LG MDV902 Service Manual page 58

D
FOCUS ON OK?
YES
TRACKING OK?
YES
DISC PLAY?
YES
E
PROPER
NO
SIGNAL ON A, B, C,
D FROM MD?
PROPER
FOO SIGNAL ON
IC401?
CHECK CABLE CONNECTION
BETWEEN PDM01 AND MD.
PROPER
NO
TRO SIGNAL ON
IC401?
T+ & T- OUTPUT
PROPERLY?
CHECK CABLE CONNECTION
ON PICK-UP HEAD.
NO
CHECK RF SIGNAL
WAVEFORM.
4-5
NO
YES
NO
YES
NO
YES
NO
YES
CHECK THE CONNECTIONS
BETWEEN PDM01 AND
PICK-UP HEAD.
CHECK THE RELATED
CIRCUIT OF ES8381
FOCUS SIGNAL.
CHECK THE RELATED
CIRCUIT BETWEEN IC401
AND ES8381
CHECK THE TRACKING
CONTROL ON MOTOR
DRIVER (IC401).