Sharp MX-C507P Service Manual page 237

Error code Description
121.81 Open fuser backup roll thermistor was detected.
121.82 Open fuser second backup roll thermistor was
detected.
121.83 Open fuser narrow media backup roll thermistor
was detected.
121.84 Non‑contact sensor (BUR) is missing.
121.86 Fuser backup roll thermistor temperature is out of
range.
121.87 Fuser backup roll thermistor temperature change
rate is out of range.
121.88 Fuser second backup roll thermistor temperature is
out of range.
121.89 Fuser second backup roll thermistor temperature
change rate is out of range.
121.90 Fuser non‑contact backup roll thermistor
temperature is out of range.
121.91 Fuser non‑contact backup roll thermistor
temperature change rate is out of range.
Fuser service check
Action
Step 1
Check the fuser for proper installation.
Is the fuser properly installed?
Step 2
Reinstall the fuser.
Does the problem remain?
Step 3
Check the LVPS cable on the LVPS and on the JFSNS connector
on the controller for proper connection.
Is the cable properly connected at both ends?
Step 4
Reconnect the cable.
Does the problem remain?
Diagnostics and troubleshooting
203
Action
See "Fuser service check" on page
Yes
Go to step 3.
Go to step 3.
Go to step 5.
Go to step 5.
5028
203.
No
Go to step 2.
The problem is
solved.
Go to step 4.
The problem is
solved.