Table of Contents
Advertisement
(2) LCD light abnormal
ANY KEY POWER ON
(without DISC)
Do display LCD then light?
NO
Check voltage in the power
supply circuitry.
YES
Is u-com IC201 reset circuit
normal? Pin86
YES
Is u-com IC201 Xin,Xout terminal
Pin 1,100 input?
OSC : 4.5MHz
YES
Is u-com IC201 keyin Pin7 Pin45
0volt input?
YES
Is u-com IC201 Pin46, 47, 48
output waveform normal?
5V
YES
Is IC701 com1, com2, com3
output waveform normal?
5V
Display LCD connector defective.
- 2-2 -
NO
NO
4.8V
0V
NO
NO
NO
NO
Power supply circuitry defective.
Q501, Q502, Q506, IC201
Reset circuit defective.
IC201, Q505, Q506.
CT201, CC201, CC202 defective.
CN201,front PCB pattern
defective.
IC201 pin46~48,front PCB
pattern defective.
IC701 Surrounding circuit PCB
pattern defective.
Advertisement
Table of Contents
