Question about Brother MFC-7820N Laser Printer

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MFC 7820N printer says scanner locked when started

Posted by Anonymous on


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Igor Studennikoff

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SOURCE: I have a MFC-7820N printer.

clean mirrows in the scanner unit with the special liquid or 99% pure isopropyl

Posted on Nov 19, 2008



  • 1 Answer

SOURCE: is there a reset or fuse to restore power on a brother MFC-7820N

yes, there is a fuse, two actually, inside the unit. My 7820N died after a power surge. here is how I fixed it.

unplug the power cord
raise the glass/ feeder assembly
open the front cover and remove the toner cartride.
Remove the phillips screw on the right side of the printer (same side as the power switch)
open the back paper path cover and remove the phillips screw
Flip the printer on its side and using a small screwdriver, press in the tabs that hold on the side cover. as with everything plastic, be careful since things break easily.

Once the side cover is off, remove the screws holding down the large metal cover over the power supply
Remove the screws holding the circuit board.
remove the three connectors on the front side of the board and flip it around.

By the time you have reached this point, you have probably noticed little pieces of fuse and MOV scattered around the inside of the unit, assuming you had a good power spike.

The fuse that blew for me as a 4 amp, fast blow fuse. It is soldered into the circuit board. I unsoldered the ends of the fuse that remained and soldered in a new 4 amp 5x20mm fast blow fuse. the MOV was also blasted, but I didn't have one of those to replace it and you can't get them at Radio Shack. I'll just plug it into a surge suppressor which will accomplish the same thing.

After reassembling, I was back in business.

Posted on Mar 02, 2009



  • 2 Answers

SOURCE: Brother MFC-7820N Toner Problem

Open the cover, press Options and then *00.

Posted on May 22, 2009


  • 1 Answer

SOURCE: Problems with Brother MFC-7820N Laser Printer turns itself off

I just had same issue, it shared an outlet with a large volume work group copier, I unplugged it, opened and closed all compartments to make sure something open was not causing issues. I plugged it into different outlet and it appears to be back online. I have read some postings that this model has been known to draw over 15 amps. Its possible its starving for power. To test take to another room, plug in outlet by itself and see if it boots up.

Posted on Jun 01, 2009


  • 1 Answer

SOURCE: Bad Scan Quality Using Brother MFC-7820N Document Feeder

Look to the left side of the flatbed glass for a thin strip of glass by itself. When you scan from the glass, the document stays put and the sensor moves across the document. When you scan from the feeder, the sensor stays in that glass strip and the document moves across the sensor. See what I mean? I would check the small feeder glass for dirt or scratches from staples or other flotsam. Also not a bad idea to blow out the feeder path with some compressed air to ensure the documents is handled smoothly. Hope this helps!

Posted on Nov 11, 2009

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Brother MFC-7820N Printer--vertical lines

You need to clean the scanner glass. Also known as the strip glass. It is a 1 inch wide strip of glass that runs from the front to the back. Your documents pass over this glass when they are scanned. Some of the wax crayon probably smeared off onto the glass and now when you scan the scanner sees these marks as stationary and thus records them as solid lines. Just look into the scanner section where your documents are fed in or depending on model, some are just to the left of the large original glass.
Good Luck and thank you for using Fixya.

Feb 25, 2010 | Brother MFC-7820N Printer

1 Answer

Brother 7820N has black vertical line when using ADF

It's the same scanner ccd, after you make sure the narrow scanner window is clean, you need to power down the machine and power up again so it will calibrate to a clean window, if it has a scratch like from a staple, you will need a new glass.

Jan 18, 2010 | Brother MFC-7820N Printer

1 Answer

Scanner locked

look for a switch, or lever to unlock the scanner (behind it, maybe under the lid)

Feb 02, 2009 | Brother MFC-7820N Laser Printer

1 Answer

Brother MFC 7820N

how do i program one touch dialing on my brother MFC 7820N fax machine

Sep 09, 2008 | Brother MFC-7820N Laser Printer

1 Answer


Is it still working as a copier? If so then there may be something wrong with the printer's network interface or the networking at that jack or a problem with your switch. Have you tried moving it back to the old location or plugging the network cable into another wall jack, or changing ports on your switch?

Jun 24, 2008 | Brother MFC-7820N Laser Printer

1 Answer


Check smaller slit glass panel near copy top glass (open lid on left for liquid paper / dirt.

Oct 30, 2007 | Brother MFC-7820N Printer

1 Answer

Brother mFc 7820

I had work done on my laptop. I have a Brother MFC 7820N printer, scanner,fax,copier. I cannot find my cd for setting the drivers to have my laptop use the 7820N. Where can I pull the information down on line to enable my laptop to use my printer?

Shaun at [email protected]:

Oct 17, 2007 | Brother MFC-7820N Laser Printer

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