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

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Gear that drives the fuser unit

Hi there!
this all started with paper jams and grinding noises. i have opened up the printer and found the problem wich was fuser unir gear was smashed so i have chaned the fuser unit with the new one but i did not see the gear that drives the fuser unit the one that joins with the fuser unit gear was dameged ... my question is is it possible to replace that too if soo is there a special name for that gear?

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Re: gear that drives the fuser unit

Ditto. This is probably a job for an authorized service tech.

I replaced a similar gear and screwed up the duplexer. The printer work fine except that it no longer duplexes. (8840D)

If you don't get everything back in perfectly, you'll spend a lot of time messing around with it trying to fix it. And, you risk making your printer inoperable.

Posted on Feb 16, 2008

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Re: gear that drives the fuser unit

Yes one can replace it but it aint no easy job, entire frame needs to come apart, I always change the whole L frame, but gear is available, set aside half a day, take pics or purchase the service manual, it still takes me 40 mins to change a frame on one of these, and you will need to go that far then some to get to just the gear in frame..
7deadab.jpg Link to part number/price/purchase of fuser drive gear

Not such a easy job, you have been warned from one who knows OK

Good luck

Posted on Jan 09, 2008

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Hp 4345 has error code 13.20.00 paper jam in tray 2 and also has a grinding noise by the fuser how can i fix it

The printer may need a "swing plate" replaced to solve the fuser noise. Remove the fuser and look at the black gear inside the printer on the left side. Do the teeth on that gear look worn ? If so that gear (swing plate) needs to be replaced. Its a hard job to do. Can you turn the fuser gears with it out of the machine without them skipping ? The tray 2 jam may just be worn rollers in tray 2 or a stuck sensor. Good luck !

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My Laserjet 5SI printer has been jamming a lot lately and now it's making a grinding noise. Should I replace the cartridge or what?

Fusers generally make grinding noises more than cartridges do. If your paper jams are in the fuser area, check the fuser first.

When you open the left side door of the printer, the fuser is installed on a shelf near the top of the cavity. To remove the fuser, grasp the left and right blue fuser release handles and rotate them to the straight up and down (vertical position. Then lift up on the fuser and remove it from the printer.

Take a close look a the at the gear located on the top left corner of the fuser - does it have broken/ bent teet or is it loose on its mounting shaft? If so, that's probably causing both the paper lams and the grinding.

Also look in the printer directly under where this gear would be if the fuser were inserted in the pinter. Do tou see a build-up of fine particles the same color as the fuser gear. If you do that's further proof the the gear is bad.

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Our printer is making a really loud, sort of grinding noise and then it jams. why is it doing this? When we start to use the printer in the morning it also makes the grinding noise when it's warming up.

You need to check a number of areas, but first try to determine where the noise is coming from...

1) First, where is it jamming...If under the cartridge, the cartridge drum may be too tight. If you have another or an old one (even if empty) try switching it out.
2) If the sound is coming from the front, your manual feed rollers (front) or main paper tray pickup rollers or gears (below) may be slipping.
3) If the sound is coming from the rear, check the fuser gears. It will have a main, big gear that meshes with the big drive gear (swing gear) inside the printer. The fuser is the accessed by removing the rear cover. The fuser can be very hot, as its job is to fuse the toner to the paper just before it exits into the bin. Let it cool off, then remove, inspect the gears for wear, re-seat it and test print--listening again to see if the sound is still there or gone.
4) If the sound is coming from the top rollers where the paper exits, check the gears that drive these rollers for wear and/or skipping teeth.

One of these will be the culprit. The hardest part is isolating the source of the sound.

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The screen reads paper jam error, but there is no visible paper jam and when turned on a grinding noise occurs

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Call Xerox for further repair if this is the case. Also behind this gear are many other gears that can cause this same problem. Very involved and time-extensive to repair even for a trained Xerox technition.

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