Lexmark CS748de User Manual

Diagnostic information 2-131
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Stripes display, distorted display, and other display issues
Print quality service check
Note: This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated
as supplies or maintenance items, which are the responsibility of the customer. With the customer's permission,
you may need to install a developer (toner) cartridge or photoconductor unit.
2
Check the operator panel assembly cable.
Is the cable damaged?
Replace the top cover
access assembly. See
“Top access cover
assembly removal” on
page 4-54.
Replace the system board.
See “System board
removal” on page 4-163.
Step Questions / actions Yes No
1 1. Turn off the printer.
2. Open the rear cover.
3. Reseat the operator panel cable (J2) on
the system board.
4. Check the J2 connector on the system
board for any damage.
Is the connector damaged?
Replace the system board.
See “System board
removal” on page 4-163.
Go to step 2.
2
1. Turn off the printer.
2. Disconnect the J2 operator panel cable.
3. Connect a new top access cover
assembly from outside of the machine for
verification.
Does the problem persist?
Return to the Old Top
access cover assembly,
then go to step 6.
Return to the Old Top
access cover assembly,
then go to step 3.
3
1. Open the top access cover assembly,
Refer to “Top access cover assembly
removal” on page 4-54.
2. Reseat the operator panel cable on both
ends.
3. Check for any damage on the cable.
Is the cable damaged?
Replace operator panel
cable. See “Operator
panel cable removal” on
page 4-140.
Go to step 4.
4
• For C746x:
Replace the 2.3 inch operator panel
assembly with card. See “Operator panel
assembly removal (C746)” on
page 4-34.
• For C748x:
Replace the UICC card. See “Operator
panel assembly removal (C748)” on
page 4-37.
Does the problem persist?
• For C746x:
Return the old 2.3 inch
operator panel
assembly with card,
then go to step 6.
• For C748x:
Return the old UICC
card, then go to step 5.
Problem resolved.
5
Replace the LCD panel.
Does the problem persist?
Go to step 6. Problem resolved.
6
Replace the Operator panel cable.
Does the problem persist?
For dead display. Go to
Dead printer service check.
Replace the system board.
See “System board
removal” on page 4-163.
Problem resolved.
Step Questions / actions Yes No

Lexmark CS748de Specifications

General

Brand	Lexmark
Model	CS748de
Category	Printer
Language	English