Front Panel Test; 42 Troubleshooting - HP DesignJet 250C Service Manual

Front Panel Test

This tests the operation of the front panel keys.
1 In service mode 1, press
All LEDs flash a further two or three times and then turn OFF.
2 Press any front panel key except
Status: If the key is operating correctly, the
your finger off the key
3 Repeat step 2 for each key except
4 Finally, press the
Shift
If this key is working correctly, the
begin to flash to indicate that the test has ended.

8 42 Troubleshooting

.
Front-Panel Test
.
Shift
Fast
.
Shift
key.
LED comes on briefly, and then all LEDs
Fast
Key Working OK
LED stays on (steady) until you take
Test Ended
Front-Panel
Test
Key Working OK
Shift
C4699 90000