[CQ] MP C300 1200x1200 image issue

[sandmanmac]

Replaced the K-PCU on a customer's MP C300 today due to bad image quality. Only afterwards when I printed out the colour pattern did I notice the image problems with colour. The weird thing is that it only shows up when printing 1200x1200 patterns. Colour copies and PC prints are ok.
I've attached samples, and you can see that the 600x600 auto colour calibration page is fine.
Probably something simple, but I've just never seen this type of thing before.
Then guess what? My next stop was to drop off supplies for another MP C300, and I did a check up while on site, printed out the colour pattern and saw the exact same thing!

The only thing that makes any sense to me is the ITB, but that doesn't even really make sense? and why does it only happen on high resolution?

Advice greatly appreciated!

[davel]

Re: MP C300 1200x1200 image issue

Looks like you have a fuser issue to me.

[sandmanmac]

Re: MP C300 1200x1200 image issue

Looks like you have a fuser issue to me.

But how if it only appears in 1200x1200 dpi and ONLY in colour?

I also neglected to mention that both machines have similar usage at only about 60K total and under 20K colour.

Also the repeating image is drum diameter and not as distant as I'd expect from fusing belt. Just asking....

[Kimi]

Re: MP C300 1200x1200 image issue

Did the customer complain about it?

[fshead]

Re: MP C300 1200x1200 image issue

Replaced the K-PCU on a customer's MP C300 today due to bad image quality. Only afterwards when I printed out the colour pattern did I notice the image problems with colour. The weird thing is that it only shows up when printing 1200x1200 patterns. Colour copies and PC prints are ok.
I've attached samples, and you can see that the 600x600 auto colour calibration page is fine.
Probably something simple, but I've just never seen this type of thing before.
Then guess what? My next stop was to drop off supplies for another MP C300, and I did a check up while on site, printed out the colour pattern and saw the exact same thing!

The only thing that makes any sense to me is the ITB, but that doesn't even really make sense? and why does it only happen on high resolution?

Advice greatly appreciated!

it looks undertoned and you are getting a very light double image

[Athlontini]

Re: MP C300 1200x1200 image issue

I'd guess it's color PCUs or dev units. You mentioned you replaced the black PCU, and on the example sheet, black is the only one not making the repeat image.

Also, I happened to see this same thing on an MPC300 earlier this week, but it was only K that was doing it, and the K PCU was waaaayyy past yield.

[LNorris]

Re: MP C300 1200x1200 image issue

if you are referring to the "ghosting" of the text. i just fought that. we replaced the K drum unit and all is well

we had taken the drum unit to another machine and issue followed

[sandmanmac]

Re: MP C300 1200x1200 image issue

Also, I happened to see this same thing on an MPC300 earlier this week, but it was only K that was doing it, and the K PCU was waaaayyy past yield.

if you are referring to the "ghosting" of the text. i just fought that. we replaced the K drum unit and all is well

we had taken the drum unit to another machine and issue followed

I agree that it looks like a pcu issue, but all 3 at once with low usage, doing the exact same thing, In 2 separate locations? This is what I can't wrap my head around.


And when you say that you've had this issue, do you mean the same as mine where it only happens when printing 1200x1200? Because, as I said, regular day to day printing, copying is unaffected.

Is it Possible that the speed being slower when printing 1200x1200 could somehow affect the image?

To answer the question of "did the customer complain?" No.....not yet, but that's not exactly the point here. I'm not the type to just bury my head in the sand and hope a problem goes away.

I suppose I'll just drop in there sometime next week with a bunch of known working consumables when I have some time, and swap some stuff around to see what resolves it.

[slimslob]

Re: MP C300 1200x1200 image issue

I agree that it looks like a pcu issue, but all 3 at once with low usage, doing the exact same thing, In 2 separate locations? This is what I can't wrap my head around.


And when you say that you've had this issue, do you mean the same as mine where it only happens when printing 1200x1200? Because, as I said, regular day to day printing, copying is unaffected.

Is it Possible that the speed being slower when printing 1200x1200 could somehow affect the image?

To answer the question of "did the customer complain?" No.....not yet, but that's not exactly the point here. I'm not the type to just bury my head in the sand and hope a problem goes away.

I suppose I'll just drop in there sometime next week with a bunch of known working consumables when I have some time, and swap some stuff around to see what resolves it.

Sandy, one question. Did you run all modes of Auto Color Calibration in User Tools - Maintenance? Starting with the CXX03s, certain firmware can erase the settings from the last time it was done.

[sandmanmac]

Re: MP C300 1200x1200 image issue

Sandy, one question. Did you run all modes of Auto Color Calibration in User Tools - Maintenance? Starting with the CXX03s, certain firmware can erase the settings from the last time it was done.

Yes, I did Tim, that's sort of how I determined the issue was limited to the highest resolution.

[mikadonovan]

Re: MP C300 1200x1200 image issue

Give the ID sensors a cleaning and try it again, it seems to help off-color issues.

[sandmanmac]

Re: MP C300 1200x1200 image issue

Give the ID sensors a cleaning and try it again, it seems to help off-color issues.

I appreciate the input Mika, But I did clean them at the time hoping it might help

[CopyBats]

Re: MP C300 1200x1200 image issue

Replaced the K-PCU on a customer's MP C300 today due to bad image quality. Only afterwards when I printed out the colour pattern did I notice the image problems with colour. The weird thing is that it only shows up when printing 1200x1200 patterns. Colour copies and PC prints are ok.
I've attached samples, and you can see that the 600x600 auto colour calibration page is fine.
Probably something simple, but I've just never seen this type of thing before.
Then guess what? My next stop was to drop off supplies for another MP C300, and I did a check up while on site, printed out the colour pattern and saw the exact same thing!

The only thing that makes any sense to me is the ITB, but that doesn't even really make sense? and why does it only happen on high resolution?

Advice greatly appreciated!

Maybe a silly question but

Have you tried completing the colour calibration with the 1200 resolution to see if the machine reads it and adjusts accordingly?

[sandmanmac]

Re: MP C300 1200x1200 image issue

Maybe a silly question but

Have you tried completing the colour calibration with the 1200 resolution to see if the machine reads it and adjusts accordingly?

Not a silly question at all, but I can't honestly remember.
I feel like I must have scanned it when asked, but I also feel like it should have failed.

[CopyBats]

Re: MP C300 1200x1200 image issue

Have you taken a look at this ?