MX-4071 Squeaky Noise (Video Included)

[danny464]

We are having an issue from a MX-4071 with internal finisher. 3 different technicians have gone but we are unable to replicate the noise on site. Customer says noise comes and goes and it might even go a week without making it.
I used simulations to test the finisher and machine motors but no luck. We are thinking of replacing the whole finisher, if that does not fix it just replace the machine.
Anyone have any insight?

[Sven94]

It's the bearing in the fusing unit of the fusing rear upper transport. I only have the documents for europe ( germany ) DEU-5856_CCE2888.pdf
The bearings are worn out. When you disassemble it, you will see a lot of plastic powder from the bearing.

[Imprestik]

It's the cooling roller which is the silver shaft on the exit of the fuser. The cooling roller is held in by 2 bushings which are full of debris. Clean all the debris out of the bushings and add a very small amount of high temp grease and it will resolve your issue. Had this many times

[danny464]

Thank you both! Will give it a shot.

[bilyahn]

Another place to look is on the exit assembly just before the punch/dummy punch unit. If you take the cover off just below the display panel you will see a metal bracket that acts as a ground on the exit shaft. This will cause noise also. Mine wouldn't happen until they did large jobs (700+) then when they let it rest the noise would go away until the next large job.

Good luck.

Bil

[Andypraeuner]

If oiling the fuser and the exit units doesn't work, take the finisher out and remove the front and rear covers then remove the top transport section 2 and oil the bushings on the shafts inside the finisher transport section 3. Check page 20 of the parts guide for the MXFN27N you'll see which bushings to oil.