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I CDC abnormal(For main board)
CDC does not work
Is 2,4pin of CDC normal?
YES
Is connection of 1pin of CDC with U201 normal?
YES
Normal
CDC audio abnormal
Is 1,7pin of U501 normal?
YES
Is 3,4,29,30pin of U503 normal?
YES
Normal
All manuals and user guides at all-guides.com
NO
Check Fb503
NO
Is pin8 of U501 Dc9? If not, check correlative printed wire
else, check peripheral components.
NO
If still abnormal, change U501
NO
Check U503 and peripheral components.
If still abnormal, change U503
Check correlative print wire
Is 31pin of U503 DC9V?
15
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