2090 dumping toner

[captkirk]

We have a Ricoh 2090.
New developer, drum, and transfer belt.
It looks to be putting to much toner than the machine can use.
if we run 50 sheets some will have marks on them that look like too much toner or a toner splatter mark. Just like toner dropped out and splatted on the paper.
The drum has a lot of toner on it before it hits the blade and looks good after the blade cleans it.
We have turned the toner supply rate down also. Was at 850 now at 1500.
Any ideas?
Thanks

[Shadow1]

Check your ID sensor voltages - I also have had some developer units where the mag rollers begin to demagnetize - causes toner dusting by itself, but also makes weak process control patches and causes the machine to compensate by overtoning...
A bad developer vacuum pump will also cause this, but not immediately after a PM.

[ZeusGT]

Over tone and dusting is a common problem with these machines when being used in a high volume enviorment. I sure you've done this, but in very few cases the filter that is right under the control panel will clog up and cause some major dusting and over tone issues. I've seen cases where there will be a very small hole in the tubes that go into the developer to the pump that will cause these problems as well.

I agree though that the first thing that I would do is check the ID sensor voltages and make sure that they are in spec.

How many copies are on this machine? Last by not least, there could be a problem with the doctrine blade inside of the developer. I would check the specs on that guy as well...

Let us know how it goes.

[Lagonda]

How many copies has this box done? I'd be suspious of the foam seals around the toner delivery roller in the toner hopper unit. Age and humidity can turn them into chewing gum. Detatch the toner hopper from the dev unit and hold it over a sheet of white paper while you turn the delivery roller. If it comes out in a fine sprinkle all is well, if it comes out in large splots you've found the culpret.

[ricohrice]

replace all 6 dev bushings

[Shadow1]

replace all 6 dev bushings

boy are you a glutton for punishment - takes forever, extremely messy, and never works right again. Replace the developer assy - this also fixes the degaussed mag rollers if they are starting to get weak.

[cobiray]

Make sure the mag is clean if you haven't already.

[dakke]

I have same problem as above , somebody any ideas ?already replaced : drum , cl blade , cl brush , developer unit , developer (+7) transfert belt and blade id sensor , potential sensor , toner end sensor toner hopper high voltage board BCU I/O board controller box with other nvram td sensor drum grounding assy After initialize developer , vref ok , after +- 200 prints : vref :1.00 and lowerThe machine is at that moment in overtoning ,Somebody any idea ?thx

[Jimbo1]

Cobiray was on the right path about the mag roller. We were trained on the earlier versions to scrape out the grooves with the drum scrapers in the PM kit that nobody replaces anyway. They said if you didn't clean the developer good at the PM it could start dusting out as early as 50K. They had us cleaning under the doctor blade too and even came out with a little plastic tool for it to keep from having to take the blade up. Never had any problem doing that but someone apparently did.

[claudioterrible]

2090

if you check "and all seems ok",check the toner suction assembly(take a look in the servicew manual) is used to reduce the air pressure inside the development unit,if this assembly works i the wrong way,your machine will be covered by a cloud of toner(all inside)

[Shadow1]

if you check "and all seems ok",check the toner suction assembly(take a look in the servicew manual) is used to reduce the air pressure inside the development unit,if this assembly works i the wrong way,your machine will be covered by a cloud of toner(all inside)

The suction side on the pump is much smaller than the output side - you would have to try really really really hard to mess it up, but the pumps do fail and will cause the machine to dust. It is a PM item (2.4M if I remember correctly) and you should replace the sucked toner collection bottle, toner pump, and hoses as well. (I replace the hoses with vacuum line from an automotive parts store - the Ricoh lines collapse and the inside lining sometimes separates and bubbles - never had to clean one out after I started doing this)

[trc]

[captkirk]

same problem

We want to find out if it would be a good idea to clean out the toner recovery system?
We have noticed that when we start having the toner streaking problem that the drum unit is covered in toner and the filter has to be cleaned.
We replaced the drum,blade,cleaning brush,all the filters.
Also the toner recovery box was replaced about 10 thousand copies ago and has hardly no used toner in it. Leading us to believe that the recovery tubes might be clogged.
Any ideas about this.
Thanks

[Shadow1]

There are 2 waste toner bottles in this machine - the main waste system is under the toner bottles - if this gets plugged up you will know it. The other is for the developer vacuum pump - this is a PM item at 2.4M and is usually less than half full. If the pump fails or lines get clogged the machine will run dirty and have other strange problems.

[captkirk]

fixed

Went back to basic and went with what we thought it might be.
We replaced the corona wire again. We have run 5,000 copies with the marks gone. Must have had a bad wire. We replaced it a couple of weeks ago. It looked to be installed correctly as well.
Go figure???????

Thanks for everyones help.