U1-2340 : Over Heat Error)
1) Turn the machine off. Re-install the fuser unit. Then turn the machine on. Is the error message is disappeared?
2) If the problem persists, turn the machine off and remove the fuser unit.
a) Check if the fuser connector is connected properly.
b) Check if the input voltage is normal.
c) Check if the thermistor is twisted or contaminated.
3) After confirming continuity in the fuser connector and the problem still exists; order an SMPS/HVPS and Fuser Unit and install as is necessary.