Lexmark X543 Service Manual page 106

7525-xxx
Step Questions / actions
11 Turn off the printer, and remove the rear shield.
"Rear shield removal" on page
Disconnect the cable at JOPT1 on the
controller board. Turn the printer on, and
measure the voltages below.
Are the voltages correct?
Pin
10
2-62
Service Manual
4-7.
JOPT1
Voltage
2 Ground
3 Ground
5 +24V
6 Ground
7 +5V
9 Ground
Ground
Yes
Consult your second level
support.
No
Replace the controller
board. See