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What does "Machine error 77" on my Brothers DCP 1000 mean??

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Heater thermistor short circuit. The thermistor is in the fuser unit that must be replaced.

Posted on Jul 04, 2010

  • barbarasztab Jul 04, 2010

    The problem has disappeared from my message window. I was able to make copies with no problem. Who knew??

  • Azrael SRL Jul 04, 2010

    That means that the drum and the fuser don't make a good contact. Take them out and clean the contacts, otherwise the problem will return.


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Machine error 77 means you hade either a Machine error 76 or Machine error 78 and turned the machine off. Sometimes the machines will give a false code and can be reset

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Message on machine states error 77, unplug and call brother?


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.

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Machine say error 77 call brothers


Power off the printer for 15 minutes and power back on again. If that fixes the problem then OK.
If not then go into maintenance mode -
Press and hold the menu/set key while turning on the machine. Wait until it comes completely up before releasing. It should say Maintenance in the display.

If not press function,*,2,8,6,4 within two seconds. It should say maintenance in the display. Or on some machines Menu,*,2,8,6,4 within 2 seconds.

Once you get it into maintenance hit 91 to do a parameter reset and than 99 to get out of maintenance.

If this corrects the problem then OK but you may have a failing thermister in the fuser.
If the problem happens again then change the thermister.

If the reset does not work then either the thermister or the fuser lamp has failed. In rare cases there is a poor connection with the cables to the fuser.

You will have to reset the parameter again after replacing the fuser if you need to replace the fuser or repair it.

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You have fuser failure. Replace the fax cause repair isn't worth the cost.

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It might be that the ph is clogged (mostly due to generic ink).

Run the manual cleaning procedure 3 times!

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Machine Error 76


Machine error 76 is a bad fuser lamp. Machine error 78 is a bad thermistor. Machine error 77 means you hade either a Machine error 76 or Machine error 78 and turned the machine off.
Sometimes the machines will give a false code and can be reset. Unplug machine. Hold down the Menu key while powering back up. You should still get a Machine error message. Enter the number 9...The display should change to Maintenance 9 then enter 1. The Machine error will return. Enter 99 and then make a test print. If you get either a machine error 76 or 78 you will need to have service done on your machine to have either the lamp or thermistor replaced, and depending on the usage of the machine, it might not be a bad idea to replace the entire fuser.

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