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(2) LCD light abnornal.
Any Key power on.
(without DISC)
Do display LCD then light?
NO
Check voltage in the power
supply circuitry.
YES
Is u-com IC401 reset circuit
normal? Pin11
YES
Is u-com IC401X1, X2 terminal
Pin15, 16 input?
OSC : 9.8304MHz
YES
Is u-com IC401 keyin Pin17, 46
72, 76 5volt input?
YES
Is u-com IC401 Pin 3,9,27,76
output waveform normal?
YES
Is IC901 Com1, Com2, Com3
output waveform normal?
YES
Display LCD connector defective.
- 2-2 -
Power supply circuitry
NO
defective.
Q380,Q381,IC403
Reset circuit defective.
NO
IC821 Surrounding circuit
defective.
NO
X401, C413,C414 defective.
Q260, CN401 front PCB
NO
pattern defective.
NO
IC401, Pin3, 9, 27, 76 front
PCB pattern defective.
NO
IC901, Surrounding circuit
PCB pattern defective.
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