Fuser Service Check - Lexmark MS312 Service Manual

Error code Description
121.30 Fuser failed to reach printing temperature by the
time a page reached the fuser.
121.31 Fuser is too hot. Global temperature check.
121.32 Open fuser main thermistor.
121.33 Open fuser edge thermistor.
121.34 Open fuser backup roll thermistor.
121.35 Attempting to POR after receiving a 121.34.
121.36 Fuser did not heat to allow compression jog.
121.37 Fuser heated faster than allowed during line
voltage detection.

Fuser service check

Note: A 121.32 fuser error may occur if the ambient temperature is below the freezing point. Printers are
optimized to operate in an environment where temperature is between 60 and 90°F and relative
humidity is between 8 to 80%.
Action
Step 1
a
Restore the engine settings to their defaults:
Diagnostics Menu > Printer Setup > Defaults
b
Restore the EP setup settings to their defaults:
Diagnostics Menu > EP Setup > Defaults
Does the problem remain?
Step 2
•
Check the fuser cables JTHERM1 and JEXIT for proper
connection to the controller board.
•
Check the cable PCN5 for proper connection to the power
supply.
Are they properly connected?
Step 3
Are the cables JTHERM1, JEXIT and PCN5 free of damage?
Action
Go to
Diagnostics and troubleshooting
127
"Fuser service check" on page
Yes No
Go to step 2. The problem is
solved.
Go to step 3. Reseat the cables.
Go to step 4. Replace the fuser.
See
removal" on
page
4514-330
127.
"Fuser
276.