Sanyo HV-DX4EV Service Manual page 10

TROUBLESHOOTING
b. AV1 E-E
No sound in AV1 E-E mode.
YES
Is 12V obtained at IC251 pin#34?
NO
YES
Is 5V obtained at IC251 pin#40?
NO
Is Audio signal at IC251 pin#6, 7?
YES
NO
Is Audio signal output at IC251
Are CLK and DATA obtained at
pin#16,17?
IC251 pin#42,43?
YES
NO
Is Audio signal output at IC601 pin
Comparing with switching table, are SWA, B CTL SIGNAL
#3, 13?
YES
YES
Replace IC601.
Check Output JACK.
Check POWER circuit.
Check Input AV1 JACK
YES
Replace IC251.
right at IC601 pin #9,10?
NO
Check IC501.
16
c. AV2 E-E
No sound in AV2 E-E mode.
YES
Is 12V obtained at IC251 pin#34?
NO
YES
Is 5V obtained at IC251 pin#40?
NO
Is Audio signal at IC251 pin#8, 9?
YES
NO
Is Audio signal output at IC251
Are CLK and DATA obtained at
pin#19, 20?
IC251 pin#42,43?
YES
NO
Is Audio signal output at IC601 pin
Comparing with switching table, are SWA, B CTL SIGNAL
#3, 13?
YES
YES
Replace IC601.
Check Output JACK.
TROUBLESHOOTING
Check POWER circuit.
Check Input AV2 JACK
YES
Replace IC251.
right at IC601 pin #9,10?
NO
Check IC501.
17