Lexmark CX310 Service Manual page 66

Actions
Step 4
Pull tray 1 out.
Does the display indicate InputS1‑Media Present...?
Step 5
Remove the tray, and inspect the sensor (A).
Is there something obstructing the sensor?
Step 6
Inspect the spring‑loaded shaft/flag (B) in the tray.
The flag portion of the shaft intercepts the sensor, except when a sheet
is being staged for duplexing.
Does the shaft rotate freely and return to home position (flag at top of
rotation?)
Step 7
is the flag on the shaft broken?
Yes
The sensor is
functioning correctly.
Remove the
obstruction, and
restart the test.
Go to step 7.
Replace the tray.
Diagnostic information
66
7527
No
Go to step 5.
Go to step 6.
Replace the tray with a
new one.
Go to step 8.