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ELECTRICAL TROUBLESHOOTING GUIDE
9. DOUBLE USB FUNCTION
USB FUNCTION
YES
Plug-in USB device.
YES
Display "NO USB".
YES
Display "READ".
YES
Display "NO FILE".
YES
Check USB audio file in USB device
(MP3, WMA file is playable)
NO
Check USB_5V.
Check USB_D+, D-
(R573, R574, C573, C574
D501, D502).
Check IC501
(pin U7, U8/ A7, A8).
3-32
NO
YES
NO
YES
NO
Check CN502.
Check USB jack
(CN801, CN802).
Replace IC501.
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