04 keyboard error or interface error & keyboard 无作用, ps2/mouse 无作用
a. 8042 (k/b bios)
1. 查看k/b connector有无open or short or 折脚or connector本身之夹pin不良
2. 查k/b clk (8042 pin 3) 之信号及相关之线路,零件有无open or short
3. 查k/b reset (8042 pin 4) 之信号及相关之线路,零件有无open or short
4. 查cs, ior, iow (8042 pin 6, 8, 10) 之信号及相关之线路,零件有无open or short
5. 查sa2 (8042 pin 9) 之信号及相关之线路,零件有无open or short
6. 查k/b connector之vcc, gnd pin相关之线路,零件有无open or short
7. 查k/b connector之kdata, kclk pin相关之线路,零件 (7406) 有无open or short
8. 查k/b connector至k/b bios之线路及相关之零件有无open or short
9. 查irq1 (8042 pin 35) 至相关之chip及线路有无open or short
10.查keylock (8042 pin 34) 之信号是否正确有无short
11.查cpu之intr相关之线路,零件有无open or short (开机时irq1在check k/b bios后会由high → low, 若按f1 key当则irq1会由low → high)
b. k/b bios作于chip内 (如w83977, ali1543, sis5571, 559x)
1. 参考a项之方法维修
msolist style="text-justify: inter-ideograph; margin: 0cm 0cm 0pt 17pt; text-indent: -17pt; text-align: justify; mso-list: l69 level1 lfo129; tab-stops: list 18.0pt">2. 送至w83977 pin1之24mhz频率是否正确
3. 参考该chip之data sheet
c. ps/mouse 无作用
1. 查看ps/mouse connector有无open or short or 折脚or connector本身之夹pin不良
2. 查ps2/mouse connector之vcc, gnd pin相关之线路,零件有无open or short
3. 查ps2/mouse connector之mdata, mclk pin相关之线路,零件 (7406) 有无open or short
4. 查irq12至相关之chip及线路有无open or short
补 充 :
1. k/b connector若为双层 (k/b & ps2/mouse) 之connector则须注意如果碰到同时插上k/b及ps2/mouse时k/b无作用,可能为双层之connector内部pin变形与外壳short造成1. chip intel82371之test#(pin v18),正确工作电压为3v,若线路open则造成振荡器(32.768mhz)不振荡
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