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TROUBLESHOOTING
No power Power indicator does not light up.
Connect an AC adapter into the power jack.
Does the keyboard work? No
Yes
Check contact at battery springs. Measure voltage at pin 16 of IC AN8053N. Replace D101. Is the voltage +6.8 V? No Check contact of power switch. Check contact of the power jack. Clean the switch contacts. No Is it OK? Yes Yes
Replace the jack.
Check soldering at pins of the power jack.
Yes
Is it OK?
No
Check D102.
Solder the pins.
If D102 is defect, replace it.
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