Lexmark X850E - Fuser Unit Assembly on Time Failure; Over Heat Temperature Failure

Diagnostic information 2-161
7500-XXX
920.00 Fuser unit assembly on time failure
921.00 Over heat temperature failure
Step Check Yes No
1 Check the fuser unit assembly for a media jam.
Open the printer left door assembly and check it.
Is there a media jam in the fuser unit assembly?
Remove the
media.
Go to step 2.
2 Leave the printer powered on with the error code displayed
for 10 minutes, then perform a POR.
Does the error still occur?
Go to step 3. Problem solved.
3 Check the fuser unit assembly for proper installation.
Open the printer left door assembly and check it.
Is the fuser unit assembly installed properly?
Go to step 4. Install the fuser
unit assembly
properly.
4 Check the fuser unit assembly connection.
Is the fuser unit assembly properly connected?
Go to step 5. Replace the
connection.
5 Check between the LVPS card assembly P525 and the
printer engine card assembly P401 for proper connection.
Are the cards connected properly?
Replace the fuser
unit assembly.
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 unit assembly for proper installation.
Open the printer left door assembly and check it.
Is the fuser unit assembly installed properly?
Go to step 2. Install the fuser
unit assembly
properly.
2 Check the fuser unit assembly for proper connection. Go to step 3. Replace the
connection.
3 Check the connection between the LVPS card assembly
P525 and the printer engine card assembly P401.
Are the cards connected properly?
Replace the fuser
unit assembly.
Replace the
connection.
4 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.