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ELECTRICAL TROUBLESHOOTING GUIDE -2/10
QQ
3 7 63 1515 0
2. µ-COM Circuit
A. No Power
YES
Does Logo appear
on the screen?
YES
TE
L 13942296513
OK
1
Is oscillation of
X501 normal?
YES
Are IC503 Pins 14,
and 29 normal?
YES
A
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.
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Does no DISC appear?
NO
NO
NO
Check the oscillation
NO
288
Check short.
OK
Replace IC501
or IC503.
x
ao
y
i
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8
POWER ON
Does Hellow
appear at FLD?
NO
connected normally?
Reconnect it.
Q Q
3
6 7
1 3
Refer to Front Part
Check short
Replace IC506.
u163
.
-74-
2 9
9 4
2 8
NO
Is P5901
YES
Check power.
(Refer to power)
1 5
0 5
8
2 9
9 4
NO
Is P5901 Pin 23 normal?
A
The
NO
NO
waveform on A[00:21]
and D[00:15] of IC501
normal?
NO
Are IC506 Pins 7, 8 normal?
Replace Main B/D.
m
co
9 9
If power is
normal
2 8
9 9
YES
1
YES
YES
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