TX-SR308/ /508/ 578/ 608 HT-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2
TROUBLE SHOOT-1
No Power
TX-SR308/ /508/ 578/ 608 HT
-R280/ 380/ 538/ 580/ 680/ 980/ C230/ C260 DTR-20.2/ 30.2
No Power
YES
NO
YES
YES
NO
NO
YES
BAETC-0376/0390 (Power supply)
BADG-0364 (MPU Board)
JL901 4pin +12V
2pin +10V
BAETC-0376/0390 (Power supply)
Replace Power Supply Board orRepair
Sub Transformer T902 and itsperipheral
circuit.
BAETC-0376/0390
(Power supply)
BADG-0364 (MPU Board)
After Power on,
Voltage atJL901_1pin is changed
from +12V t o 0V?
BADG-0364 (MPU Board)
Replace Q701 and also
repairits peripheral circuit.
BAETC-0376/0390
(Power Supply)
F901 is blown out?
BAAF-0355(AF Board)
BADG-0346 (MPU Board)
After Power on, Voltage at
P2001 22/21pin +5V
17/18pin +12V
BAETC-0359/0352/0345/
(trans teminal Board)
BAVD-0375/0389
(Video board)
This is just for general reference and does not including every single case.
Replacing F901 will not
improve the unit.
After replacing F901 on
BAETC-0376/0390
(Power supply)
either of F901 on
Power supply
Board
or F6901/F6902 on BAAF-0341(AF
Board) blows out?
Replace “AF Board”.
or “D6901 (Power supply diode)”
“Power AMP(Final_TR and A_Class AMP)
”
and also repair their peripheral circuit.
After Power on, Voltage at
JL952 AC10V
Replace Power
Transformer or
Repair its peripheral circuit.
Replace Video Board or
Repair D901/Q9023/Q9031
and their peripheral circuit.
YES
YES
NO
NO
NO
