Lexmark W850n Service Manual page 93

Step
4 Check the pipe, located on the lower part of the toner
cartridge for debris.
Is the pipe, located on the lower part of the toner cartridge
guide assembly, clogged?
5 Check the sensor (RFID toner cartridge) for proper
installation.
6 Check the sensor (RFID toner cartridge) for proper
connection.
7 Check the toner add motor assembly for operation.
Warning: Only perform this test in segments of three
seconds or less, or toner spill will occur.
1. Enter Diagnostics mode.
2. Select MOTOR TESTS.
3. Select Toner add motor.
Does the motor rotate normally?
8 Check the toner add motor assembly connection.
Is the toner add motor assembly properly connected?
9 Perform a print test.
Does the error continue?
Check Yes
Go to step 5. Clean the pipe.
Go to step 6. Install the sensor
(RFID toner
cartridge)
correctly.
Replace the Replace the
sensor (RFID connection.
toner cartridge).
Go to "Toner
cartridge guide
assembly
removal" on
page 4-93.
Go to step 9. Go to step 8.
Replace the toner Replace the
add motor. connection.
Go to "Toner
cartridge guide
assembly
removal" on
page 4-93
Replace the Problem solved.
printer engine card
assembly.
Go to "Printer
engine card
assembly
removal" on
page 4-119.
Diagnostic information
4024-110
No
2-73