MiTAC 7521 N - Usb Port Test Error

109
7521
7521
N/B MAINTENANCE
N/B MAINTENANCE
7.9 USB PORT TEST ERROR
An error occurs when a USB I/O device is installed.
U22
SIS
630
+5V
F502
L2
R26
R27
C21
C11
USB_OC0#
USB_B1
USB_A1
C19
C28
L13
USB_OC1#
+5V
F503
R22
R23
CP7
RP25
USBP0+
USBP0-
USBP1+
USBP1-
D/USBP0+
D/USBP0-
D/USBP1+
D/USBP1-
USB_B3
USB_B2
USB_A3
USB_A2
L100
L101
R160
R157
R147
R143
B1
A1
B3
B2
A3
A2
B4
A4
GND1
GND2
GND3
GND4
L507
L512
GND
USB_GND
J508