105
M722 N/B MAINTENANCE
M722 N/B MAINTENANCE
6.8 USB PORT TEST ERROR
An error occurs when a USB I/O device is installed.
USB TEST ERROR
1. Check if the USB device is
installed properly.
2. Confirm USB driver is installed
ok.
Test
OK?
Re-test
OK?
Change M/B or go
into board-level
Troubleshooting.
YES
NO
Correct
It.
YES
NO
Change the
faulty part
then end.
Board-level
Troubleshooting for
USB test error
Check the following parts for cold solder or one of the following
parts on the mother-board may be defective, use an oscilloscope
to check the following signal or replace the parts one at a time and
test after each replacement.
Parts:
ON M.B
U510, U519, R555
R556, R567, R568
R601, R595, RP514
RP515, X505, R701
C701, C702, CP502
CP501, RP516, RP517
F504, L513, R608
R621, C568, C585
L511, L510, L508
C581, C575, L509
F1, L2, R2, R1, C4
C502, C1, L3, L4
Signals:
ON M.B ON D/D B.D
USBP1-
USBPD0-
USBP1+
USBP0-
USB_OC#0
USBP0+
ON TRANS BD
USBPD2-
CUSBPD1-
USBPD3-
USBHUB_OC#[1~3]
Try another known
good USB device.
Parts:
ON M.B
L1, C3, C2, J501
R557, R558, C539
C540, R159, R158
ON D/D B.D
F501, R503, R502
C4, C8, L3, C3, L6
L7, L8, C2, C5, J3
J501
ON TRANSITION BD
L44, L45, L528, L46
J516, J518
