Troubleshooting - Sharp DV-500D Technical Manual

DV-560H

11. TROUBLESHOOTING

FLOW CHART NO.1 POWER TROUBLESHOOTING(1)
No power.
Unplug the AC power cord.
Replug it a few minutes later.
Is the fuse good?
Is AT 5V voltage line normal?
Are AT 8V,AT 12V,AT -30V and filament voltage
lines normal?
FLOW CHART NO.2 POWER TROUBLESHOOTING(2)
Replace F9001,Q9007,Q9010 and D9020, check
D9016 as a result of check, if poor, replace at the
same time.
FLOW CHART NO.3 POWER TROUBLESHOOTING(3)
In case of abnormal noise(sound).
Check D9024,D9005,D9006,D9007 and D9008.
FLOW CHART NO.4 POWER TROUBLESHOOTING(4)
In case of output voltage at low level.
Check the D9014,Q9006 and Q9009.
Check D9020.
Check D8022 and R8030.
Check short-circuit or leak of T901.
Check primary circuit,Q9007,Q9010,C9023,C9024,
C9027,D9011 and D9014.
FLOW CHART NO.5 DISPLAY TROUBLESHOOTING
The fluorescent display tube fails light up.
Is the supply voltage of 5V fed to pin(18) of
IC5001?
Is the supply negative voltage of -30V fed to pin
(16) of IC5001?
Is there about 4MHz oscillation at pins(19) and
(20) of IC5001?
Is filament voltage applied between (1)/(2) and
(61)/(62) of the fliorescent display tube?
Also negative voltage applied between these pins
and ground.
Dose the flourescent display tube function?
Replace IC5001.
Yes
Yes
In case of Fuse(F9001) blown out.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
See FLOW CHART NO.2 POWER TROUBLE-
SHOOTING(2)
No
Replace fuse.
No
Check primary circuit,D9007,L9001,C9019,C9014
and C9013.
No Check each recifier circuits and short-circuit of
secondary circuit.
Check short-circuit or leak of D9005 thru to D9008
and secondary circuit.
No
Replace D9014,Q9006 and Q9009.
No
Replace D9020.
No
Replace T9001.
No
Check AT 5V line.
No Check negative voltage line (AT -30V) and power
circuit.
No
Check FL5001 and IC5001.
No Check power circuit and peripheral circuit of
D5001.
No
Check for cracks on the flourescent display tube.
11-1
No