3-33
ELECTRICAL TROUBLESHOOTING GUIDE
B
Check speaker cable connection.
Check IC202.
Check IC700, IC701,
IC702, IC703.
Check IC203, IC204.
Check SMPS.
Check Q705, Q706, Q707,
Q708, Q711, Q712, Q713, Q714.
Check IC202.
Check IC705.
Check IC205.
Check SMPS.
Check Q717, Q718.
pin47~50
of IC202, FL/FR± signal
OK?
pin13 of
IC700, IC701, IC702, IC703
FL/FR audio signal OK?
IC203, IC204
FL/FR audio signal OK?
±66 V, -12 V, ±5 V
Power voltage OK?
Q705, Q706,
Q707, Q708, Q711, Q712, Q713,
Q714 OK?
pin45, 46 of IC202,
SW1± signal OK?
pin13 of IC705
SW1 audio signal OK?
IC205
SW1 audio signal OK?
±66 V, -12 V, ±5 V
Power voltage OK?
Q717, Q718
OK?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK
Summary of Contents for CM9750
Page 15: ...2 2 ...
Page 19: ...4 SPEAKER SECTION A60L A60R ...
Page 75: ...3 71 3 72 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW ...
Page 77: ...3 75 3 76 2 MAIN P C BOARD TOP VIEW ...
Page 78: ...3 77 3 78 MAIN P C BOARD BOTTOM VIEW ...
Page 79: ...3 79 3 80 3 FRONT P C BOARD TOP VIEW ...
Page 80: ...3 81 3 82 FRONT P C BOARD BOTTOM VIEW ...
Page 81: ...3 83 3 84 4 FRONT_CTRL P C BOARD TOP VIEW BOTTOM VIEW ...