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Does not the sound of the audio signal from (USB input) go out?
YES
Is USB stick audio format correct?
YES
MAIN UNIT:
Is +5V input to pin( 2,3) of IC U6500?
YES
Is USB +5V from U6500 pin (6~8) to the pin 1 of
CN6500?
YES
Is the USB con (CN6500) signal properly sent to
YES
pin (U24) (USB_DP_P0) and pin (U25)
(USB_DM_P0 ) or pin (T24) (USB_DP_P1) and pin
(T25) (USB_DM_P1 )of IC U107?
YES
Refer to "No sound output in all modes".
No sound from external input devices (2)
NO
NO
NO
NO
27
Change to correct audio format.
Check the power supply.
Check the peripheral circuit of IC U6500.
Check the circuit between CN6500 and U107.
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