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Mitac 8080 Service Manual - laptop schematics, notebook ...

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8.9 USB Test Error<br />

<strong>8080</strong> N/B Maintenance<br />

An error occurs when a USB I/O device is installed.<br />

USB Test Error<br />

Check if the USB device is installed<br />

properly. (Including charge board.)<br />

Test<br />

OK?<br />

No<br />

Re-test<br />

OK?<br />

No<br />

Yes<br />

Replace another known good charge<br />

board or good USB device.<br />

Yes<br />

Correct it.<br />

Correct it.<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 mother-board may be defective, use an oscilloscope<br />

to check the following signal or replace the parts one at a time<br />

and test after each replacement.<br />

Parts:<br />

U3<br />

U8<br />

J510<br />

J512<br />

J3<br />

J506<br />

L39<br />

L40<br />

F501<br />

L526<br />

L525<br />

Transfer Board<br />

U1<br />

L12<br />

Signals:<br />

+5V_P<br />

USBOC0#<br />

USBP[0:3]+<br />

USBP [0:3] -<br />

USBOC3#<br />

USBOC1#<br />

124

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