Question about Brother IntelliFAX 4100 Laser Fax

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Machine error 7C

Can you please explain to me what "machine error 7C" means? I can not locate our user manual in our office.

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Re: machine error 7C - Brother IntelliFAX 4100 Laser Fax Fax Machines

Machine error 7c

Posted on Aug 15, 2008

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Re: machine error 7C

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Brother Intellifax 4100 error message 7C - unplug and call Brother

7C indicates a Engine PCB error.

PCB=Printed Circuit Board.

This is a service error and will need a technician to replace / repair the PCB.

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Error 7C

There's no manual for "machine error 7C" in Bro IntelliFax 4100. To fix this issue. You will need to pull out the toner. Note: the toner and drum are connected.....At the left corner of the drum. You will see a blue tab......You will need to slide the blue tab back and forth for 20th times....And put the toner back in its place.....This is just a temp fix but you need to replace the drum to have it working its fullest......

Dec 24, 2008 | Brother IntelliFAX 4100 Laser Fax

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worst case scenerio is your engine board has gone bad. first though, try a new brother brand DR400. a faulty/binding drum unit can cause this. usually happens with generic brands.


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Laser scanner error. Replace laser unit

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Machine code question

Hi Alexandra,
I hate to be the messenger of bad news but Machine Error 7C mean Engine PCB Error. This error code is for servicer reference and may not appear on the service manual. If it does, it will tell you to unplug the unit and try again. If the problem persists, you have to bring it to an Authorized Brother Service center for repair.

The link below will take you to a Service Manual page where the error code is defined.

Best Regards,

Jan 15, 2008 | Brother IntelliFAX 4100 Laser Fax

1 Answer

Slow receipt of fax

Presumably, no -one has changed any settings on the machine. If the problem occurs on all received faxes, I would suspect the tel line. The machine automatically slows down the data reception to the slowest speed necessary to receive clean data. What that means is, there is unacceptable noise somewhere on the line, due to a bad connection between the machine and the tel pbx. To check this, try a different location, either the previous one or even a different jack in the office.

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