Mega overtoning issue Mp9002

[CableGuy]

Hi All. First post this year. Hope everyone is well.
I'm having an issue on a MP9002 where it seems to add excessive amounts of toner, eventually dumping toner in the pcu unit and on the page. This usually happens after a PM service. Takes about a month or two to become noticeable. The last time this happened I replaced only the Dev, which has now done 100k+. The drum has done around 270k+, everything else was replace the last time the drum was replaced as well. I did the td sensor reset, 2-801 as usual there are no other setting I know of, other 2-962 which is done when the drum is replaced. Out of desperation today, I fiddled with the Toner supply rate SP 2-209 Default 850. I whacked that sucker up to 1100. Since then I've been getting a SC 204..... I'm going back in tomorrow to reset the TSR back to 850 as I feel that may be causing my new error code.
If you have any advice on how to cure this over toning problem I would be grateful. I know from past models this is an issue, But it seems to crop up once I've done a PM on the machine.
Regards to all

[Counsel]

Re: Mega overtoning issue Mp9002

I believe there is a bulletin on over toning issues. We have some 6002 and 7502s that did this early on around 150k to 200k it would act as if the developer was letting toner fly. Running this bulletin did help with a lot of the over toning issues between PMs I would recommend doing this at the next PM visit as it does say this should be done with a developer replacement. So i would do the bulletin first and reboot then do your PM with developer as normal.rfg063481.pdf

[Tonerbomb]

Re: Mega overtoning issue Mp9002

Follow the bulletin that counsel posted it helps a lot!!!!!! you'll probably find the user is doing a lot of low fill pages, and that leads to the over toning........

[anothertech]

Re: Mega overtoning issue Mp9002

I am going to apply bulletin D131/D132/D133-008 tomorrow, I don't know what to set SP2986-001 to, it is 0 by default and there's no guidance in the bulletin as to what to set it to. It is the interval range for the toner refresh, 1=1k copies and the range is 1 to 25, any thoughts?

[Counsel]

Re: Mega overtoning issue Mp9002

I had a really really low volume one, the customer was printing less then 1000 pages a week on it, so I did set mine to refresh at 1k so that it does it at least once a week. If they are running pretty normal volume you can probably omit that SP and be fine, i think that helps more in the case of light image issues.

The first few I did that had pretty regular volume 15-25k a week I didn't adjust that SP and still saw a vast improvement in the developer life.

[slimslob]

Re: Mega overtoning issue Mp9002

I am going to apply bulletin D131/D132/D133-008 tomorrow, I don't know what to set SP2986-001 to, it is 0 by default and there's no guidance in the bulletin as to what to set it to. It is the interval range for the toner refresh, 1=1k copies and the range is 1 to 25, any thoughts?

With machines with volume and coverage in the normal suggested range, leave at 0 as operation will keep the toner in the developer fresh, otherwise try 10. If the problem comes back at 10 but takes longer, try a lower number. Bear in mind, toner refresh cycle means that the machine cycles on it own and applies toner to an uncharged drum which is then removed by the cleaning blade. You want the highest number that will get you from one PM to the next. Too low a number and you will be pumping toner into the waste toner bottle.

[anothertech]

Re: Mega overtoning issue Mp9002

With machines with volume and coverage in the normal suggested range, leave at 0 as operation will keep the toner in the developer fresh, otherwise try 10. If the problem comes back at 10 but takes longer, try a lower number. Bear in mind, toner refresh cycle means that the machine cycles on it own and applies toner to an uncharged drum which is then removed by the cleaning blade. You want the highest number that will get you from one PM to the next. Too low a number and you will be pumping toner into the waste toner bottle.

This machine has a good amount of volume but very low coverage, it needs to be vacuumed out at about 100K, trying for better than that. I will try it a 10 and take it from there, thanks

[anothertech]

Re: Mega overtoning issue Mp9002

Ok, did the full PM with developer change, cleaned the dev cylinder with a brass brush, applied the settings of bulletin #8, here's something I also did, after changing the developer, I disconnected the toner add motor mounted on the dev unit, then ran 20 sky shots, then connected the motor and ran dev SP2801 (TD Sensor Initial Setting) as normal. My thought was initializing the dev with a little less toner in it, maybe it will run a little cleaner? Any thoughts?

[Counsel]

Re: Mega overtoning issue Mp9002

I guess I would not have done that only because a fresh bag of developer should already have the right mix, i would be afraid running it like that could pull developer out to the image instead of toner, nothing like metal fillings across the drum and fuser. If it worked more power to you but the TSB should resolve most of the future issue I wouldn't make that a habit for other PMs on this machine or another. Just my 2 cents.

[slimslob]

Re: Mega overtoning issue Mp9002

Ok, did the full PM with developer change, cleaned the dev cylinder with a brass brush, applied the settings of bulletin #8, here's something I also did, after changing the developer, I disconnected the toner add motor mounted on the dev unit, then ran 20 sky shots, then connected the motor and ran dev SP2801 (TD Sensor Initial Setting) as normal. My thought was initializing the dev with a little less toner in it, maybe it will run a little cleaner? Any thoughts?

After the next time it does an ID patch it won't make any difference as auto process control will adjust the density according to the density of the patch.

[anothertech]

Re: Mega overtoning issue Mp9002

After the next time it does an ID patch it won't make any difference as auto process control will adjust the density according to the density of the patch.

Yes it will adjust according to the density of the patch, I was trying to set it up so the patch reference was less dense. I think that's what SP2801 (TD Sensor Initial Setting) is doing.

[slimslob]

Re: Mega overtoning issue Mp9002

Yes it will adjust according to the density of the patch, I was trying to set it up so the patch reference was less dense. I think that's what SP2801 (TD Sensor Initial Setting) is doing.

SP 2801 runs the developer motor to evenly distribute the developer and takes readings from the toner density sensor to set as an initial reference. When an ID patch is generated, the result is used to adjust that reference voltage according to the density of the patch. If the patch is too light it will adjust Vref so the machine will add toner to bring the density up. If the density is low, the opposite is done. On some models you can increase or decrease apparent density by adjusting development bias during ID patch generation.