Lexmark X850E - Fuser Cooling Fan Failure

2-156 MFP Service Manual
7500-XXX
915.00 Fuser cooling fan failure
2 Check the gear rotation for the toner cartridge guide
assembly.
Remove the toner guide assembly.
Does the gear, located at the lower part of the toner
cartridge guide assembly, rotate smoothly?
Go to step 3. Replace the toner
cartridge guide
assembly.
3 Check the toner cartridge guide assembly for pipe clogging.
Is the pipe, located at the lower part of the toner cartridge
guide assembly, clogged?
Go to step 4. Clean the pipe.
4 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.
Remove the top cover assembly. Go to “Top cover
assembly removal” on page 4-5.
Override the switch (printer front door interlock)
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch Printer Motor Test.
4. Touch Toner add motor.
Observe the toner add motor for rotation.
Note: When performing this test, the drum unit motor will
also operate.
Does the motor rotate normally?
Go to step 6. Go to step 5.
5 Check the toner add motor assembly connection.
Is the toner add motor assembly properly connected?
Replace the toner
add motor.
“Toner cartridge
guide assembly
removal” on
page 4-95
Replace the
connection.
6 Perform a print test.
Does the error continue?
Replace the
printer engine card
assembly.
Go to “Printer
engine card
assembly
removal” on
page 4-117.
Problem solved.
Step Check Yes No
1 Check the fuser cooling fan for proper installation.
Is the fuser cooling fan installed properly?
Go to step 2. Install the fuser
cooling fan
properly.
2 Visually check the fuser cooling fan for rotation.
Is the fuser cooling fan visually rotating?
Go to step 5. Go to step 3.
Step Check Yes No