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Alot of the times that is caused by a bad fuser. Change your fuser to a new one if the fuser still continues with the error 40 and the fuser is OK then go into Service Diagnostics, NVRAM Access and run the "Clear Tech. Rep. Fault". What happens is that if the errors comes up more then 3 times it gets stuck in the engine control board So then you have to erase the engine cotrol board to start fresh with no faults or errors. Fuser part # 115R00025
possibly the fusers thermostat is displaced. it rides very close to the roller to get an accurate reading, look for 2 wires into a black "thing" toward the middle of the roller. this is a thermistor which sends its reading to the mainboard. check if the fuser is getting very warm, there is a thermo couple in series with the fusers power so it wont overheat but if its getting hot and the printer doesnt know it then the dammaged/displaced thermostat would be the thing to look for,
The fuser rollers (large orange rubber rollers visible with top cover open) are getting too hot, or the temperature sensor/wiring is faulty and misreading the temperature. Assuming sensor is okay, check the exhaust fan is running and expelling warm air as over time it will clog with dust and the fuser unit won't be cooled effectively.
. Turn the printer off, wait 10 minutes, and then turn the printer on. 2. If the message persists, reseat the fuser. If that does not work, replace the fuser. To check the fuser, turn the printer off and remove the fuser. Measure the resistance between the fuser connectors. If it is not within the proper range, replace the fuser. If there is not continuity between the fuser connectors neutral and hot with the fuser removed, replace the fuser. If the problem is not related to the fuser, replace the engine controller board.
To test fuser out of circuit make sure lamp and thermal fuse are not open circuit, and thermister is neither open or shorted
Fuser repair procedure from tec manual.
Fuser Failure (U4-1, U4-2, & U4-3)
1 Switch off printer main power. Remove the Fuser Full Cover so you can observe the Heat Rods. Switch on printer main power and observe the ends of the Fuser Assembly. The Heat Rods glow.?
| Go to step 5.
2 Replace the Printer Engine Controller PWB (REP 4.10.6). The error message reappears.
| Problem solved.
3 Replace the Fuser Assembly The error message reappears.
| Problem solved.
4 Check for a broken wire or a loose connection
5 Measure the AC voltage between J23-2 and J23-6 on the AC Driver PWB. There is 110VAC (or 220VAC if the printer is the 220VAC model) between J23-2 and J23-6.
| Go to step 7.
6 Replace the Fuser Assembly (REP 4.7.1). If the problem persists, replace the Printer Engine
Controller PWB (REP 4.10.6).
7 The Fuser cycles up and down.
| Replace the Printer Engine Controller PWB 8 Measure the voltage between P401-1 and P 401-4 when the Fuser Fan cycles up and down. There is 24VDC between P401-1 and P401-4 when the fan is rotating and 0VDC when the fan is off.?
| Replace the Printer Engine Controller PWB 9 Replace the AC Driver PWB
Please rate solution to your question "How can I check that new Fuser unit is ok?"
there is a 2 wire device (thermistor) that rests against the fuser roller to measure the temperauture. if the fuser is getting quite hot, suspect the thermistor to be either dirty (remove and clean it with alcohol) or defective. if fuser not getting hot, then suspect burned out fuser heater (look inside fuser roller for a long light bulb).
Basically the error message is telling you the printer cannot keep the fuser temperature at the proper temperature (too low). It could be a lot of things but typically it is due to a fuser assembly gone bad.