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2. U-COM Circuit
A. No Power
q
POWER
ON
)
NO
Does Bar appear at FLD?
YES
NO
Is P5901
YES
Do all five Bars appear?
connected normally?
NO
Does Logo appear
NO
Check power.
on the screen?
(Refer to power)
YES
If power is
normal
NO
Is P5901 Pin 24 normal?
Refer to Front Part
YES
Is oscillation of
waveform on A[00:21]
and D[00:15] of IC50
Check short
NO
Are IC503 Pins 14, 28
and 29 normal?
Check short.
Are IC506 Pins 7, 8 normal?
YES
Replace IC501
or IC503.
Replace IC506.
Replace Main B/D.
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