IMPORTANT: You DONT need to chip IU's!

[mjunkaged]

Had a customer with a similar problem. MY tech. support said it was a High voltage problem, and they were right. After replacing HV unit, NO MORE developer dump/detone. Was also ONLY one color. IT'S VERY IMPORTANT to check your HV contacts FIRST before replacing boards, It could be a 10 second repair, a bent contact!! No lie!

[Desert Rat]

Great thread,
I will be watching this one as I am just starting to service the KMBH line
of copiers.
It sounds to me as this will have to be handled on a customer by customer
bases. Each method has benifits and draw backs.
Mjunkage, Thank you for your posting in this tread. I know the toner/dev
dumping problem has been dicussed on a few other tech boards and
seems comon on the KMBH's. Maybe KMBH will figure it out someday and
we will all benifit.

See Ya

DR

[lucky13]

this should also help extend the life of your IU up to 150% + -

[mitchl]

this should also help extend the life of your IU up to 150% + -

Good stuff I dont know how I managed to miss that on the tech site......... Hmmmmm

[EUTech]

Hey Redime, the files are no longer there.
Can you help me with these files? I really don't want to buy the resetter from peper...

[pepper38_cnd]

EUtech you do not "have to buy a reseter" no one has to buy anything they don't want. What redime is saying is absolutely true and was presented 2 years ago at the Konica Minolta Regional Dealer Service Managers Conference ( at least in Canada it was). Every Dealer should ensure the techs are making these change before putting a machine in the field.
What he doesn't tell you is that if there is a fax kit on the MFP these changes will make absolutely no difference. Also when the replace IU message comes up the Background Compensation stops ( this is on C250/C252/C300/C352) and the most you will get out of an IU after that is about 6 weeks regardless of copies. Even rechipping after that message appears doesn't work, you must rechip before the message in order for the background compensation to continue. So if you want to leave your customers with a change IU message it's up to you, it is not really extending the life but just giving the customer a few weeks of aggravation before poor print quality starts.

[TheOwl]

This is about the 4th time I have read this thread and still find it interesting.

I just want to point one fact that has been missed here with the rechipping and that is that you can rechip IU's without the TCR Adjustment running.

Next time you run up a machine in your work shop, read the IU's and save the files somewhere. Because the machine has been run up, the IU's aren't new anymore. Put those IU's into another machine and there is no TCR adjusment because the IU's aren't new, therefore the files that were read from the chips "aren't new".

[pepper38_cnd]

Thank you Owl! There are alot of creative ways to avoid F8, ATDC, LDedect or whatever you want to refer to it as. I have always avoided these suggestions as what you do with your chip reprogrammer is up to you, and some people take it to the ex-stream and really mess with the chip, so my stance has simply been read a good chip and wright it to a used chip. All of this crap that re-chipping is going to mess up your equipment is just nonsense by those who know nothing of the process, yes they can quote the service guide, but have they sat down with the engineers and actually discussed it ( I think not! )

[fishleg]

I'm a novice to this I work for a very small company who does chip the drums with no care of TCR adjustment can someone please enlighten me on the harm this would do to the machine ? I understand it would run dirty quite quickly because of the old dev but what harm does it do to re-run the dev if its used ?

Sorry proberly like the daftest question in the world but I wanna learn these things as we do chip the drums so much so if theres a way to not do so much harm to the machine then i'm all ears.

[pepper38_cnd]

Basically TRC sets the Starting value for the Toner Carrier Ratio in the image unit. This is performed when a new IU or a new iu chip is installed. If the actual TCR is too close to the upper or lower acceptable limits then you will end up with a Toner density Error for that IU shortly after the Iu request toner. This is why it is very important to do an Auto Toner TCR before rechipping. See the attached for some tips on rechipping, we have had great success following these guidelines.

[fishleg]

So what your saying is that if the tcr is quite low in the IU thats being chipped when you chip it the machine will think its a new drum so it assumes its already at the desired tcr. The start values will all be to pot so when it adds toner after a few hundred copies it will push it over the edge and cause a tcr error ?

[pepper38_cnd]

The problem is usually that if you start too low then at some point it may drop below the lower limit and pop a toner low density error. Think of it as a scale from 0 to 10 ideally TCR may have a set value of 5 and float between 3 and 7 depending on how much toner is being used and added, the lower limit may be 1 and the upper 9. If you chip the IU when the level is at 3 and that becomes the set value, there is no doubt that it will have a good possibility of dropping down to 1 which will prompt an error. These numbers are for example only, but you get the picture.

[fishleg]

Thank you for explaining that does actually make sense .