IBM PC 300, Maintenance Service Manual

Page: 75 / 163

75
Keyboard
001 - START
Power off the system unit and make sure that the keyboard plug is connected properly.
002 -
Insert the diagnostics diskette into the diskette drive and power on the system unit.
Select Interactive Tests menu, then execute Keyboard test.
003 - DOES THE KEYBOARD FUNCTION CORRECTLY? (YES, READ AHEAD. NO, GO TO STEP 004.)
Keyboard is functioning normally.
End.
004 - ARE THERE ANY STUCK KEYS OR ANY GRIME IN THE GAP OF KEYCAPS? (YES, READ AHEAD. NO, GO TO
STEP 005.)
Power off the system unit. Carefully remove the grime and solve the stuck keys problem.
Go to step 001.
005 - ARE THERE ANY BROKEN PINS IN THE KEYBOARD PLUG? (YES, GO TO STEP 007. NO, READ AHEAD.)
Try with a known good keyboard.
006 - DOES THE ERROR SYMPTOM STILL REMAIN? (YES, READ AHEAD. NO, GO TO STEP 007.)
Replace the system board.
End.
007 -
Replace the keyboard.
End.