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2. u-COM Circuit
A. NO Power
AC In
Is LED On?
YES
Power On
Is LED Off ?
YES
Does bar appear
on FLD ?
YES
Does logo appear
on the screen?
YES
OK
NO
Is CN61 conneted
correctly?
NO
Reconnect CN61
NO
Check L620, R620
NO
Is oscillation of
X501 normal?
YES
Are IC503 Pin 14, 28
and 29 normal?
YES
The waveform on
A[00:21] and D[00:15] of
IC501 normal?
YES
Are IC506 Pin 7, 8
normal?
YES
Replace Main B/D
YES
Is 5.2V applied
to CN61 Pin 12 ?
Check FRONT Circuit
Check Power Circuit
NO
Check the oscillation
NO
NO
NO
Replace IC501 or IC503
2-3
NO
YES
Check short
YES
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