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
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