Table of Contents
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AUX in does not work
AUX in does not
work
Go
Check voltage at U27 PIN16:12V on Main
Board whether normal or not
Yes
Check Main Board U27 PIN1,PIN5 PIN12
PIN14 signal input whether right or not
Yes
Check voltage at U33 74HC4052
PIN16, +12V, on Main Board
Whether normal or not
Yes
Check
U33
Or not
broken
Yes
Replace U33 74HC4052
74HC4052
whether
No
5-8
Refer to Power Board CN502
No
No
Check AUX Input Board
Check Main Board U1 power
No
supply and out circuit
Check Main Board U4
Trouble shooting Chart
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