Operator Panel Display Is Dim And Unchanging; Op Panel Usb Cable Service Check; Usb Service Check - Lexmark X543 Service Manual

7525-xxx

Operator panel display is dim and unchanging

Step Questions / actions
Turn off the printer, and remove the rear
1
shield. See
"Rear shield removal" on
4-7. Disconnect the cable at JOPP1 on
page
the controller board. Verify the following
values:
Pin
1
2
3
4
5
6
7
Are all these values approximately correct?
Check for continuity in the operator panel
2
cable connector.
Do all the conductors indicate continuity?

Op panel USB cable service check

Step Questions / actions
1 Check the op panel USB cable for
continuity.
Is there continuity?

USB service check

Step Questions / actions
1 Is the USB cable properly connected to the
MFP and host PC?
2 Try a different USB cable. Does this fix the
issue?
3 Connect a different device to the USB cable.
Did the host PC see the device?
Service Manual
2-48
JOPP1
Voltage
0 V dc
+5 V dc
0 V dc
Ground
+5 V dc
+3.3 V dc
Ground
Yes
Go to step 2.
Replace the operator panel.
See
"Operator panel
removal" on page 4-103.
Yes
Replace the controller
board. See
"Controller
board removal" on
page 4-18
Yes
Go to step 2.
Issue fixed.
Replace the RIP/system
board.See
"Controller
board removal" on
page 4-18.
No
Replace the controller
board. See
"Controller
board removal" on
page 4-18.
Replace the operator panel
cable. See
"Op panel
cable" on page 4-106.
No
Replace the Op panel USB
cable.
No
Properly connect the cable
at both ends.
Go to step 3.
There is an issue with the
host machine.
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