HBD-TZ145 (serv.man2) - Sony Audio Service Manual (repair manual). Page 2

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HBD-TZ145
2
TROUBLESHOOTING
1. Operation check fl ow
The power is 
turned on.
Check that the following fuse is not damaged.
F900 on the POWER board
Check that the output voltage of the pin 1 of 
CN901 on the POWER board is +25 V.
NG
OK
OK
OK
– Continued on next page –
Exchange the F900.
Part No.
9-885-166-83
Exchange the POWER board.
NG
NG
Check that voltage is normally inputted into the 
pin 7 (VIN) of IC503 on the MAIN board.
NG
Description
FUSE (T 3.15 AL/250 V)
Exchange the IC503.
Part No.
6-715-696-01
OK
Check that voltage is normally outputted from the 
pin 2 (OUT) of IC501 on the MAIN board.
NG
Exchange the IC501.
Part No.
9-885-166-91
Description
IC   TPS5430DDAR
Description
IC   AP2125N-3.3TRG1
OK
Check that voltage (+3.3 V) is outputted from the 
pin 2 (OUT) of IC502 on the MAIN board.
NG
Exchange the IC502.
Part No.
9-885-166-90
OK
Check that voltage (+3.3 V) is outputted from the 
pin 2 (OUT) of IC504 on the MAIN board.
NG
Exchange the IC504.
Part No.
9-885-166-90
Description
IC   AZ1117D-3.3
Description
IC   AZ1117D-3.3
OK
Check that there is no heat damage in the 
appearance of IC101/IC102/IC103 on the 
MAIN board.
OK
Exchange the MAIN board.
NG
Exchange the IC101/IC102/IC103.
Part No.
9-885-166-88
Description
IC   STA518
– MAIN board confirmation –

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