Question about Brother IntelliFAX 4750 Plain Paper Laser Fax

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Machine error 78 offline

On power up I get the error "machine error 78 offline" on my brother intellifax 4750. any ideas what it might be brother just says take to a dealer.

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You have a bad FUSER. There's nothing you can do. A dealer must replace the fuser.

Posted on Oct 26, 2008

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Error Code 77 on brother 4100 fax intelifox business class


( 76 Heater harness disconnected or broken. Or heater thermistor harness
disconnected or broken when the power is turned on, the front cover is
opened and closed, or the machine exits from the sleep mode. )
( 77 Power turned off and on at the occurrence of error 76 or 78. )
( 78 Heater thermistor short-circuited. Or heater thermistor harness disconnected
or broken when the machine is on standby. )

Nov 05, 2010 | Brother IntelliFAX 4100 Laser Fax

1 Answer

Get error 78 comes up on my brother machine after I changed the drum and toner


heater thermistor harness disconnected or broken. replace it or replace fuser unit

Jul 18, 2009 | Brother IntelliFAX 4750 Plain Paper Laser...

1 Answer

Just replaced drum unit in our brother 4750e intellifax, now makes horrible squealing sound when printing. Ideas how to fix?


the drum is not set good please remove the drum and install it again something you do wrong.
Check do the drum is`set good.

Jul 15, 2009 | Brother IntelliFAX 4750 Plain Paper Laser...

1 Answer

I have a intellifax 4750e and getting error code 77 unplug and


We have a Brother 4750. Experienced a power outage. Now it's giving a message of "error77" what do we do?

Dec 20, 2008 | Brother Fax Machines

1 Answer

Machine error 76 for brother fax 4750


The error is related to the fuser assembly overheating. The only course of action you could take would be to turn off the machine for an hour or so to give the memory time to reset. If that does not resolve the problem, then the fuser assembly needs replacement (Part# LJ7759001). This should be replace by a certified tech.

Hope this helps!

May 21, 2008 | Brother IntelliFAX 4750 Plain Paper Laser...

1 Answer

Brother Fax 4750 System error 76


try resetting the machine by pushing the features button, and then *2864 in quick succesion, if done correctly you will enter test mode, then enter 91, and then after that clears enter 99 to exit test mode. make a copy to see if it works, and if it doesn't it is time to replace the fixing assy.

Apr 17, 2008 | Brother IntelliFAX 4750 Plain Paper Laser...

1 Answer

Brother 4750 fuser replacement


The entire front, sides, and rear cover is all one piece. Take the screws out and lift straight up.

Dec 14, 2007 | Brother IntelliFAX 4750 Plain Paper Laser...

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