Operator Panel Display Blank, Printer Beeps Five Times And Pauses - Lexmark C540n Service Manual

5025-2xx, 4xx

Operator panel display blank, printer beeps five times and pauses

Step Questions / actions
Turn the printer off, and remove the rear
1
shield. See
"Top cover assembly removal"
on page 4-13.
Turn the printer on, and verify the following
values at JOPP1 on the controller board:
Pin
1
2
3
4
5
6
7
Are all these values approximately correct?
Turn the printer off, and check for continuity in
2
the operator panel cable.
Note: Remove the three screws holding the
operator panel, and place it facedown on top of
the printer. The cable connector pins will be
exposed and easier to contact.
Do all the conductors indicate continuity?
Service Manual
2-38
JOPP1
Value
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 logo
plate" on page 4-9.
No
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
Replace the front cover
assembly. See
"Front
cover assembly removal"
on page 4-2.
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