Operator Panel Service Check; One Or More Operator Panel Buttons Fail - Lexmark C540n Service Manual

5025-2xx, 4xx

Operator panel service check

Replace one of the following components, and perform a POR before replacing a second
Warning:
component. Never replace both of the components without performing a POR after installing each
one, or the printer will be rendered inoperable:
Operator panel assembly
•
Controller board
•
Never install and remove components listed above as a method of troubleshooting components.
Warning:
Once a component has been installed in a printer, and the printer is powered on, it cannot be
used in another printer. It must be returned to the manufacturer.

One or more operator panel buttons fail

Step Questions / actions
Enter Diagnostics Menu (turn the printer off,
1
press and hold
and then release the buttons when the
installed memory and processor speed
displays).
Perform the Panel Test. See
3-11. The Panel Test should show
page
alternating display of all pixels on, and all
pixels off. Press Stop to end the test.
Did the test show errors on the display?
Perform the Button Test. See
2
in Diagnostics Menu.
on page 3-12
Did any of the buttons fail the test?
Remove the rear shield.
3
assembly removal" on page
Turn the printer on, and verify the following
values at JOPP1:
Pin
2
4
5
6
7
Are the values approximately correct?
Service Manual
2-36
and , turn the printer on,
"Panel Test" on
"Button Test"
"Top cover
4-13.
JOPP1
Value
+5 V dc
Ground
+5 V dc
+3.3 V dc
Ground
Yes
Replace the operator panel
assembly. See
"Operator
panel logo plate" on
page 4-9.
Replace the operator panel
assembly. See
"Operator
panel logo plate" on
page 4-9.
Replace the operator panel.
See
"Operator panel logo
plate" on page 4-9.
If this does not fix the
problem, replace the front
cover assembly which
contains the operator panel
cables. See
"Front cover
assembly removal" on
page 4-2.
No
Go to step 2.
Go to step 3.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
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