help with Rico Aficio 7500

[shmulon]

the developer is going into the used reservoir after 50,000 copies
why is this so?
any help would be greatly appreciated
all the best and thank you in advance!
-Samuel

[schooltech]

I'm not sure if there is any TSB for the developer or developer unit, but I'm thinking of a few things:

1) dv bias/charge settings are too far out-of-whack (check all sp settings)

2) maybe the dv seal is sort of "flicking" dv off-maybe the seal is bent or warped

3) dv may be bad, or going bad

4) low dv/toner mixture (td sensor is getting flaky)

If dv is getting into the waste-toner section, it will also be around the drum for toner recycling.

Waste toner is always deposited from the transfer unit, so that's a lot of dv getting into the transport area. I am surprised the copies don't look like crap.

Maybe someone else has seen this problem with this box. I only had one of these in my territory before I left the company, so I didn't work on it much at all.

[Scott_Lewis]

the developer is going into the used reservoir after 50,000 copies
why is this so?
any help would be greatly appreciated
all the best and thank you in advance!
-Samuel

"used reservoir" as in the waste toner bottle?

About the only way it could would be if it got there via the drum cleaning system. I would expect there would be lots of developer dumped under the developer as well. Developer dumping can happen several ways..... one of them running the machine with no toner .... do you have the machine set to stop when it is out of toner? Has anyone been messing with the charge and development biases?

[shmulon]

yes i am referring to the waste toner bottle
their is no toner underneath the developer and i replaced the entire housing of the developer as well as the transfer supply unit and the high voltage charge unit
thank you for your answers!!!!!!!
i will continue to work on this machine
any other ideas would be greatly appreciated!!!
-Samuel

[schooltech]

You didn't state if you printed out the SMC report. This report will give you a wealth of info based on whether your box is sick or not, even if you can't see it. If you can, compare all readings with a good box. But, on the report, it will show the default setting and what the current setting is.

It may not be a difficult problem at all; you just want to not over-think the machine too much. Sometimes, these machines make us do stupid things.

Example: I was working on a newer Sharp Arm-620 (which I was still learning) and I replaced the fuser assembly with a brand new one. Everything worked good for a day or so. They called me back to look at why it's jamming. I was there for a few hours, and kept narrowing it down. I finally figured it out-I needed to unscrew the new set screws for the fuser pressure, so it actually HAD pressure!!! It was not as obvious as it sounds though. The copies kept stopping at the weirdest places, but sometimes they'd pass fine. Of course, landscape copies fed fine, along with legal & ledger. Letter portrait was the only one that was having difficulty. But, it initially passed copies, but they were blank so I never checked to see if the toner was rubbing off.
At least the clutches are now all clean. I'm a Ricoh guy and the Sharp's I work on are just weird.

The point I am making is that 1) I've never done that since and 2) It was a simple problem that I overthought.

Just my .02

[trc]

drum contact......(bad) or....the most common....over-used charge corona or drum.....

[Ruggedawg444]

Are you sure the correct developer is in the machine

[petrus]

I am agree to the drum ground contact and drum faulty.

however.its will be better if u seat at coffeshop and have a cup of rich cofee
while think about it.
this is my way when i runs out of idea.

ha ha ha .............


some people just can smile on the problem and its gone.
i dont know.but its true.

[DIONISIS]

check the quenching lamp, if its working(put out corona and see the red light).
the drum is original???

[Lagonda]

MP 7500 or MP C7500? 'cos if its a MP C theres suppose to be dev in the waste toner bottle.........................just a thought.

[Shadow1]

Open Drum ground will very rapidly pull all the developer out... and eat the drum. I've also seen a severely worn drum (the opc had worn completely to bare aluminum in spots along the back edge) short the developer bias and cause this.

[shmulon]

Thanks for your help.

[mikadonovan]

This may not be of any help to you, but I have seen developer ON TOP of the waste toner bottle when the rear bushings fail in the development unit. In this situation misfeeds follow shortly after due to developer that has dropped down into the feed units.