Lexmark C750 Service Manual page 144

5060-00x
The printer does not detect paper out in tray x when adequate paper is installed in the
tray.
Step Action and questions
1 Run tray x sensor test from the Diagnostics Menu.
Does the test pass for sensor L1?
2 Check the cable connection for the paper level sensing
assembly to tray x system board.
Is the cable correctly installed?
3 Check the paper level sensing assembly for correct
installation.
Is the paper level sensing assembly installed correctly?
4 Check continuity of the paper level sensing assembly
cable.
Do you measure continuity?
5 Check the paper level sensing assembly for correct
installation. Check the following for damaged or broken
parts:
• Paper level sensing flag bellcrank.
• Paper level sensing flag.
• Paper level sensing flag spring.
Is the paper level sensing assembly installed correctly?
6 Make sure the paper level sensing assembly arm goes
all the way to the bottom of tray x.
Does the arm extend all the way down to the bottom of
the tray?
The printer does not detect transparencies loaded in Tray x
Step Action and questions
1 Make sure the transparency material meets
specifications.
Does the transparency material meet specifications?
2 Check the transparency sensing assembly for correct
installation.
Is the transparency sensing assembly correctly
installed?
3 Check the transparency sensing assembly cable to
make sure the in-line connector is correctly installed to
Tray x system board cable.
Is the cable correctly installed?
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Service Manual
Yes No
Go to step 5 Go to step 2
Go to step 3 Install the cable
correctly
Go to step 4 Reinstall the
assembly if not
installed correctly
Go to step 5 Replace the cable
Replace the paper Go to step 6
level sensing
assembly
Recheck the arm. If See why the arm is
the problem not extending all
continues, replace the way to the
the paper leveling bottom of the tray.
sensing assembly. Repair as
If this does not fix necessary.
the problem,
replace the Tray x
system board.
Yes No
Go to step 2 Inform the
customer that the
transparency
media in tray x
does not meet
specification
Go to step 3 Install the
transparency
assembly correctly
Go to step 4 Install the cable
correctly