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POWER TROUBLESHOOTING
The VCR Is dead.
Unplug the AC power cord. Replug
it a few minutes later.
NO
Is the fuse alright ?
Replace the fuse.
YES
TIMER (1) TROUBLESHOOTING
FLOW CHART NO. 1
FLOW CHART NO. 2
The
display tube fails to light up.
Is AT 5V applied atpin @ of
1€5001 ?
Yes
Is AT - 30V applied at pin
of
1€5001 ?
YES
's there oscillation at pins
(0) and
® of 15001?
©
Check the AT 5V line.
Check the Power unit AT -30V line.
NO
Check for short in the main
PWB , fuse resistance and
Are the ATI2V, AT-30V, AT6.5V
and AT45V lines normal ?
YES
Check FL5001 and 1C5001.
.transistor trouble in the power
unit, etc.
ly
NO
Does pin
of 1C5001 change
NO
from "L "to" H" level when the
power is turned on ?
Is the display tube illuminated ?
See FLOW CHART2.
Check 1€5004 and 05034.
YES
YES
Are the ATSV and GND lines
NO
'
properly connected with IC801 ?
Check for poor soldering.
ie ral ag applied at pin © of
Check Q805 and Q806.
YES
YES
Is there oscillation at pins
and
{NO
6 of ICBO! ?
pins
@
and @) / Gof the display tube ?
Check the power unit.
YES
YES
fon an A Maca eeitphe ve
NO
Check pin 63) of IC801 or pin ®
the power is turned on?
of ICS001.
Dose the display tube function ?
Check for cracks on the tube.
YES
YES
Check P-CON SW
Q6606 in the
main PWB for malfunction, Check
Replace ICS001.
also the 9.4V regulator in the
Is PC9.4V supplied from the power
unit ?
z °o
power unit.
<
.
©
Oo
m
4
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