Onkyo TX-SR308 Service Manual page 3

A B
TROUBLE SHOOT- 2
No Display
No Display
1
NO
Fluorescent Display Tube
is not working?
YES
Replace Fluorescent
Display Tube or
BADIS-0373/0387(Display
2
Board).
BAPS-0342/0349/0356
(-VP Board)
Replace -VP Board or
Check for signal line
damage etc. and fix any
damages.
3
4
Timing of Serial Communication
1 byte data
address data
5
C
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.
The results depend on the oscilloscope.
BAPS-0342/0349/0356(-VP Board)
JL953 between 2pin-4pin: AC3.3V
YES
NO
BAPS-0342/0349/0356
(-VP Board)
JL951 1pin-2pin AC3.3V
NO
YES
BAPS-0342/0349/0356
NO
(-VP Board)
Replace Power transformeror
R950(8.2 ) is disconnected?
Repair its peripheral circuit.
YES
BAPS-0342/0349/0356 (-VP Board)
Replace R950 (8.2 ) or -VP Board
1 byte data
data to be
TX-SR308/ /508/ 578/ 608 HT-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2
D E
BADIS-0373/ 0387
BAPS-0342/0349/0356 (-VP Board)
(Display Board)
JL953 3pin -33V
YES
P701
1pin and 5pin +3.3V
26pin FLD_SDD
NO 27pin FLD_CLK
28pin FLD_CS
BAPS-0342/0349/0356(-VP Board)
Transmission of each
of the signals is correct?
JL951 3pin-4pin AC40V
NO
BADG-0413(MPU Board)
YES
Replace
or Repair Q701 and
their peripheral circuit.
BAPS-0342/0349/0356 (-VP Board)
Replace -VP Board or Repair
Q960/D960/D962/R961 and
their peripheral circuit.
FLD_CLK FLD_SDD(DATA) FLD_CS
V:1V/cm
H:02Msec/cm
V:1V/cm
H:10µsec/cm
V:1V/cm
H:1µsec/cm
F G
BADIS-0373/ 0387
(Display Board)
YES Replace Display Board
or repair Q7003 and
their peripheral circuit.
NO
MPU Board.
H