7. TROUBLESHOOTING
FLOW CHART NO.2 POWER
(2)
FLOW CHART NO.1 POWER TROUBLESHOOTING (1)
No power.
Is the fuse good?
NO
Replace fuse.
YES
NO
Are
voltage line normal?
YES
Check primary circuit, D921, D925,
and D927.
Are
AT 25V and
NO
Check each rectifier circuits and
filament voltage lines normal?
short-circuit of secondary circuit.
YES
I
Check peripheral circuit of
and
signal line etc.
Check system control circuit
and cam switch circuit.
In case of Fuse
blown out.
I
check
result of check, if
Check short-circuit or leak of D921
FLOW CHART NO.3 POWER TROUBLESHOOTING (3)
In case of abnormal noise (sound).
I
FLOW CHART NO.4 POWER TROUBLESHOOTING
In case of output voltage
low level.
I
Check the
and Q922.
Replace D930,
and
Check
NO
Replace
NO
or
Replace
YES
Check
C913 thru to
and D925.
Summary of Contents for VC-MH80
Page 64: ...10 VC MH80 10 VC M H90 8 L I 7 I 8 I 9 I 1 0 I 11 I 1 2 1 68 ...
Page 68: ...180 VC MH80 190 C MH90 c3 Playback Signal m Recording Signal b E E Signal 72 ...
Page 69: ...POWER CIRCUIT BLOCK DIAGRAM yi 2 __ i 1 I 1 VC MH80 VC M H90 73 V Vt _ _ ____ _ _ _ ____ i ...
Page 72: ...VC MH80 VC MH90 I 7 I 8 I 9 I 1 0 I 11 I 1 2 I 76 ...
Page 73: ...I I I I I I 1 I I ...
Page 74: ...VC MH80 VC MH90 78 ...
Page 76: ...VC MH80 VC MH90 1 f I I I I 7 I 8 I 9 I 1 0 I 11 I 1 2 I 80 ...
Page 77: ...RB n f I JI 3 I i I I ...
Page 78: ...VC MH80 VC MH90 I II I I II __ _ i r I 7 I 8 I 9 I 10 I 11 I 1 2 1 5 82 ...
Page 79: ...I I 0 I n I m I 0 I 0 I m I b 1 L I III r ...
Page 80: ...10 IO VC M H80 VC MH90 r 8 a a4 ...
Page 81: ...VC MH80 vc I VC MH90 vc I MAIN CIRCUIT 5 1 2 I 3 I 4 I 5 I 6 I a5 ...
Page 84: ...VC M H80 VC MH90 1362 1 u 404 I I RN I 404 7h RN1404 I 7 I a I 9 I 1 0 I 1 1 I 1 2 I ...
Page 85: ......
Page 86: ...VC MH80 VC MH90 I 7 I a I 9 I 1 0 I 11 I 1 2 I 90 _ _ ...
Page 87: ...VC MH80 VC MH90 OPERATION TIMER CIRCUIT VC MH90 1 I 2 I 3 I 4 I 5 I 6 I ...
Page 88: ...0 VC M H80 0 VC M H90 I I I I 7 I a I 9 I 1 0 I 11 I 1 2 I ...
Page 92: ...VC M H80 VC M H90 LL I I 7 I 8 I 9 I 10 I 11 I 12 I ...
Page 94: ...r L i ...
Page 97: ...VC MH80 vc n VC MHSO vc n PWB FOIL PATTERN I M A I N P W B 2 I 3 I 4 I 5 I 6 I 101 ...
Page 98: ...VC MH80 VC MHSO 102 ...
Page 99: ...VC MH80 VC MH90 IF PWB OPERATION P REC TIP PWE U U TIF I 2 I 3 I 4 I 5 I 6 I 103 ...
Page 123: ...VC MH80 VC MH90 11 EXPLODED VIEWS MECHANISM CHASSIS PARTS I 1 I 2 I 3 I 4 I 5 I 6 1 127 ...
Page 124: ...VC MH80 VC MH90 CASSElTE HOUSING CONTROL PARTS 1 I 2 1 3 I 4 I 5 1 6 I 128 ...
Page 125: ...VC MH80 VC MH90 MECHANICAL PARTS I 1 I 2 I 3 I 4 I 5 I 6 1 ...