PRESS 1052 line

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  • blackcat4866
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    Re: PRESS 1052 line

    I think we might finally have resolution on this one. My KM rep has been out yesterday and today. The firmware update didn't make any quality difference. The only difference I did notice is that the machine talks to me now. It's not the voices in my head, that's something different.

    Nearly a day into it we got a suggestion to import a data backup from another 1052 to see if we could change the problem. There are 4 parts to the backup. The full backup created a totally different quality problem ... but removed our line. So we restored the original data, and imported only the Paper Tray Settings, which completely resolved the issue. Now there were a number of compensations set in those tray settings: fuser power, humidity, curl, media type, etc. We changed those items back one at a time without bringing back the issue. So somewhere in those tray settings is a specific setting that caused the issue.

    We looked at the backup file in a text editor, and it's completely unreadable. Perhaps it's encrypted. Who knows? But there was no way to directly compare the data between the two Paper Tray Settings backups.

    To throw a little more confusion on the topic we identified some hard to explain features to the line problem:
    *It does not occur on LTR-R paper, regardless of the tray.
    *It occurred on both LGL and LGR 311mm from the trail edge, regardless of the tray.
    *It occurred on LTR 185mm from the trailing edge, regardless of the tray
    *It only occurred after several hundred to several thousand consecutive pages.
    *It occurred primarily on odd numbered sides of duplex. Efforts to fix the problem often caused the line to appear on the even sides also.
    *The image fault is a scattering of toner (not digital in nature), not in any way connected with the content of the image. Areas with no fill at all were just as likely to show the problem.
    *There was a slight halo around text when the line passed through a line of text. There was no blurring or distortion of that text. It was almost as if the charged area of the image was repelling the scattering of toner.

    I hope this can help save someone some trouble. =^..^=

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    Originally posted by allan
    Have you tried to adjust the fuser speed?
    Update: KM sent us some busy work. We were sent a 4 page process called "linearization", aka image adjustments to anybody else. Since I really had nothing better to do I followed them to the letter. The first adjustment seemed to make the most improvement. What was it? Fuser Speed.

    I was getting a very subtle line blur 120mm from the trail, best seen on test pattern #9. The text in the manual is particularly unclear about how the adjustment works. By trial and error I successfully made it much worse before making it better (improvement= -2 clicks). On machine #1 the line and side smudge disappeared completely. On machine #2 the line is very faint at 1000 duplex, and the side smudge fades in and out. That's a big improvement over steadily increasing defect.

    I do not understand the connection ... yet ... but I will. Thanks allan. =^..^=

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  • allan
    replied
    Re: PRESS 1052 line

    Originally posted by blackcat4866
    No. Would that imply the the fuser speed was changing in the middle of a run? =^..^=
    There is a line speed adjustment on the machine, it could be that the paper gets tugged by the fuser or the opposite.

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    No. Would that imply the the fuser speed was changing in the middle of a run? =^..^=

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  • allan
    replied
    Re: PRESS 1052 line

    Have you tried to adjust the fuser speed?

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    Following up:

    We don't know very much for sure. The marks on the edge of the stack 34mm from the leading edge, seem to be somehow related to the alignment of the transfer belt. After much trial and error (mostly error) we found a setting in which the marks on the sides of the paper were not present some of the time. Within a few thousand copies it returned, and could be removed again with a slight tweak to the transfer belt alignment.

    The smudge 32mm from the leading edge on the first side was briefly joined by a matching smudge 40mm from the leading edge of the second side. It went away within a few thousand copies.

    We wasted some time cleaning the duplex section again, and checking fan & filters. KM is saying that these smudges may be caused by the finisher. I have a little problem with this theory. How exactly would that smudge be fused, if it happened after passing through the fuser? Explain that.

    We also reduced the registration loop by 4 points. IMHO the loop was excessive. I think the official rule is "Any amount of buckle more than none, is enough." It made no difference whatsoever. Within 500 duplex copies both the side marks and the smudge were back. Curiously, after watching it buckle for 1/2 hour, I noticed that the rear part of the buckle flattens more than the front part of the buckle. There is no paper skew or image skew, and never was. It probably means nothing, but I'm hoping that some of these observations might eventually get me somewhere. =^..^=

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    Back after 60K. No resolution yet. =^..^=

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    I brought along our other KM trained tech today. The black developing unit solved the issue. That developing unit was supposed to rebuild at 8M. I ran 3000 of my customers job without a hitch. The job was supposed to last 360 minutes per the Job Screen. I left after the first 300 sets.
    =^..^=

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    We're calling the hotline Monday. The belt cleaner unit produced incremental improvements. If you know where to look, you can still find a few smudgy gray areas in that 32mm range. I tried to catch it in a photo, but the camera doesn't even pick it up any more. If only the enduser could forget where to look. =^..^=

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  • Zackuth
    replied
    Re: PRESS 1052 line

    Try the LPH. I had one of the LEDs start to fail and a new LPH solved the issue.

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  • allan
    replied
    Re: PRESS 1052 line

    That would leave you with the components that creates image. Like charge and dev bias. But in the same place every time? could it be a power or an EMI problem?

    Leave a comment:


  • blackcat4866
    replied
    Re: PRESS 1052 line

    2.3M and 2.7M respectively as of today. They've had all the scheduled, recommended by KM maintenance. The new transfer belt assy made it more faint but not gone. I've got the transfer belt cleaner assemblies on the way.

    I have a hard time reconciling that the machine can run from 1000 to 5000 without a single flaw before commencing the line problem.

    Ideas that I have been toying with:
    Transfer belt cleaner drive? There is no evidence of waste buildup in the cleaning unit.
    HVT? Perhaps some kind of a spike in the cleaner bias? But how does that fit with occurring exactly 32mm from the leading edge?
    How about transfer timing? Perhaps there is some residual image left on the belt that reprints on the next rotation. It does not look like a belt cleaning problem though. The "line" is not affected by positioning of large blocks of fill. Even where there is no fill in line, the "line" remains.

    Ah well, I'll stumble on. =^..^=

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  • allan
    replied
    Re: PRESS 1052 line

    Are you sticking to PM scheduled on those machines?
    Maybe time for some new units?

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    Transfer belt assy didn't help. Transfer cleaning assy on order. It seems to have spread like a virus to the other machine now.

    Customer is making threats now. That's always so helpful. =^..^=

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  • blackcat4866
    replied
    Re: PRESS 1052 line

    It was the plan "B" that bore fruit. I created the issue on the sister machine, so the transfer belt assy is part of the problem. It took 5 days for it to come back to the original machine. I interpret that to mean that the transfer cleaning unit is suspect also.

    As a plan "C" I see that there are HVT contacts to the transfer cleaning unit. Maybe HVT next? =^..^=

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