3-16
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
Check IC(U401)
Check connections between
MT1389 and pick-up head.
NO
Focus on OK.
Proper
signals on A, B, C, D
of MT1389
NO
YES
Check the related circuit
on MT1389 FEO sugnal.
NO
Proper FEO signal
on MT1389.
YES
YES
Check cable connection on
pick-up head.
Check the related circuit
on MT1389
NO
Track on OK.
Proper FEO signal
on MT1389.
NO
Disc is play?
NO
YES
Check the TRSO connection
on MT1389 and motor dirver.
NO
Properly TRSO signal
on MT1389.
YES
Check the tracking control
amp circuit on motor driver.
T+ & T-
output properly.
YES
Check RF signal waveform.
YES
YES
E
D
YES
YES
Summary of Contents for DP270B
Page 15: ...3 6 MEMO ...
Page 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...
Page 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...
Page 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...
