Lexmark 4076-0XX - Manual (Page 25)

4076-0XX
Diagnostic Information 13
Operator Panel Service Check
FRU OR PROCEDURE ACTION
1 Power Supply Disconnect J11 from the system
board and check the following volt-
ages on the power supply cable:
J11-1 to GND = +5V dc
J11-3 to GND = +24V dc
If you do not have correct voltage,
replace the power supply. Be sure to
unplug the machine before you recon-
nect the power supply to the system
board.
2 System Board Turn the printer on. Check for +5 V dc
at test point CE/TP near the operator
panel connector on the system board
3 Operator Panel Cover The operator panel cover actuates
the operator panel sensor on the
operator panel. Check the cover for
any broken parts. Check the operator
panel sensor for dirt.
4 Operator Panel Card
Operator Panel Cable Check the operator panel cable for
continuity. If the cable is good,
replace the operator panel. If the
symptom remains, replace the sys-
tem board.