6-8
6-10. USB (Front) Device Flow
USB device is not recognized
Insert the USB device again.
Is it recognized when the power is
turned OFF and then ON again?
Is 5V present at CN201
(FR board) Pin1?
Defective FFC between the IF
board an the MB board.
Is 5V present at CN705
(MB board) Pin8 or Pin9?
Poor contact of the USB device.
If USB connector damage replace
FR board.
Replace the FFC between the MB
board and the IF board. Do the
symptoms improve?
Defective FFC between the IF
board and the MB board
Replace the MB board
Replace the MB board
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