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USB (Rear) 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 CN604 pin1(
MB-
140
board)?
No
Is 6V present at
IC603 pin8
(MB board)
No
Power supply board defective
Poor contact of the USB device
Does replacing IC601(MB board)
improve the symptoms?
No
Replace the MB board
Yes
IC603(MB board) defective
9-15
Yes
Yes
Replace the MB board
Yes
BDP-S485