C224e/C284e/C364e/C454e/C545e cyan dev unit problems

[hotfuser]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Guess what ?

i have had another 3 cyan dev units fail this week.

All failing once again between 60k-90k colour.

The one i have had this morning is a C284e which has been in the customer for nearly two years without a problem (maybe the odd jamming issue or a worn black drum unit) then out of the blue (no pun intended) the cyan dev unit has failed.

Will be going back to take it back to factory settings after replacing the unit.

Will keep you all informed.

[EarthKmTech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Have you had any initialised machines re-fail since doing so ?

[EarthKmTech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

One thing I have noticed on the c454/554 machines with the toner filter is that the filter is almost always blue when ready to be changed.

I think these machines may just be a modern C352 where regular (IU) failure in certain environments is just to be expected and dealt with. At least it will keep us employed...

[hotfuser]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Have you had any initialised machines re-fail since doing so ?

None as yet have failed since factory re-setting and re-firmwaring.

I will let you know whether this does happen

[hotfuser]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Another failure this morning. Copier had been in customers 14 months and its first breakdown call was this morning for PCQ and yes the cyan dev unit failed.

The copier has done 61k colour and 197k black.

oh well that is another to add to the ever increasing pile.

[copier tech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Failure of Image Unit or Developer Unit.pdf

Not sure if you guys have seen this TAD from March this year regarding dev loss?

[hotfuser]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

[ATTACH]29658[/ATTACH]

Not sure if you guys have seen this TAD from March this year regarding dev loss?

Yes had that bulletin thank you. That basically is for machines that have done over life all of my machines are no where near life on their parts.

[EarthKmTech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

very interesting document none the less.

[chinxxx]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Thanks, in advance, for any info.







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[Tech Helpdesk]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

I have to ask what are Konica-Minolta UK doing about this ? Probably nothing as usual.
Is it specification or a fault lol ??
Seriously there has to be a connection issue and a bias drop out, it just needs to be found.
I will do some digging and see what I can find.

Regards

[nicabocca]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Hi all, what is your TCR-C % ???????? TCR Level History. I have just had the same issue, I have replaced the following: Print Head, FREYB, PRCB, Dev unit, Drum unit, Toner, inspected and cleaned hopper etc.

Reason why I ask for the TCR-C is mine goes down to 0.91% pretty quick, I can manually add tonerand bring it back up to 6.#%, but all our prints are coming out with cyan over everything, except Black only prints/copies. Besides the Vdc-C being 800 and Vg-C 922, everything seems ok.

[EarthKmTech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

mine was / is staying stable at 6.xx%

I was there again today and checked it, 20 something thousand colour pages printed now and still OK - Though I see cyan dusting at the rear of the second transfer roller - FFS!...

Today it ran the K toner hopper dry and the toner bottle was empty and coded out with 2557. The toner level sensor in the hopper is FUNCTIONAL too! WTF.

Perhaps it was the act of resetting the machine that made it assume there was more toner available than there was.

installed new toner bottle, manual toner add developer K twice to bring back to 6.xx% from 0%. Not ideal I know but Ive done this plenty of times in the past without issue.

I have ordered the sub hopper assembly and will replace it if it returns.

[nicabocca]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Within a few colour prints it starts dropping back down. Once it gets under 1% then the C255# error comes up for cyan. Open and close the front door and it resets the code and adds some toner, then I can manually add toner, then all the pages come out covered even worse in cyan for a while. Had this issue before, but was normally fixed with a new dev unit, on a couple machines was the Print control board. Got me stumped this time.

[EarthKmTech]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

if its solid edge to edge on the sheet i would be trying a HV board and checking the condition of the HV contacts at the back of the machine.

[nicabocca]

Re: C224e/C284e/C364e/C454e/C545e cyan dev unit problems

Its shading within the entire print area of the page covering everthing. Even when I do the gradation test prints from the service mode for each colour they all come covered in cyan over the top of Y/M/C prints, but not the black only.