Lexmark CS748de User Manual

Diagnostic information 2-101
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920.05—POST (power-on self test) printhead motor not connected error service check
920.06—Input sensor service check
5
Connect a new cartridge motor1/fuser motor
cable to the old EP drive assembly without
installing it into the machine.
Did the error clear?
Replace the cartridge
motor 1/fuser motor cable.
See “Cartridge motor 1/
fuser cable removal” on
page 4-74.
Replace the system board.
See “System board
removal” on page 4-163.
Step Questions / actions Yes No
1 1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-47.
3. Reseat the cables in connector JMIRR1.
Does the error clear?
Problem resolved. Go to step 2.
2
Check the cables in connector JMIRR1 for
pinch points and any other damage to the
cables or connectors.
Is the cable damaged?
Replace the printhead. See
“Printhead removal,
installation, and
adjustment” on
page 4-153.
Go to step 3.
3
Measure the continuity across all of the fuses
on the system board.
Are any of the fuses blown?
Replace the system board.
See “System board
removal” on page 4-163.
Go to step 4.
4
1. Perform the printhead verification to check
whether the new printhead solves the
problem. See “Printhead verification”
on page 3-39.
2. Navigate to PRINTHEAD TESTS > Mirror
Motor Test.
Did the mirror motor pass the test?
Replace the printhead. See
“Printhead removal,
installation, and
adjustment” on
page 4-153.
Replace the system board.
See “System board
removal” on page 4-163.
Step Questions / actions Yes No
1 Is the input sensor flag damaged? Replace the paper pick
mechanism. See “Paper
pick mechanism
assembly removal” on
page 4-145.
Go to step 2.
2
1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-47.
3. Check the cable in connector JTRAY1 for
proper connection to the system board, for
pinch points, and any other damage to the
cable or connector.
Is the cable damaged?
Replace the paper pick
mechanism. See “Paper
pick mechanism
assembly removal” on
page 4-145.
Go to step 3.
Step Questions / actions Yes No

Lexmark CS748de Specifications

General

Brand	Lexmark
Model	CS748de
Category	Printer
Language	English