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( 5) of IC U6501?
Is USB +5V from U6501 pin (1) to the pin 1 of
CN6501?
Refer to “No sound output in all modes”.
NO
NO
Check the power supply.
Check the peripheral circuit of IC U6501
YES
YES
Is the USB USB2_DP (CN6501) signal properly
sent to pin (A17) (D3_P) and pin (B17) USB2_DN
of IC U502?
NO
Check the circuit between CN6501 and U502.
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