DAEWOO ELECTRONICS DV 115, Service Manual

Page: 15 / 63

15
5. Trouble Shooting Guide
DV-115/125
OPTICAL OUT
Abnormal
Check if the IC503
PIN(5) waveform is OK.
Check if the IC502
PIN(3) is OK
Check if the IC502
PIN(2) is OK.
OPTICAL OUT OK.
Refer to DIR circuit IC504
AK4112.
Refer to 74HCU04 circuit
IC503.
Refer to POWER SUPPLY
circuit.
Yes
Yes
Yes
No
No
No
REMOTE CONTROL
Abnormal
Check if the IC904
PIN8 is OK.
Refer to MICOM circuit IC904. Refer to RMC IC IC905.
No
Yes
Trim VOLUME
Abnormal.
Check if the
CS4228 is OK.
Check FRONT PCB. Refer to CODEC IC CS4228.
No
Yes
MAIN VOLUME
Abnormal
Check if the
M62446FP is OK.
Refer to FRONT PCB.
Refer to VOLUME IC
M62446FP.
No
Yes
Optical in OK
Refer to Dir circuit IC504
AK4112.
Optional in Abnormal
Check if the
IC501 PIN(1) is OK.
Check if the IC501
PIN(3) is OK.
Refer to POWER SUPPLY
circuit.
Yes
Yes
No
No
Check if the IC504
PIN(11) waveform is OK.
Check if the IC508
PIN(28) waveform is OK.
Replace OPTICAL IC.
Refer to 74HCU04 circuit
IC503.
Yes
Yes
No
No
COAXIAL-IN Abnormal
Check if the JA501
PIN(1) is OK.
Check if the IC504
PIN(13) is OK.
Check if the IC508
PIN(28) waveform is OK.
COAXIAL IN OK
Replace RCA JACK.
Refer to 74HCU04 circuit
IC503.
refer to DIR circuit AK4112.
Yes
Yes
Yes
No
No
No
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