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ELECTRICAL TROUBLESHOOTING GUIDE -6/10
QQ
3 7 63 1515 0
4. Front Circuit (Digitron & key)
START
Power on.
LED ON?
YES
Is Digitron on normally?
YES
Do all the
buttons work
normally?
YES
TE
L 13942296513
Check and replace
R903,R912, R904, R905,
R941, R906, R907.
Does remote control
work normally?
YES
Complete repairing Front B/D.
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.
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NO
Is oscillation of
X901 normal?
NO
Check waveform
of IC901 Pin 7.
CD
NO
Is waveform of IC901
Pin 21 normal?
NO
Check waveform of
IC901 Pin 14.
YES
Solder defective parts again.
NO
Does pulse
waveform of RC901 Pin 1
appear?
YES
Is IC901
Pin 17 connected to
RC901 Pin 1 ?
YES
Replace IC901.
YES
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y
i
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8
NO
YES
NO
YES
NO
YES
Q Q
3
6 7
1 3
NO
Is RC901 Pin 2 5V?
YES
Replace RC901.
YES
Re-solder.
YES
u163
.
-69-
2 9
9 4
2 8
Check Power.
Replace IC902.
NO
Check waveform
of IC901 Pin 14.
YES
Solder Key part.
Replace IC901.
1 5
0 5
8
2 9
9 4
NO
Check waveform
of IC901 Pin 18, 19.
YES
Replace IC901.
Replace LED913.
NO
Solder defective parts
m
co
9 9
2 8
9 9
Recheck
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