Lexmark C750 Service Manual page 150

5060-00x
Step D
Step Action and questions
1 Enter the Diagnostics Mode and select the Tray 1
Sensor Test from the Input Tray Tests menu. You can
activate the paper level sensor inside the printer. The
paper level sensor is a dual sensor and checks the
following levels for tray 1.
The tray 1 level sensor is a dual sensor assembly that
senses when tray 1 is empty, nearly empty, or partially
empty.
Does the sensor test pass?
2 Paper level sensing assembly—make sure the
assembly is not loose or damaged. Make sure the arm
is not broken.
Are any parts loose or broken?
3 Check the paper level sensing cable for correct
installation at J69 on the engine board and to the paper
level sensing dual sensor assembly.
Is the cable connected correctly?
4 Check the paper level sensing assembly flag for correct
installation and the flag is not broken or damaged.
Is the paper level sensing assembly installed correctly
and the flag not broken or damaged?
5 Check continuity of the paper level sensing cable.
Is there continuity?
6 Check the voltage at J69-1. It should measure
approximately +5 V dc.
Is the voltage correct?
Step E
Step Action and questions
1 Check the make sure that the transparency material
installed in Tray 1 meets machine requirements.
Does the media meet requirements?
2 Check the following for correct installation and signs of
broken or damaged parts:
• Transparency lift arm
• Transparency lift link
Is the transparency sensor assembly installed correctly,
not damaged or broken?
2-116
Service Manual
Yes No
Call your next level Go to step 2
support.
Repair or replace Go to step 3
parts as necessary.
Go to step 4 Install the cable
correctly
Go to step 5 Install correctly or
replace the flag if
damaged or broken
Go to step 6 Replace the level
sensing cable
Replace the level Replace the engine
sensing assembly. board. See
"Engine board
removal" on
page
Yes No
Go to step 2 Inform the
customer
Go to step 3 Replace the
autocompensator.
See
"Autocompensat
or pick assembly
removal" on
page
4-29.
4-17.