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Thread: Image "repeat"

  1. #1
    Field Supervisor 500+ Posts kingarthur's Avatar
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    Image "repeat"

    Hi

    We've got a C750i Accurio, which they are doing heavy solids. The "white" image, is being repeated. We're using all genuine KM consumables, C count is 50K, K count is 44K. I've turned HR temperature up and down, I've turned off "Smart Fusing Control". Because it's a print from the PC, I can't print in single colours, apart from grayscale. I've printed in grayscale, it's not as bad. would've liked to have printed it in Magenta, Yellow and Cyan. I've now got this image on my USB, and have tried it in several machines, and it does it on every single one.

    Hopefully I've managed to attach the image.
    Attached Images Attached Images
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  2. #2
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    Image "repeat"

    tulintron's Avatar
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    Re: Image "repeat"

    It could say the size of the sheet or the distance at which the image is repeated. It would help a lot.


    But, analyzing the image, I would shoot in drum unit.
    Nothing like day after day

  3. #3
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Image "repeat"

    Anytime I hear image/fault repeat the following question pops up - what's the distance?
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

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  4. #4
    Master Of The Obvious 10,000+ Posts
    Image "repeat"

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    Re: Image "repeat"

    I would make a wild ass guess that that is a drum interval: ~96mm". I would suspect poor charge cleaning on one of the drums. Maybe poor drum ground.

    It would be informative to make digital samples in Yellow, Magenta, Cyan, and Black Only. If you narrow it down to a specific color CMY, you can swap around drums to narrow down which one is the cause. Is it 96mm? =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  5. #5
    Field Supervisor 500+ Posts kingarthur's Avatar
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    Re: Image "repeat"

    Quote Originally Posted by blackcat4866 View Post
    I would make a wild ass guess that that is a drum interval: ~96mm". I would suspect poor charge cleaning on one of the drums. Maybe poor drum ground.

    It would be informative to make digital samples in Yellow, Magenta, Cyan, and Black Only. If you narrow it down to a specific color CMY, you can swap around drums to narrow down which one is the cause. Is it 96mm? =^..^=

    Yep 96mm. unfortunately, I can't pin it down to a specific colour, it's a print file, and my only options for printing are "Autocolour", "Greyscale" or "2 colour". I've put it onto my USB, and again, only have options of "Autocolour" or "Greyscale".
    my 1st thought was drum, then fuser, as I had no way of eliminating the drums, I thought I'd have a go at the fuser adjustments anyway. This seems to be a recurring problem on Bizhubs, even on new machines, it would appear that they can't clean/discharge the drum quick enough, when you have heavy solids and a white script
    Tip for the day; Treat every problem as your dog would.....If you cant eat it or f*ck it....then p*ss on it & walk away...

  6. #6
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    Image "repeat"

    raplma's Avatar
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    Re: Image "repeat"

    Looking at this from a printers perspective rather than a pro tech perspective... so could be barking up the wrong tree here...

    I assume in the image shown it was printed left to right (SEF), and I am not commenting on the quality of the solid colour, simply a thought on the ghosting, which in my mind is due in part to the logo being white on a deep solid colour, and the machines not being able to deal with this sharp contrast in their current condition. In effect the toner from the white patch is being deposited second rotation round.

    Seeing you mention that it does it on every machine you have tried it on, what I would try is rotating the image 180 degrees, so that the logo apsect is printed last. Either rotate the artwork, or you may have an option to rotate image depending on how you send the file to the printer. That may get the file printed without the repeat, while the quality issue gets sorted by a tech.

    Another trick I have tried in the cases of some halftone printing that has drum related artefacts, is although the image is simplex, run the job duplex, so send the artwork through as two pages one being blank. You then print the job duplex, with either the first page being the image or the second page being the image, the non-printing pass gives the machine time to balance before the next image. Don't ask me why this can work but it does sometimes, this is just one of the many "tricks" you pick up from 20 years of being a printer.

    Just a thought...

  7. #7
    Service Manager 1,000+ Posts Gift's Avatar
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    Re: Image "repeat"

    +1 for the drum unit, probably a limitation since it's produceable on other units - seems a little more charge remains on the unused drum surface after the erasing phase. Changing the image rotation is a good tip or try and use and set up a thicker paper type (= lowering the process speed). I'm surprised that none of my customers called this in yet (probable tomorrow because now I conjured it up lol).

    Does it also happen on the lower speed i-series models? From my understanding the C650i/750i ist just a highly bred office engine since KM decided against further developing the C754e/C758/C759 branch.

  8. #8
    Senior Tech 100+ Posts Drivee's Avatar
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    Re: Image "repeat"

    Hi, that is called ghosting. All printers have that, some of them less and some more. OPC unit cause this, this is very difficult job for every printer.
    Try to print this page on any printer and yyou will se... G letter on different gray scale. Use A4 pritner. If anyone need A3, I will provide.


    GhostPagePortraitBlk.pdf

  9. #9
    Master Of The Obvious 10,000+ Posts
    Image "repeat"

    blackcat4866's Avatar
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    Re: Image "repeat"

    Quote Originally Posted by raplma View Post
    Looking at this from a printers perspective rather than a pro tech perspective... so could be barking up the wrong tree here...

    Seeing you mention that it does it on every machine you have tried it on, what I would try is rotating the image 180 degrees, so that the logo aspect is printed last. Either rotate the artwork, or you may have an option to rotate image depending on how you send the file to the printer. That may get the file printed without the repeat, while the quality issue gets sorted by a tech.

    Another trick I have tried in the cases of some halftone printing that has drum related artifacts, is although the image is simplex, run the job duplex, so send the artwork through as two pages one being blank. You then print the job duplex, with either the first page being the image or the second page being the image, the non-printing pass gives the machine time to balance before the next image. Don't ask me why this can work but it does sometimes, this is just one of the many "tricks" you pick up from 20 years of being a printer.

    Just a thought...
    Both sound like great workarounds! Unfortunately the typical MFP enduser cannot understand that machines have limitations, and may not be able to make a perfect reproduction of every possible image. Take for example, using neon RGB colors in the electronic original, then attempting to print them on a CMYK printer. We often hear: "... just fix it!", when the task is outside the capabilities of the device.

    I do like to hear from printers on these topics. They bring a different perspective, and usually do understand that all things may not be possible.

    Quote Originally Posted by Gift View Post
    +1 for the drum unit, probably a limitation since it's produceable on other units - seems a little more charge remains on the unused drum surface after the erasing phase. Changing the image rotation is a good tip or try and use and set up a thicker paper type (= lowering the process speed). I'm surprised that none of my customers called this in yet (probable tomorrow because now I conjured it up lol).

    Does it also happen on the lower speed i-series models? From my understanding the C650i/750i ist just a highly bred office engine since KM decided against further developing the C754e/C758/C759 branch.
    I like the idea of using Thick media type to slow the drum rotation ... perhaps allowing more time for the drum to discharge. I haven't seen this issue either ... but most of my machines are the slower speed. I don't have any of the C750i's. =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  10. #10
    Field Supervisor 500+ Posts kingarthur's Avatar
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    Re: Image "repeat"

    I tried setting the paper to Thick 3,to slow it down, it still did it, however, rotating it 180, seems to have solved it, it's happening on all models, fast and slow

    Sorry if I'm seeming a bit "thick" at the mo....and asking stupid questions....been a bad year, re depression etc...now getting divorced because of it....my head is up my arse up a bit, and sometimes finding it difficult to think logically....

    Thank you everyone for your suggestions
    Tip for the day; Treat every problem as your dog would.....If you cant eat it or f*ck it....then p*ss on it & walk away...

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