How do you replace the thermistor ? Is it in the toner cartridge ?

Is this brand new unit let me know.

it means fuser temperature is abnormally low, check halogen bulb works , then check thermistor, and thermostat ,

In my experience if you refill the toner cartridge with the toners available in the market,though they are labelled"for Brother 2140" you get vertical dark patches on the paper. Once in a while you get good quality print too. Replacement with correct toner cartridge seems to the solution.

hi
check this video it is very easy
i have try 3 times in the same cartridge
and works just like the original


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U2 40 is a CRUM comunication error with the toner (wrong toner chip on toner cartridge or wrong toner cartridge) try a new toner.
H4 is a fuser trouble code. Check to make sure all conection are right, Theres a few posible problems for H4, power board, MCU board, thermistor, or broken heat lamp.

Error 77 basically means- Heater thermistor short circuit. However, the message is sometimes incorrectly shown. You can try this- power off the machine, take out the cartridge, close the door and power up. The machine should notice either the toner or the front door is not in place. Now open the door and place the toner. This might solve the problem. You can also try to soft reset the printer. If none of these works, you might have to change the thermistor.

F2:
00:TONER SENSOR
02:TONER SUPPLY PROBLEM
04:WRONG COUNTRY,WRONG CARTRIDGE,DRUM
05:DRUM PROBLEM,WRONG CARTRIDGE
39:PROCESS UNIT THERMISTOR PROBLEMS
58:PROCESS HUMIDITY SENSOR PROBLEM

After replacing the toner cartridge you did remove the plastic strip that holds the toner in place?? If you did, on the control panel is a little sunken black button. Just take a pen or then object and hold the button down until the light goes off. This can take up to ten minutes to go off.

Try www.copiertoner.net for spares.

Please take your unit to an Authorized Service Center ASAP. Do not tur on the unit again. That burned fuse means that the temperature sensors inside the printer (thermistors) are not working correctly and the unit is overheating.

That is a fuser erron code. Abnormal temperature. You will need to replace the fuser. Sometimes I have sen a buildup of toner on the thermistor. If you can get to it. You can try to clean the toner off. Be careful. Very hot.

I’m happy to help further over the phone at https://www.6ya.com/expert/jayw_0e86fb055a7b73de