Lexmark W850n Service Manual page 127

Step
4 Check the sensor (pre-feed) for proper connection.
Is the above sensor connected properly?
5 Check the HCF feed unit cable assembly for proper
connection.
Is the above cable assembly connected properly?
6 Check the sensor (tray 5 feed-out) for proper operation.
1. Enter Diagnostics mode.
2. Select INPUT TRAY TESTS.
3. Select Sensor Tests.
4. Select Tray 5.
5. Select Feed-out.
Pull the HCF unit assembly from the printer.
Open the HCF top door assembly.
Does the display on the screen change every time the
actuator on the above sensor operates?
7 Check the sensor (tray 5 feed-out) for proper
connection.
Is the above sensor connected properly?
8 Check the HCF feed lift motor for proper operation.
1. Enter Diagnostics mode.
2. Select MOTOR TESTS.
3. Select Tray 5 feed mtr.
Does the above motor rotate normally?
9 Check the HCF feed lift motor for proper connection.
Is the above motor connected properly?
10 Check the HCF pick solenoid assembly for proper
operation.
Perform a print test from tray 5.
Does the HCF pick solenoid operate properly?
11 Check the HCF pick solenoid assembly for proper
connection.
Is the above component connected properly?
12 Perform a print test.
Does the error still occur?
Check Yes
Replace the sensor Replace the
(pre-feed). connection.
Go to "HCF sensor
(pre-feed) removal"
on page 4-137.
Go to step 6. Replace the
connection.
Go to step 8. Go to step 7.
Replace the sensor Replace the
(tray 5 feed-out). connection.
Go to "HCF sensor
(tray 5 feed-out)
removal" on
page 4-148.
Go to step 10. Go to step 9.
Replace the HCF Replace the
media feed lift motor. connection.
Go to step 12. Go to step 11.
Replace the HCF Replace the
pick solenoid. connection.
Go to "HCF pick
solenoid assembly
removal" on
page 4-136.
Replace the HCF Problem solved.
controller card
assembly.
Go to "HCF
controller card
assembly removal"
on page 4-152.
Go to step 13.
Diagnostic information
4024-110
No
2-71