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?
No
Is 5V present at CN201(
FR-313
board
) pin1?
No
Is 5V present at
IC601
(MB board) Pin 5 ?
No
Is 6V present at
C601pin8
(MB board)?
No
Power supply IC310 (MB board -
defective
Yes
Yes
Yes
Yes
Poor contact of the USB device
Defective FFC between the FR
board and the MB board.
Does replacing IC601(MB board)
improve the symptoms?
No
Replace the MB board
Yes
Replace the FFC between the
MB board and the FR
board.
Do the symptoms improve?
No
Replace the MB board.
IC602(MB board) defective
Yes
Defective FFC between the IF
board and the MB board
9-16E
BDP-S485