72
TROUBLESHOOTING
POWER CIRCUIT
Check IC601, IC701.
No power
POWER cord is ok?
Is 120~200V voltage
obtained at C801+?
Output voltage of 2
nd
parts is abnormal?
Check
rectifier diode of 2
nd
parts ;
D901,D903,D904,D905,D906,
D907,D908,D909,R921.
Switching
pulse of Q801 drain, Q701
drain is normal?
OK
Exchange POWER CORD
Check D801, TH801,
F801,LX801, LX802.
Exchange rectifier diode of
2
nd
parts ;
D901,D903,D904,D905,D906,
D907,D908,D909,R921.
Check IC801, Q801, IC701, Q701.
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
◆
Caution: When checking the primary circuit, be sure to use an isolation transformer.
All manuals and user guides at all-guides.com
Summary of Contents for DR-C912B
Page 13: ...11 INSTRUMENT DISASSEMBLY All manuals and user guides at all guides com...
Page 39: ...37 EXPLODED VIEW 6 3 EXPLODED VIEW OF FL ASS Y All manuals and user guides at all guides com...
Page 44: ...42 WAVEFORMS VIDEO WAVEFORMS 480 4 6 20 34 All manuals and user guides at all guides com...
Page 114: ...NORMAL AUDIO BLOCK DIAGRAM 112 BLOCK DIAGRAM All manuals and user guides at all guides com...
Page 117: ...AMP BLOCK DIAGRAM 115 BLOCK DIAGRAM All manuals and user guides at all guides com...
