Daewoo DV-135, Service Manual

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5. Trouble Shooting Guide
DV-135
12
1. Basic Operating
Is STANDBY LED on?
Push power on.
Is POWER on?
Does initial read work
Turn Power on.
Does it play?
Does it output audio?
OK
Yes
Yes
Yes
Yes
Yes
Yes
Check AUDIO circuit.
No
Check tracking SERVO
circuit.
No
Check LASER circuit.
Check focus circuit.
Check disc.
Check protect circuit.
No
Check power supply circuit.
No
Check POWER SUPPLY
circuit.
Check connection CN906.
No
2. Front Micom Circuit
Replace IC904
Yes
Check if IC904 Pin38
is HIGH ?
Check IC904 reset waveform
Check if IC904 Pin44
is High(+5.0V) ?
Check +5.0V line.
Check if IC904 Pin4
is Low(0 V) ?
Check Power down line.
Check if IC904 Pin18
is High ?
Yes
Check Protection circuit.
No
No
No
No
No
No
No
1
Does DVD appear
at VFD ?
Push power on.
Does loading appear
at VFD ?
Yes
Does no DISC or
time appear at VFD ?
Yes
Check if DVD an Audio Micom
Interface is OK.
Yes
Does Video1/2,
MD/TAPE, TV, FM 87.5kHz
appear at VFD ?
Yes
OK
Check from Micom
to DVD Interface
Check Power
Check Loader.
Check MPEG PCB
Yes
Check Power Supply circuit
No
No
No
Does it not appear
DVD Display at VFD ?
Yes
Does it apear PCM
96kHz Stereo at VFD ?
Yes
Check connector
CN901 if is normally
Yes
Check power supply
circuit of Main PCB
Yes
Refer to Power Supply Circuit.
Check Oscillator of X901
Yes
Replace X901
Check if IC401 Pin65
is work ?
Yes
Check DVD Reset control
Check if Connector
CN901 Pin4 is work ?
Yes
Check Connector
(CP901,CP903) if is
normally.
Yes
Reconnect it.
No
Reconnect it.
No
No
No
No
No
No
No
No
1
No
-. Audio Part