Daewoo DHC-XD 350, Service Manual

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17
5. Trouble Shooting Guide
DHC-XD350
OPTICAL OUT
Abnormal
Check if the IC407
PIN 3 waveform is OK.
Check if the IC405
PIN 11 is OK
Check if the IC304
PIN 12 is OK.
Refer to DIR circuit AK4112.
Replace Optical IC.
Refer to 74HCU04 circuit
IC405.
Refer to MPEG circuit.
Yes
Yes
Yes
No
No
No
MAIN VOLUME &
CHANNEL Level
Abnormal
Check if the
IC201, IC202 STA304A is
OK.
Refer to FRONT PCB. Refer to DDX STA304A.
N
o
Yes
Optical in OK
Refer to Dir circuit IC304
AK4112.
Optional in
Abnormal(with DSP
option)
Check if the
IC408 PIN 1 is OK.
Check if the IC408
PIN 3 is OK.
Refer to POWER SUPPLY
circuit.
Yes
Yes
N
o
N
o
Check if the IC405
PIN 2 waveform is OK.
Check if the IC304
PIN 20 waveform is OK.
Replace OPTICAL IC.
Refer to 74HCU04 circuit
IC405.
Yes
Yes
N
o
N
o
Check if the IC407
PIN 1 waveform is OK.
Refer to Power supply
circuit.
No
Yes
REMOTE CONTROL
Abnormal
Check if the IC703 PIN
31 is OK.
Refer to MICOM circuit IC703. Refer to RMC IC IC702.
No
Yes
-. Audio Part