[CQ] Kyocera FS-C5350DN - No magenta on prints

[Anonym0us]

Hi everyone

I seem to be coming across a problem with the C5350, where it is not putting any magenta onto printouts. Only appears to happen with magenta. There doesn't seem to be enough or any toner getting down into the dev unit. We have checked the toner, it is opening correctly, the toner drive is working. The worm drive that feeds the toner in the transfer belt is functioning and the dev unit agitator spring is also functioning correctly. Even stranger is on every instance when the machine has been lifted (either to a more accessible area or back to the workshop) it then starts to print out perfectly again. But this wont last.

The latest firmware is installed. Is there some other process i could be missing?

Thanks for any help.

[blackcat4866]

Re: Kyocera FS-C5350DN - No magenta on prints

Have you done any of the Gemini updates? =^..^=

[JustManuals]

Re: Kyocera FS-C5350DN - No magenta on prints

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[Anonym0us]

Re: Kyocera FS-C5350DN - No magenta on prints

Have you done any of the Gemini updates? =^..^=

Possibly not Blackcat, i dont know what updates you are referring to! I double checked through all the service bulletins, don't see anything.

[HenryT2]

Re: Kyocera FS-C5350DN - No magenta on prints

Even stranger is on every instance when the machine has been lifted (either to a more accessible area or back to the workshop) it then starts to print out perfectly again. But this wont last.

Thanks for any help.

There was a bulletin ( B157-2KV-0002 May 2011) on the bias springs that may help you . ( I thought of this when you said that if the printer is moved, it will work for a while )
I also heard somewhere ( maybe here on CTN ) about the bias tabs on the transfer unit not making good contact, even after re-seating.
Does your customer move this printer around ?

[Anonym0us]

Re: Kyocera FS-C5350DN - No magenta on prints

There was a bulletin ( B157-2KV-0002 May 2011) on the bias springs that may help you.

Thanks for the reply HenryT2. Cant find that bulletin in serviceworld or anything regarding bias springs! Are you sure we are talking about the same model? FS-C5350dn

I'll check anyway. Customer doesn't move the machine about (that i know of). Strange that a few machines have had exactly the same fault. Give them a boot and they will work for a while.

[blackcat4866]

Re: Kyocera FS-C5350DN - No magenta on prints

The relatives that we have in the field are the FS-C2526MFP, but it's the same print engine. When this first started happening, I'd take out all the units, poke around a little, then put it all together, then the copy quality would return. My guess is that re-seating the imaging units restored the bias connections, but that's only a guess. =^..^=

[Anonym0us]

Re: Kyocera FS-C5350DN - No magenta on prints

Just an update. One machine in particular was "fixed" and returned to the field, its done about 4000 prints and has dropped the magenta again.

They are printing quite a low coverage and the T7 Toner management was enabled through prescribe to try to stop overtoning.

Just wondering if anyone else has any experience with the T7 toner management and could it be causing severe undertoning leading to missing colours?

Thanks!

[blackcat4866]

Re: Kyocera FS-C5350DN - No magenta on prints

Just an update. One machine in particular was "fixed" and returned to the field, its done about 4000 prints and has dropped the magenta again.

They are printing quite a low coverage and the T7 Toner management was enabled through prescribe to try to stop overtoning.

Just wondering if anyone else has any experience with the T7 toner management and could it be causing severe undertoning leading to missing colours?

Thanks!

Overtoning has not been the issue for us. It's undertoning. And no, I haven't used the T7 toner management setting. Is that what your "fix" is? =^..^=

[Anonym0us]

Re: Kyocera FS-C5350DN - No magenta on prints

Hi blackcat

The T7 was a cure to a terrible overtoning problem we were having. The customer was printing everything in eco mode, and we believe this lead to overtoning and dropping toner (mostly on black) due to excess toner in the dev unit. The T7 appeared to fix this issue by adjusting the toner going into the dev unit (i think it dumped toner into the waste toner). However we are now seeing quite a few cases where machines are missing the magenta on prints as described previously; to which we have no solution. We are running several machines on full colour mode in the hope that it stops this problem.

[Kyo fan]

Re: Kyocera FS-C5350DN - No magenta on prints

Hi everyone, first time posting here.

Having the same issues on these printers (especially FS-C5200DN and FS-C5300DN models). Have lots of these on the field and it's not just magenta. Happens on cyan and yellow too, and sometimes even 2 colors are missing at the time. What i noticed is that this starts to happen after about 2 years of usage, no matter the page counter (some have 30k printouts, and some 180k - same problem). Like blackcat said, pull everything out, peak around, put it back in and all the colors are there. You might get adding toner after u initialize, and after few cycles its fixed. But that lasts for few weeks in my case and just randomly happens again. I have looked everywhere for the solution (btw I have access to all the documentation as dealer) but nobody gives the exact cause of this. I don't really care if i need to replace everything inside, just to make sure it doesn't happen again after few weeks.

It really pissed me off. Cause of this i loved previous models FS-C5015N, FS-C5030N which didn't have these problems, and had superior color quality (they were led printers i know, but still).

[blackcat4866]

Re: Kyocera FS-C5350DN - No magenta on prints

There are a bunch of updates to the Gemini series. The parts cost is probably under $300 but it will take you 6 to 9 hours to complete. There are three extensive bulletins on this series. I also took 8 pages of notes on the update procedure. Sound like fun? It's not. My suggestion is that if you decide to do any of the updates, do them all. It's rather invasive.

My guess is that you're losing developer bias between the spring contacts near the laser, and the spring contacts to the HVT. The specific update to address your problem is to install the case spacers. Essentially the tension on the contact springs collapses the plastic waste toner housing, losing electrical contact. And the case spacers need to be installed such that the top of the "T" is raised all the way up as high as it can go. You'll understand when you get there. =^..^=

[Kyo fan]

Re: Kyocera FS-C5350DN - No magenta on prints

Thank you very much for quick response blackcat.

I've been thru 6-9 hours drill of installing improvement kit (rather cheap, about 15$ for all) for FS-C2126MFP and FS-C5150DN, and i know the pain. So are you saying the similar thing is out for FS-C5200Dn, FS-C5300DN, cause they are somewhat different build. The 4 case spacers you are referring to I've installed in 2126 and 5150 models and it says it's to prevent solid or partial color image leak.

[wseyller]

I just this week has to fix two C5250s with light print due to dev units starving for toner. I found a bulletin for a toner supply issue that requires several modified parts. I had these printers brought in house because the teardown is lengthy. I will say though that for both printers it cured the issue.



Sent from my DROID BIONIC using Tapatalk

[Kyo fan]

Re: Kyocera FS-C5350DN - No magenta on prints

Yes, it's the same improvement kit as for FS-C2026MFP/2126MFP. The problem is that no bulletin or kit exists for FS-C5200DN and FS-C5300DN printers which are having huge issues with print.