Brother Fax, MFC 4750, 5750, 4100, 4100E, 8300 – 76,77,78,79 Fuser Errors

 

Brother Fax, MFC 4750, 5750, 4100, 4100E, 8300, 8600 76, 77, 78 Fuser Errors

Brother MFC, fax, and printers are by far some of the best machines out there in today’s market. With their inexpensive cost, wide variety of features, and low-cost to maintain they are an obvious choice for any small to midsize business looking for a long-lasting durable machine. However, they can be prone to fuser errors. In this article, I will discuss why they get the error and how to possibly clear the message to avoid unwanted service expenses.Brother 4100 fuser error message photo

Situation

One day you come into your office or go to check your faxes and you notice your machine has one of four errors: 76, 77, 78, 79. All these errors are fuser related errors. 76 means an overheat issue, 77 is a general fuser error, 78 is a under heat error, and 79 is a defective thermistor error. At this point, you press a few buttons and eventually turn it off and back on only to be faced with the same error. If you call Brother Tech Support they will tell you to turn the machine off and let it set for ten minutes. Some machine service manuals even says to let it sit on for ten minutes and it should clear itself. I think I’ve only seen one machine reset itself. All other I’ve had to actually go into service mode and clear it myself.
Majority of the time, the error results in a sudden power outage where the power briefly turns off and on within a few seconds. You know when the lights flicker and your like what just happened. Usually during storms or when utility work is being done near by. I have a few companies that this happens a few times a year.

Why Brother Fax 4750, 5750 MFC 4100, 4100E, 8300, 8600 76, 77, and 78 Fuser Errors Happens

Brothers, like a lot of copiers, when they have fuser errors the machine needs to be put into a service mode to reset the code. People ask why? Well, if you run into a overheat issue if you turn the machine back on right after, it starts to heat up again which could result in melting the fuser pressure roller or in a worse case scenario start a fire. So, manufactures decided rather than have a law suit on their hands just to disable the machine until a repair man can come on site and diagnose the problem to avoid further damage to the machine. I have seen melted fuser pressure rollers, broken gears, and Brother did have an early mode printer that was known to have the fuser catch on fire so it’s something to take serious. Most of these recent errors though are a result of the machine being suddenly reset and it doesn’t properly power up. During the power up sequence the fuser lamp turns on an after a few seconds the thermistors read the correct temperature and the machine cycles to a ready state. When a machine resets all the sudden it skips a few steps and immediately checks the temperature which is usually wrong because it hasn’t had a chance to warm up so it throws an error code leaving you without a fax or printer until its reset.

How To Fix Brother Fax 4750, 5750 MFC 4100, 4100E, 8300, 8600 76, 77, and 78 Fuser Errors

First, since some of these can result in over heat issues I always recommend letting it sit unplugged for 1/2 hour. Hey, you might get lucky and plug it back in and it might start-up properly. Brother and other manufactures recommend this as a first action to take whenever you get a fuser error. This should allow the machines to sit long enough that it will carry out its regular power up cycle if it is a recoverable error. If not then we will have to put it in Maintenance Mode. To do this on most Brother Faxes, and MFC’s you need to press ( Menu, *, 2, 8, 6 ,4 ). Sounds easy right? It’s not. The button sequence has to be done within a few seconds or it will not work. I usually tell customers to get a beat in their head or say the sequence over and over in their head then press the buttons. It might take you a few times. The main thing a can say here is not to read the screen. Ill repeat, Do not read the screen just press the buttons. If done correctly the lights on the display will flash and the display will read MAINTENANCE. To reset the machine at this point just press 9,9 and the machine will exit maintenance mode and start its normal power up sequence. 99% of the time that’s all that needs done. If it doesn’t fix it you could try a 0,0 or a 0,1 in maintenance mode but these do restore settings so you might need to reconfigure your header and other settings. If that still doesn’t work then it’s probably time to call in a service technician to check the fuser out and possibly the power supply. Maintenance mode is not to be taken lightly. This isn’t a new toy on your fax machine. Certain modes can render your machine useless so only use it when necessary.

Hope that helps. If you have any questions just leave a comment below and I will further try to help you resolve your issue. On newer models they have life counters for parts like the fuser. Replace fuser messages don’t always mean you have a fuser issue, just that the fuser has reached its 100,000 PM cycle and needs replaced. Maybe, in a future article I will discuss this topic and explain in detail what actions need to take place.

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1 Comment
  1. Worked perfectly! Thanks!!

     

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