Lexmark W840 Service Manual page 77

Step
5 Check the tray 4 pre-feed sensor for proper operation.
1. Enter Diagnostics mode.
2. Select INPUT TRAY TESTS.
3. Select Sensor Tests.
4. Select Tray 4.
5. Select Pre-feed.
Remove the media tray assembly.
Does the display on the operator panel change every
time a white piece of paper is placed over the sensing
area of the above sensor?
6 Check the tray 4 pre-feed sensor for proper connection.
Is the above sensor connected properly?
7 Check the 2TM/TTM controller card assembly and the
printer engine card assembly for proper connection.
Are connectors P541 and P413 on the above cards
connected properly?
8 Check the tray 4 media feed lift motor for proper
operation.
1. Enter Diagnostics mode.
2. Select MOTOR TESTS.
3. Select Tray 4 feed mtr.
Does the above media feed lift motor rotate properly?
9 Check the tray 4 media feed lift motor for proper
connection.
Is the above media feed lift motor connected properly?
10 Check the tray 4 media feed lift motor for proper
operation.
Replace the media feed lift motor for tray 4 with that for
tray 3.
Does the replaced media feed lift motor operate
properly?
1. Enter Diagnostics mode.
2. Select MOTOR TESTS.
3. Select Tray 4 feed mtr.
Does the above media feed lift motor rotate properly?
11 Check the 2TM/TTM controller card assembly and the
printer engine card assembly for proper connection.
Are connectors P541 and P413 on the above cards
connected properly?
Check Yes
Ensure the Feed unit Go to step 6.
front guide is
properly installed.
Go to step 7.
Replace the sensor Replace the
(pre-feed). connection.
Go to "2X 500-
sheet drawer
(2TM)—sensor
(pre-feed) removal"
on page 4-25.
Go to step 10. Replace the
connection.
Go to step 11. Go to step 9.
Go to step 10. Replace the
connection.
Reinstall the media Go to step 11.
feed lift motor for
tray 3 as it
previously was, and
then replace the
media feed lift motor
for tray 4 with a new
one.
Go to "2X 500-
sheet drawer
(2TM)—media feed
lift motor removal"
on page 4-17.
Go to step 12. Replace the
connection.
Diagnostic information
4024-XXX
No
2-21