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Fault mode analysis: (Refer to the table of fault symptoms and countermeasures.)
1. The power cannot be switched on.
The power cannot be
switched on.
Replace the fuse.
Does the fuse
blow when the
power is
switched on?
Defective parts around IC1150, D1140
2. The power can be switched on, but there is no operation.
The power can be switched on, but there is
no operation.
Switch on the power.
Does the LED
of the CD
mouse light?
Do some of the panel
switches/LEDs
operate?
Defect related to the
SC/MD microcomputer
No
Yes
Defective power supply
No
circuit of the +5 V system
Yes
Defect related to the UI
No
microcomputer
Yes
** Observe the waveforms of microcomputer CS, address, and data, and determine the fault location.
When there is absolutely no operation, doubting the SC/MD microcomputer is fastest.
Blown fuse
The LCD backlight
lights, but the LED
does not light.
Defect related to the UI
microcomputer
Defect related to the
No
SC/MD microcomputer
Yes
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