    fire hazard, replace with same type fuse, For fuse rating, refer to
    the marking adjacent to the symbol.

                            Ce symbole indique que le fusible utilise est e lent.
    Pour une protection permanente, n'utiliser que des fusibles de meme
    type. Ce demier est indique la qu le present symbol est apposre.

       REF. NO.      PART NAME      DESCRIPTION                       PART NO.      REMARKS
        F6901         FUSE            10A-UL/T-233                252330GR
        F6901or       FUSE            10A-T/UL-ST2                252333GR
        F6902         FUSE            10A-UL/T-233                252330GR
        F6902or       FUSE            10A-T/UL-ST2                252333GR
        F901          FUSE            4A-SE-EAK   FUSE            252077GR 
        F901          FUSE            8A-UL/T-233                 25232 9GR 
        F901or        FUSE            8A-T/UL-ST2                 252 261GR 
        F901or        FUSE            4A-SE-TL250V                252277GR < MMO, MMQ, MPA, MPP >

                                              : Canedian model                    :    Saudi Arabia model
                                              : North American model              :    European model
                                              : Australian model                  :    Hong Kong model
                                                                                       :    Taiwanese model



 2. Safety check out
  (U.S.A. model only)
  After correcting the original service problem, perform the following safety check before releasing the unit to the customer.
  Leakage current Check
  Measure the leakage current to a known earth ground (water pipe or conduct etc.) by connecting a leakage current
  tester between the earth ground and exposed metal parts of the unit (input/output ground terminals, screw heads or metal over
  Plug the power supply cord directly into a 120Vac 60Hz wall socket and turn ON/STANDBY button on.
  Any current measured must not exceed 0.5mA.



 3. To initialize se tting
  Initi ali za tion of memories.
 Press ON/STANDBY button while pressing down VCR/DVR button
 when the unit is POWER ON, the n the FLT displays "CLEAR", and
 turn to STAN D-BY. Remove pow er cord from pow er line.
                                                                    TX-SR308/ /508/ 578/ 608 HT-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2



TROUBLE SHOOT-1                       This is just for general reference and does not including every single case.
No Power


           No Power
                                                                           BAETC-0376/0390
                                                                                   (Power supply)
                                                                           BADG-0364 (MPU Board)                       BADG-0364 (MPU Board)
   BAETC-0376/0390 (Power supply)                          YES                                                NO




                                                                                                                                                       TX-SR308/ /508/ 578/ 608 HT-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2
                                                                           After Power on,                             Replace Q701 and also
   BADG-0364 (MPU Board)                                                   Voltage atJL901_1pin is changed             repairits peripheral circuit.
   JL901 4pin +12V                                                         from +12V t o 0V?
         2pin +10V

                         NO                                                                   YES

   BAETC-0376/0390 (Power supply)                                             BAETC-0376/0390
   Replace Power Supply Board orRepair                                                (Power Supply)
   Sub Transformer T902 and itsperipheral                                           F901 is blown out?
   circuit.
                                                  YES                                         NO

   After replacing F901 on                                                   BADG-0346 (MPU Board)
                                                           NO                After Power on, Voltage at      YES
   BAETC-0376/0390 (Power supply)
                                                                             P2001 22/21pin +5V
   either of F901 on Power supply Board         Replacing F901 will not
                                                                                   17/18pin +12V
                                                improve the unit.
   or F6901/F6902 on BAAF-0341(AF
   Board) blows out?
                                                                                               NO
                        YES
                                                                          BAETC-0359/0352/0345/                         BAVD-0375/0389
         BAAF-0355(AF Board)                                              (trans teminal Board)                          (Video board)
                                                                           After Power on, Voltage at
                                                                                                             YES
                                                                                                                     Replace Video Board or
   Replace "AF Board".                                                     JL952 AC10V                               Repair D901/Q9023/Q9031
   or "D6901 (Power supply diode)"                                                                                   and their peripheral circuit.
   "Power AMP(Final_TR and A_Class AMP) "
                                                                                              NO
   and also repair their peripheral circuit.
                                                                            Replace Power
                                                                            Transformer or
                                                                            Repair its peripheral circuit.
                                                                                                                                    TX-SR308/ /508/ 578/ 608 HT-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2
           A                                  B                               C                              D                                  E                                 F                           G         H
    TROUBLE SHOOT- 2                                    This is just for general reference and does not include every single case.
                                                        The above waveforms are got by Oscilloscope of Maximum Horizontal Sensitivity: 100MHz.
    No Display                                          The results depend on the oscilloscope.


1                    No Display



               Fluorescent Display Tube
                                              NO    BAPS-0342/0349/0356(-VP Board)                   BAPS-0342/0349/0356 (-VP Board)                 BADIS-0373/ 0387
               is not working?                      JL953 between 2pin-4pin: AC3.3V                      JL953 3pin -33V                             (Display Board)
                                                                                        YES                                                    YES   P701                                     BADIS-0373/ 0387
                                                                                                               1pin and 5pin +3.3V
                                                                                                                                                     26pin FLD_SDD                             (Display Board)
                     YES
                                                          NO                                                     NO                                  27pin FLD_CLK                    YES   Replace Display Board
                                                                                                                                                     28pin FLD_CS                           or repair Q7003 and
           Replace Fluorescent                          BAPS-0342/0349/0356
           Display Tube or                                                                            BAPS-0342/0349/0356(-VP Board)                 Transmission of each                   their peripheral circuit.
                                                                       (-VP Board)
           BADIS-0373/0387(Display                      JL951 1pin-2pin AC3.3V                           JL951 3pin-4pin AC40V                       of the signals is correct?
2          Board).                                                                            NO
                                                          YES                                                                                                  NO
                                                                                                                  NO
           BAPS-0342/0349/0356                          BAPS-0342/0349/0356
                                                   NO
                           (-VP Board)                                  (-VP Board)      Replace Power transformeror                                 BADG-0413(MPU Board)
           Replace -VP Board or                         R950(8.2 ) is disconnected?      Repair its peripheral circuit.
           Check for signal line                                                                                                 YES                 Replace MPU Board.
           damage etc. and fix any                                                                                                                   or Repair Q701 and
                                                          YES                                                                                        their peripheral circuit.
           damages.

                                                    BAPS-0342/0349/0356 (-VP Board)                     BAPS-0342/0349/0356 (-VP Board)
                                                    Replace R950 (8.2 ) or -VP Board                    Replace -VP Board or Repair
3
                                                                                                        Q960/D960/D962/R961 and
                                                                                                                   their peripheral circuit.




                                                                                                                            FLD_CLK                  FLD_SDD(DATA) FLD_CS


                                                                                                              V:1V/cm
                                                                                                              H:02Msec/cm
4
                  Timing of Serial Communication

                                                                                                              V:1V/cm
                                                                                                              H:10



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