Taskalfa 406ci Colored Spots?

[comdoc]

Hi all,

I'm a bit stumped on this issue and am hesitant to over order on parts, especially with shipping delays and the costs associated with what I suspect the solution to be.

I actually have two of these 406ci's with the same issue.

Both are heavily used on color but are under 200K clicks with 300K maintenance intervals.

I was initially thinking dev issue but hesistant since that would probably mean all three developer units are bad which sounds unlikely. Since it's happening on all three color drums, it makes me thing transfer unit. But then again, it doesn't happen with the black drum.

Any assistance appreciated. Images attached.

[tmaged]

Re: Taskalfa 406ci Colored Spots?

Feel the main charge rollers, they probably have bumps and need replaced.
There's a repetitive defects guide that will tell you what it is by measuring the reoccurance.

[comdoc]

Re: Taskalfa 406ci Colored Spots?

Feel the main charge rollers, they probably have bumps and need replaced.

Hey, thanks for the reply.

Can confirm no bumps on the main charge rollers. Could a single main charge roller cause this issue for all of the colors?

Additionally...
It's weird, the other day I was working on a different machine and was getting yellow dots (yellow drum issue) on the full dot pattern for cyan.

In theory, shouldn't this be impossible given only the charge roller in image transfer unit for cyan should be firing for a pure cyan print?

It defied all I had learned working for Ricoh. Does Kyocera do this differently?

[tmaged]

Re: Taskalfa 406ci Colored Spots?

Hey, thanks for the reply.

Can confirm no bumps on the main charge rollers. Could a single main charge roller cause this issue for all of the colors?

Additionally...
It's weird, the other day I was working on a different machine and was getting yellow dots (yellow drum issue) on the full dot pattern for cyan.

In theory, shouldn't this be impossible given only the charge roller in image transfer unit for cyan should be firing for a pure cyan print?

It defied all I had learned working for Ricoh. Does Kyocera do this differently?

It's definitely the charge rollers. You'll need C M & Y charge rollers. Swap one with the black and it will disappear.
On the other issue, even though the cyan was the only color, the primary belt is in contact with all color drums when doing color. That's why you may get the yellow marks.

[BillyCarpenter]

Re: Taskalfa 406ci Colored Spots?

Agree with tmaged. Change the charge rollers.

[comdoc]

Re: Taskalfa 406ci Colored Spots?

It's definitely the charge rollers. You'll need C M & Y charge rollers. Swap one with the black and it will disappear.
On the other issue, even though the cyan was the only color, the primary belt is in contact with all color drums when doing color. That's why you may get the yellow marks.

Okay, thanks. I will go ahead and replace those then. Surprised all three are dead at such a low print count.

In regard to the other thing..

Yes, the primary belt is in contact with all of the color drums but isn't there a charge roller above each drum in the transfer unit that fires so the toner hops off of the drum onto the belt? Why would all four of those charge rollers be firing for a single color? Or at least, wouldn't it make more sense for one to fire at a time when needed instead of having a constant charge on all four?

I guess it works as it's a function of timing the drum rotations/laser write to layer the colors but still

[tmaged]

Re: Taskalfa 406ci Colored Spots?

It's not use that causes it. There are rust spots that form on the metal under the roller. The high voltage arcs through that area causing the spots.
The rollers have since been updated with a nickel coating on the metal to prevent the rust spots.

[comdoc]

Re: Taskalfa 406ci Colored Spots?

It's not use that causes it. There are rust spots that form on the metal under the roller. The high voltage arcs through that area causing the spots.
The rollers have since been updated with a nickel coating on the metal to prevent the rust spots.

Thanks, I appreciate. Also have an 408ci doing some crazy stuff. This was when running a sample set on 089. Ever see anything like this before?

[blackcat4866]

Re: Taskalfa 406ci Colored Spots?

You've got a developing unit arcing to it's drum, that's shutting down the HVT for short periods of time. When the HVT shuts down you get a band of each color. The arcing is usually caused by the developer spacer rollers cracking or wobbling. Now the hard part: how do you tell which drum is arcing to it's developing unit?

Based on the image you've posted I'd start with the cyan drum and developing unit (as a set). You can see the inconsistency of the fill of the band. And No, changing the developing unit only leaves the arc marks on the associated drum. =^..^=

[tmaged]

Re: Taskalfa 406ci Colored Spots?

Blackcat will never steer you wrong !

[comdoc]

Re: Taskalfa 406ci Colored Spots?

You've got a developing unit arcing to it's drum, that's shutting down the HVT for short periods of time. When the HVT shuts down you get a band of each color. The arcing is usually caused by the developer spacer rollers cracking or wobbling. Now the hard part: how do you tell which drum is arcing to it's developing unit?

Based on the image you've posted I'd start with the cyan drum and developing unit (as a set). You can see the inconsistency of the fill of the band. And No, changing the developing unit only leaves the arc marks on the associated drum. =^..^=

Wow, thanks a ton! Do you know of any resources where I can learn about these specific cases? Or simply through experience?

Unfortunately, the service manuals are more generally focused and don't cover this, at least not with any meaningful amount of detail. I'd like to fill the theory knowledge gap in this area.

[blackcat4866]

Re: Taskalfa 406ci Colored Spots?

You're doing it right now:

Ask questions, posted with lots of details.
Read threads on models that you see frequently.

You'll never see that sort of information in a manual.
And if you find a way to reference Kyoceras bulletins and QA's I want to know about it. There is no index, no list, no useful search engine. I get the feeling that Kyocera is intentionally hiding the bulletins.
=^..^=

[comdoc]

Re: Taskalfa 406ci Colored Spots?

You're doing it right now:

Ask questions, posted with lots of details.
Read threads on models that you see frequently.

You'll never see that sort of information in a manual.
And if you find a way to reference Kyoceras bulletins and QA's I want to know about it. There is no index, no list, no useful search engine. I get the feeling that Kyocera is intentionally hiding the bulletins.
=^..^=

Kyocera drives me nuts with KDS. No API either...very limited vendor integration functionality. Someone should tell them about open architecture lol.

The parts numbering and compatibility is pretty overwhelming and ridiculous as well, especially on the accessibility front.

[BillyCarpenter]

Re: Taskalfa 406ci Colored Spots?

! Do you know of any resources where I can learn about these specific cases? Or simply through experience?

I'd suggest hanging out at this forum if you want to learn. Many members on here went to great length to explain things to me after I had been out of the business for years. Just bug the shit out of of them like I did.

[tmaged]

Re: Taskalfa 406ci Colored Spots?

The new site is supposed to be live in April. Astea is not user friendly at all.
The service Navi was a good idea, but hasn't been updated in a few years.
Real world problems are best helped by field techs. We see these every day and know what the common and rare problems are.
If you're a dealer, I can tell you that their area service guys in the midwest region are all very good resources.