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2. µ-COM Circuit
A. No Power
YES
Does Logo appear
on the screen?
YES
OK
1
Is oscillation of
X101 normal?
YES
Are IC107 Pin
14
,
28
and
29
normal?
YES
A
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Power RED LED on?
Does Bar appear at FLD?
Do all five Bars appear?
NO
NO
NO
Check the oscillation
NO
Check short.
OK
Replace IC107
or IC108.
POWER ON
NO
YES
NO
Is CON107
NO
connected normally?
Reconnect it.
Refer to Front Part
Check short
Replace IC101.
3-3
Refer to Front Part.
YES
Check power.
(Refer to power)
If power is
normal
NO
Is CON107 Pin6 normal?
YES
A
The
NO
NO
waveform on A[00:21]
and D[00:15] of IC108
normal?
YES
NO
Are IC101 Pin
7
,
8
normal?
YES
Replace Main B/D.
1
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