mitac 8355.pdf - tim.id.au
mitac 8355.pdf - tim.id.au
mitac 8355.pdf - tim.id.au
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8.10 USB Test Error<br />
USB Test Error<br />
Check if the USB device is installed<br />
properly. (Including charge board.)<br />
No<br />
Re-test<br />
OK?<br />
No<br />
Yes<br />
Yes<br />
Correct it<br />
Correct it<br />
8355 N/B MAINTENANCE<br />
Symptom:<br />
An error occurs when a USB I/O device is installed.<br />
Test<br />
OK?<br />
Replace another known good USB<br />
device.<br />
Board-level<br />
Troubleshooting<br />
Replace<br />
Motherboard<br />
Check the following parts for cold solder or one of the following<br />
parts on the MB and Charge BD may be defective, use an<br />
oscilloscope to check the following signal or replace the parts<br />
one at a <strong>tim</strong>e and test after each replacement.<br />
Parts:<br />
U20<br />
U3<br />
U501<br />
J521-524<br />
R8<br />
R10-12<br />
C48<br />
C50<br />
L501<br />
L503<br />
L504<br />
L1<br />
L25<br />
L28<br />
L14<br />
L38<br />
R360-363<br />
R356-359<br />
C502<br />
C868<br />
C506<br />
C508<br />
R3<br />
R544<br />
C33<br />
C1<br />
C45<br />
R510<br />
R509<br />
C504<br />
Signals:<br />
+5VS<br />
USB_OC[0:3]#<br />
USBP0_P<br />
USBP0_N<br />
USBP1_P<br />
USBP1_N<br />
USBP2_P<br />
USBP2_N<br />
USBP3_P<br />
USBP3_N<br />
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