Lexmark W850n Service Manual page 55

Step
3 Check the rolls for tray 2.
Remove tray 2, and check it.
Are the feed roll, separation roll, pick roll free of excess
wear and contamination?
4 Check the media position.
Open the printer left lower door assembly, and visually
check it.
Does the media touch the sensor (pre-feed) in the tray 2
media feed unit?
5 Check the sensor (pre-feed) in tray 2 for proper operation.
1. Select Diagnostics mode.
2. Select INPUT TRAY TESTS.
3. Select Sensor test.
4. Select Tray 2.
5. Select Pre-feed.
Remove the media tray assembly, and check it.
Does the display on the operator panel change every time a
white piece of paper is placed over the sensing area?
6 Check the sensor (pre-feed) connection.
Is the sensor (pre-feed) properly connected?
7 Check the media feed lift motor in tray 2 for proper
operation.
1. Enter Diagnostics mode.
2. Select MOTOR TESTS.
3. Select Tray 2 feed mtr.
Pull out tray 2, and check it.
Does the media feed lift motor rotate normally.
8 Check the media feed lift motor connection.
Is the media feed lift motor properly connected?
Check Yes
Go to step 4. Clean or replace
the feed roll,
separation roll,
and pick roll.
Go to
removal" on
page
"Separation roll
removal" on
page
"Pick roll
removal" on
page
Remove the Go to step 5.
media.
Ensure the media Go to step 6.
feed unit front
guide is installed
properly.
Go to step 7.
Replace the Replace the
sensor (pre-feed). connection.
Go to "Sensor Go to
(pre-feed) (pre-feed)
removal" on removal" on
page 4-38. page
Go to step 10. Go to step 8.
Go to step 9. Replace the
connection.
Go to
(pre-feed)
removal" on
page
Diagnostic information
4024-110
No
"Feed roll
4-42,
4-46, and
4-48.
"Sensor
4-38.
"Sensor
4-38.
2-35