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