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

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Operator panel display is dim and unchanging

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
Are all these values approximately correct?
Check for continuity in the operator panel cable
2
connector.
Do all the conductors indicate continuity?

Op panel USB cable service check

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

USB service check

Step
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?
4-7.
JOPP1
Voltage
1 0 V dc
2 +5 V dc
3 0 V dc
4 Ground
5 +5 V dc
6 +3.3 V dc
7 Ground
Questions / actions
Questions / actions
Yes
Go to step 2.
Replace the operator panel.
See "Operator panel
removal" on page 4-76.
Yes
Replace the controller
board. See "Controller
board removal" on
page 4-16
Yes
Go to step 2.
Issue fixed.
Replace the RIP/system
board.See "Controller
board removal" on
page 4-16.
7525xxx
No
Replace the controller
board. See "Controller
board removal" on
page 4-16.
Replace the operator panel
cable. See "Op panel
cable" on page 4-79.
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.
2-47
Diagnostic information