Mitac 8080 Service Manual - laptop schematics, notebook ...
Mitac 8080 Service Manual - laptop schematics, notebook ...
Mitac 8080 Service Manual - laptop schematics, notebook ...
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<strong>8080</strong> N/B Maintenance<br />
8.6 Keyboard (K/B) Touch-Pad (T/P) Test Error<br />
Error message of keyboard or touch-pad failure is shown or any key does not work.<br />
Keyboard or Touch-Pad<br />
Test Error<br />
Is K/B or T/P<br />
cable connected to <strong>notebook</strong><br />
properly?<br />
Try another known good Keyboard<br />
or Touch-pad.<br />
Test<br />
Ok?<br />
Yes<br />
No<br />
Yes<br />
No<br />
Correct it.<br />
Replace the faulty<br />
Keyboard or Touch-Pad.<br />
Board-level<br />
Troubleshooting<br />
Replace<br />
Motherboard<br />
Check<br />
U504, J1, J2<br />
for cold solder?<br />
No<br />
Yes<br />
Re-soldering.<br />
One of the following parts or signals on the motherboard<br />
may be defective, use an oscilloscope to check the signals<br />
or replace the parts one at a time and test after each<br />
replacement.<br />
Parts<br />
U510<br />
U504<br />
J1,J2<br />
SW3~SW8<br />
SW502~SW507<br />
F3<br />
L20<br />
L22,L23<br />
R227,R228<br />
R615<br />
X502<br />
Signals<br />
H8_VDDA<br />
SA2<br />
IRQ1<br />
IRQ12<br />
IOR#<br />
IOW#<br />
KI[0:7]<br />
KO[0:15]<br />
T_CLK<br />
T_DATA<br />
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