Question about Brother MFC-8840D All-In-One Laser Printer

1 Answer

Fuser Gear Md No. LJ 7416

Hi Guys.

I was given  this all-in -one unit, "if you can fix it, it's yours" senario. I've pulled appart the fuser and found two problems. The LJ 7416 gear has snaped in three places (need a new one) and the gear that drives this gear is slightly worn on the edges (will this need to be replaced?)

How much for the LJ 7416

Thanks for your time guys.


Posted by Dal B on

  • Dal B Oct 28, 2007

    Thanks Soulvistor, best advice. I will do that. I also have the HP OJ G85 from new, only problem was scanner failure, after a good clean it's still going strong!

    Thanks again Dal B

  • Anonymous Dec 07, 2007


    I am having the same problem, but i don't know how to open up to get to the fuser, Is there anyway i can get a service manual or some advice. Thank first



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  • Brother Master
  • 1,113 Answers

You will need to purchase these gears from a brother dealer but I warn against just changing the gears you mention, fuser driver gear in printer frame will be ok unless chipped, but usally the big gear on the fuser goes as does a little white one next to it, and these are breaking becase the fuser is hard to turn, if you just change the gear, the fault will reappear after a little use, best bet is to replace fuser assy (approx $150)

Posted on Oct 27, 2007

  • Soulvisitor
    Soulvisitor Dec 08, 2007

    David.. face back of printer one screw centre, panel comes off, now door can come off then right and left rear cover screw off, the unswer fuser and unplug.

  • Soulvisitor
    Soulvisitor Dec 16, 2007

    parts LINK



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I am not clear as the whether you put the errant fuser in the machine that was working and put the good fuser in the bad one so now you have 2 that don't work. If that is the case it is possible that the bad fuser has taken out the good machine. There are resistance tests that should be run on the fuser to see if it is shorted out. If it does short out, you may need to replace an internal fuse or link on the board.

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Hello zeksvc,
The "Printer has an internal Hardware problem!"
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1 Answer

Hi there, i have an hp 3500 printer. the fuser was ript appart and needed replacment.(the rol was broken on one side and was not burning the inkt on the paper anymore) i have got a new one, but keep...

50.9 error - Fuser Failure (Abnormally High
Temperature Sub Thermistor)
1. The connector between the fuser and
the printer is not connected properly.
Reseat the fuser. Check the connector J5013
between the fuser and the printer. Replace it
if damaged.
2. Short in the sub thermistor. Turn the
printer off and remove the fuser. Measure the
resistance between the fuser connectors
J5013LA-4 (SUBTH) and J5013LA-3
(+3.3V). If it reads 600 ohms or below (at
ambient temperature), replace the fuser.
3. Faulty DC controller PCB, replace the
DC controller PCB.

I think you've some problems on the connectors, check the connections.
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My four year old (not heavily used) HP Laserjet has developed a fault in that on each piece of printed paper I am getting 5 indents on the left hand side of the paper and on the right hand side the paper...

yep, know exactly what it is, your machine needs a new fuser unit, non simply change, requires the machine to be totally pulled appart to get the fuser out, these I normally quote 2Hrs labour to do, and thats after you have done them a few times, the fuser itself will have the coating falling off the ends, causing your creasing and smudging...

There are only two things it can be pretty good chance like 90% its the fuser, but just check it aint the cartridge, try with another one, or look behind the drum sheild on its base and inspect drum for damage...

This I doubt, the fuser has a mark/scratch on it, and the coating is torn..possible outside chance that its drum but that dont cause creasing, only fuser does, maybe you have both problems

If you take a look at the fuser with a torch, thats the hot bit where paper comes out.... you will see the upper pressure rollers coating is worn and tearing, Fuser wear out on all laser printers cost of fuser itself would be approx Aus$250, no simple fix for you I'm sorry....these were a good unit but I wouldn't fix it, I find that normally this is a sign that time has come for this unit, fix this and in 6months you'll be fixin something else on it, I know, it doesn't get used much, but 2 or 3 years in office equipment these days is good, four is exceptional, welcome to our modern world design to break....

hope this helps



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2 Answers

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To run the cleaning page manually
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2.Press check mark(SELECT button) or the MENU button to open the menus.

3.Use (UP ARROW button) or (DOWN ARROW button) to scroll to CONFIGURE DEVICE, and then press

4.Use or to scroll to PRINT QUALITY, and then press the check button

5.Use (UP ARROW button) or (DOWN ARROW button) to scroll to CREATE CLEANING PAGE for the(LJ 4200/4300) or PROCESS CLEANING PAGE if you printer is a(LJ 4250/4350) then press the check mark

6.Follow the instructions on the cleaning page to complete the cleaning process (LJ 4200/4300

7.If a duplexer is installed, close the rear output bin.

This should help clear some of the flaking toner, if not you might have to replace the fuser unit.

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As you mentioned that the printer makes loud grinding noise or squeaking when page comes out than i feel this is the noise coming out due to faulty fuser.
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If there opening the rear bin noise goes off than top output rollers are faulty.

Thanks and Regards
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ACC C8057A 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 110V, LJ 4100 LJ 4100 Series ACC C8057-67901 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 110V, LJ 4100 LJ 4100 Series ACC C8058A 4100-mk-c4110a-mini.jpg Maintenance Kit, Fuser, 220V, LJ 4100 LJ 4100 Series
Selected Item RG5-5069-000 See RG5-5069-090 Not Available 0
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