80
Caution: When checking the primary circuit, be sure to use an isolation transformer.
TROUBLESHOOTING GUIDES
POWER CIRCUIT
Does the AC power cord
check OK?
Is 140V supplied to pin
!
,
@
of SM801 primary?
Is output voltage of SM801
secondary correct?
Is output voltage of Q801
emitter 9V?
Is voltage of cathode of
D806 32V?
OK
Change AC CORD
Change SM801
Check R804/D802/D807/C810
Check R806 and D806
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check F801/L801/
D801/C806
NO OUTPUT Voltage
Isoutput voltage of Q802
emitter 5V?
Check R805/R809/D805/C818
YES
NO
YES
Summary of Contents for DV-K784N-JJ
Page 35: ...34 AC001 K884NZ SJ M K884NZ SG M only...
Page 36: ...35...
Page 37: ...36...
Page 38: ...37...
Page 39: ...38...
Page 66: ...65 ELECTRICAL ADJUSTMENTS Fig 1 Circuit Board Location...
Page 99: ...98 INTERCONNECT WIRING DIAGRAM K884N K784N K804N Hi Fi INTERCONNEC WIRING DIAGRAM REV 1 97 2 5...
Page 100: ...99 POWER SUPPLY SCHEMATIC DIAGRAM FREE VOLTAGE K884NY SJ M K884NZ SJ M K884NZ SG M...
Page 102: ...101 PRE AMP SCHEMATIC DIAGRAM K884N K784N 804N Hi Fi PREAMP SCHEMATIC DIAGRAM REV 1 97 2 5...
Page 103: ...102 VIDEO AUDIO SCHEMATIC DIAGRAM K884N K784N K804N...
Page 104: ...103 PIF MPX SCHEMATIC DIAGRAM K884N K784N K804N Hi Fi PIF MPX SCHENATIC DIAGRAM REV 1 97 2 5...
Page 105: ...104 TIMER SYSCON SCHEMATIC DIAGRAM K884N K784N K804N...
Page 106: ...105 Hi Fi AUDIO SCHEMATIC DIAGRAM K884N K784N K804N Hi Fi AUDIO SCHEMATIC DIAGRAM REV 1 97 2 5...
Page 107: ...106 POWER SUPPLY BLOCK DIAGRAM FREE VOLTAGE K884NY SJ M K884NZ SJ M K884NZ SG M...
Page 108: ...107 POWER SUPPLY BLOCK DIAGRAM 120V ONLY K884N SJ K884N JJ K884N SG K784N SJ K784N JJ K784N SG...
Page 109: ...108 PRE AMP BLOCK DIAGRAM K884N K784N K804N Hi Fi PREAMP BLOCK DIAGRAM REV 1 97 2 5...
Page 110: ...109 VIDEO AUDIO BLOCK DIAGRAM K884N K784N K804N Hi Fi VIDEO BLOCK DIAGRAM REV 1 97 2 5...
Page 111: ...110 PIF MPX BLOCK DIAGRAM K884N K784N K804N Hi Fi PIF MPX BLOCK DIAGRAM REV 1 97 2 5...
Page 113: ...112 Hi Fi AUDIO BLOCK DIAGRAM K884N K784N K804N AUDIO BLOCK DIAGRA REV 1 97 2 5...