MP 4500 light gray background

[Rick]

I am getting a light gray background on this unit . I replaced the transfer belt and cleaned up all the shafts inside of it . this did not help. Is this a dev problem or a drum problem ?

[Max]

Re: MP 4500 light gray background

How old is the drum? if over 100k replace it and a new c/r.Most likley it will be mag roller,take it out and clean it with scouring pad or scrunch some A4 and use that untill mag rolle is shiny.

[jonhiker]

Re: MP 4500 light gray background

X2 on cleaning the mag roller. i would say it is time to clean out the dv unit, scrub the mag roller clean, and replace the developer. also, clean the pcu out as well and contemplate replacing the drum, blade, and charge roller, depending on the copy count. 150K is the PM interval, but most of the time, these machines don't make it that far.

[Llama God]

Re: MP 4500 light gray background

Replace the toner motor with one from a 2045, replace the developer with 2045 type and job's a good'un.

And service the machine.

All of this is assuming that you're an engineer, of course.

[teebee1234]

Re: MP 4500 light gray background

Here are 2 bulletins that address the issue. As far as the updated dev sleeve with a coating, I'm not sure how effective that has been. I've resorted to using a brass bristle brush (toothbrush size) to scrub the surface gently (in the direction of the grooves -front to rear), that cleans out the grooves effectively where just scrubbing the surface with scotchbrite or paper leaves them filled in.
I also agree with the others to start fresh with new pcu, charge roller, blade and dev. Pretty much guarantee the prints will look great.

[nmfaxman]

Re: MP 4500 light gray background

My thought is that the polmerized toner is a smaller particle than regular toner.
I am going to try adjusting the doctor blade gap to a tight 0.30 mm.
Any other thoughts on this.

[zed255]

Re: MP 4500 light gray background

I've been using 0.35mm on the MP4000/5000 and related with success, I don't see why tightening the gap should be an issue so long a density remains acceptable. They seem to run cleaner with a slightly narrower gap. Remember everything has its limit...

[Rick]

Re: MP 4500 light gray background

I replaced the mag roller with one from a 2045 and this solved the problem .