OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

[ebulich]

Hi Folks,

We have a client in the middle of the Indian Ocean that has no hope of tech support. They have a 6 month old OKI C9850MFP.
The issue they have is a very poor print quality. The user has changed the yellow and magenta drum units and also added new OEM cartridges. (They only ever use genuine OKI toners). The yellow and magenta print quality is very grainy and very light. I have sent them instructions on cleaning the LED (but because in the instruction there was a picture of only one LED i am afraid that they may have only cleaned the far left LED shown in the photo and not all four).

BUT does anyone have any other recommendations on what to check on the machine. Its hard to get them to diagnose the components such as voltage to the drum units, so if anyone has had any experiences of this type or error on the OKI's which we have found to be almost bullet proof i would appreciate any suggestions.

The machine is not reporting any user intervention required and i am trying to get them to send me a diagnostics page.

I know there is not much information to go on from what i have typed - but you can see the dilemma that i am in.

Thank you ever so much.

[Eric1968]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

You can instruct them to remove all supplies (drum/toner, transfer belt), and have them carefully clean all contacts. This sounds like a bad contact somewhere.

[JustManuals]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

This Service Manual can now be purchased for $12.77 and downloaded immediately after payment from

Just Manuals ~ The Internet's largest selection of manuals ~ Instant Downloads

Paul@justmanuals.com

[dickierock]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

Hi,I would first get them to print a full colour cmyk or similar chart if you have one to gauge properly the problem.Post the result here if possible.
If you wish I can send you a pdf of a cmyk chart,just pm me.
Also,is it possible you could get the customer to switch one of the bad colours led's to a good one, i.e. switch the yellow led with the black one,magenta with cyan.
They are not too difficult to switch if someone is even a little bit technical.I wouldn't normally recommend this but you seem to suggest they are extremely remote and since they are so far away it will help you diagnose your problem faster.

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

Hi,I would first get them to print a full colour cmyk or similar chart if you have one to gauge properly the problem.Post the result here if possible.
If you wish I can send you a pdf of a cmyk chart,just pm me.
Also,is it possible you could get the customer to switch one of the bad colours led's to a good one, i.e. switch the yellow led with the black one,magenta with cyan.
They are not too difficult to switch if someone is even a little bit technical.I wouldn't normally recommend this but you seem to suggest they are extremely remote and since they are so far away it will help you diagnose your problem faster.

Thank you so much for your response.

I have attached a copy of the pdf of the printed colour charts. It seems that magenta and yellow are the issue. Whether its the LED's or the drum units its really hard to diagnose without being next to the machine. But the user did say they replaced the drum units to see if it was the problem, but the problem still persists after changing the drum units.

Again any assistance is greatly appreciated.

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

An update, the client has cleaned the toner density sensor, but the same problem still persists. My next bet is the Transfer belt.

Does anyone have any other solutions.

[Eric1968]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

I think there is lot more wrong here than drums. If I look at the charts you can see that there's CMYK everywhere. So the machine can print those colors. I think you can rule out the transfer belt, because there's toner transfer over the whole page. I'm thinking of the controller or engine board.You can always swap the LED-Heads to see if the problem moves from one color to the other. LED-Heads have a lifetime warranty.In the service mode you can enable Maintenance Menu Print. When this is enabled you get a new option in the List Print menu called ID-Pattern. With this poption you can print 2 pages with all 4 colors.

[blackcat4866]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

Could it be something as simple as poor transfer, as a result of ... moist paper?

IMHO all colors are equally affected. It could be a contact problem, but that would limit the problem to a specific color. Your color registration is way off, but a simple color registration should solve that. What sort of power are they running on? I don't know what the power standards are at the customer site (100v, 120v, 220v), but +/- 10% vac is the minimum standard. +/- 5% is even better. If they're running off a generator or power converter, the power could be very unreliable.

It helps that you attached a very good sample. =^..^=

[Tonerbomb]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

your color charts suggest that this is 1 of those wonderful FIery equiped units. Has your customer tried any kind of calibration??

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

I have asked tem to try and run a calibration manually but they insist that they can't find anything in the menus on calibration. Perhaps it may have something to do with the Fiery controller. But of course not being able to see the machine its so hard to even contemplate of where to go next.

Does anyone know whether the Fiery contoller is actually an inbuilt device on the machine, or is it stand alone like days gone by.

Its like trying to read in the dark

[Tonerbomb]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

The only Fiery's I've seen on H_OKI's are embedded. So the cal would be in the user admin menu of the MFP or through command work station with the ES-1000 or the I-4 densitometor from X-rite. Not your typical end user....

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

Does anyone know if you can do a colour calibration from the printers menu. I don't have a machine in front of me to talk the client through, but they assure me that they can't find anything relating to colour calibration in the menu system.

Any guidance greatlfully accpeted.

[Eric1968]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

In the menu (on the printer) is an option called Calibration. In that menu you'll find density adjustment, registration adjustment and a few other colour settings. You have to select these options on the control panel of the printer, NOT the scanner.

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

In the menu (on the printer) is an option called Calibration. In that menu you'll find density adjustment, registration adjustment and a few other colour settings. You have to select these options on the control panel of the printer, NOT the scanner.

Good God, thank you for that. I didn't even think that they may have not been looking at the printer menu. Talk about missing the obvious. I'll bet that the user was trying to use the menu on the scanner unit, and i thought that i was going mad.

Thank you once again for your response i shall call them first thing in the morning. I can't believe i overlooked your suggestion.

This board and the people on it are a great asset.

[ebulich]

Re: OKI 9850MFP Yellow and Magents not printing clearly with new drums and toner.

Well the bad news is the user assures me that the printer control panel not the MFC panel is where they tried to calibrate it from. So does anyone else have any suggestions.

Thank you