USB (Front) Device Flow
USB device is not recog
nized
Insert the USB device again.
Is it recognized when the poweris
turned OFF and then ON again?
No
Is 5V present at CN201(FR-318)
board) pin1?
No Is 5V present at
CN1002
(MB board) Pin 12 or pin 13?
No
Is 5V present at IC 6 01 pin1
(MB board)?
No
Power supply IC310 (MB board -
defective
Ye s Y se Y seY se
Poor contact of the USB device
Defective FFC between the IF
board and the MB board.
Does replac
ing I
C601(MB board)
improve the symptoms?
No Replace the MB board
Yes
Replace the FFC between th
e
MB board and the IF board.
Do the symptoms improve?
No Replace the MB board 106CI.(MB board) defective
Yes
Defective FFC between the IF
board and the MB board
9-11E
BDP-BX39/
S390
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