Lexmark W840 Service Manual page 75

Step
4 Check the media position.
Open the printer left door assembly, and visually check
it.
Does the media touch the sensor (registration)?
5 Check the media position.
Open the 2TM/TTM left door assembly, and visually
check it.
Does the media touch the tray 4 feed-out sensor?
6 Check the sensor (registration) for proper operation.
1. Enter Diagnostics mode.
2. Select BASE SENSOR TESTS.
3. Select Media Path.
4. Select Registration.
Open the printer left door assembly, and visually check
it.
Does the display on the operator panel change every
time the actuator for the above sensor operates?
7 Check the sensor (registration) for proper connection.
Is the above sensor connected properly?
8 Check the sensor (tray 3 feed-out) for proper operation.
1. Enter Diagnostics mode.
2. Select INPUT TRAY TESTS.
3. Select Sensor Tests.
4. Select Tray 3.
5. Select Pre-feed.
Open the 2TM/TTM left door assembly, and visually
check it.
Does the display on the operator panel change every
time the actuator for the above sensor operates?
9 Check the sensor (tray 4 feed-out) for proper
connection.
Is the above sensor connected properly?
10 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
Remove the media. Go to step 5.
Remove the media. Go to step 6.
Go to step 8. Go to step 7.
Replace the sensor Replace the
(registration). connection.
Refer to the Printer
Service Manual.
Go to step 10. Go to step 9.
Replace the sensor Replace the
(tray 4 feed-out). connection.
Go to "2X 500-
sheet drawer
(2TM)—sensor
(tray 4 feed-out)
removal" on
page 4-38.
Go to step 11. Replace the
connection.
Diagnostic information
4024-XXX
No
2-19