Lexmark C543dn - Operator Panel Displays All Diamonds, no Beeps

Diagnostic information 2-39
5025-2xx, 4xx
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Operator panel displays all diamonds, no beeps
Step Questions / actions Yes No
1 Turn the printer off, and remove the rear
shield. See “Top cover assembly removal”
on page 4-13.
Disconnect the cable at JOPP1 on the
controller board. Verify the following values:
Are all these values approximately correct?
Go to step 2. Replace the controller
board. See “Controller
board removal” on
page 4-20.
2
Check for continuity in the operator panel
cable connector.
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?
Replace the operator panel.
See “Operator panel logo
plate” on page 4-9.
Replace the front cover
assembly. See “Front
cover assembly removal”
on page 4-2.
JOPP1
Pin Value
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