8Ć42 Troubleshooting
C4699Ć90000
This tests the operation of the frontĆpanel keys.
In service mode , press
Front-Panel Test.
All LEDs flash a further two or three times and then turn OFF.
Press any frontĆpanel key except Shift.
If the key is operating correctly, the
Fast
LED stays on (steady) until you take
your finger off the key
Repeat step for each key except
Shift.
Finally, press the
Shift key.
If this key is working correctly, the
Fast
LED comes on briefly, and then all LEDs
begin to flash to indicate that the test has ended.
Key Working OK
Test Ended
Front-Panel
Test
Key Working OK
Shift
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