Operator Panel Display Blank, Printer Beeps Five Times And Pauses - Lexmark X543 Series Service Manual

Step Questions / actions
2 Turn the printer off, and remove the rear shield.
See "Rear shield removal" on page
Disconnect the operator panel assembly cable
at JOPP1 on the controller board. Turn on the
printer, and verify the following voltages:
Pin
2
4
5
6
7
Are the voltage values approximately correct?
Check continuity of the operator panel
3
assembly cable.
Is there continuity?

Operator panel display blank, printer beeps five times and pauses

Step Questions / actions
1 Turn off the printer, and remove the rear shield.
See "Rear shield removal" on page
Disconnect the cable at JOPP1 on the
controller board. Verify the following values:
Pin
1
2
3
4
5
6
7
Are all these values approximately correct?
2 Check for continuity in the operator panel cable
connector.
Do all the conductors indicate continuity?
4-7.
JOPP1
Voltage
+5 V dc
Ground
+5 V dc
+3.3 V dc
Ground
4-7.
JOPP1
Voltage
0 V dc
+5 V dc
0 V dc
Ground
+5 V dc
+3.3 V dc
Ground
Yes
Go to step 3.
Replace the operator panel
assembly. See "Operator
panel removal" on
page 4-77.
Yes
Go to step 2.
Replace the operator panel.
See "Operator panel
removal" on page 4-77.
7525-xxx
No
Replace the controller
board. See "Controller
board removal" on
page 4-16.
Replace the operator panel
cable. See "Op panel
cable" on page 4-80
No
Replace the controller
board. See "Controller
board removal" on
page 4-16.
Replace the operator panel
cable. See "Op panel
cable" on page 4-80
2-45
Diagnostic information