I've got perhaps four machines doing this, maybe more. The machine makes a crease in the crossfeed direction, approximately 35mm from the trail edge of whatever size paper it happens on. It varies a little from 20 to 45mm from the trailing edge. And it's intermittent. I've run as many as 1000 pages without a crease. Then made a copy of my invoice and it's creased.
It's a timing issue of a sort. I've figured out that at the time of the event the leading edge of the paper is at the registration roller, and the crease exactly lines up with the vertical path roller. The first machine I worked on with this problem seemed to primarily affect the KD-1026 LCF (LT), but since then, I've seen the exact same issue from tray #1 (LT-R) or (LT).
Here's the list of things I've done to address it:
Disassembled, cleaned, oiled, and examined every component from the LCF up to and including the registration roller. Cleaned all the rubber. Replaced all the clutches, registration clutch 3 times, all photosensors. Checked spring return on the flags. Smoothed out rough spots in the guides. Widened the slot in the vertical path guide, so as to clear the sensor flag.
With the imaging unit removed I checked that the paper is firmly gripped by the registration rollers. The vertical path rollers are all spring loaded and spin smoothly. I tried different types of paper, and different orientations. It seems to happen primarily on LT, but other sizes and orientations also. Probably because the majority of the paper is LT.
I can be fairly certain that the crease is happening pre-registration. Of the samples, maybe 1 in 100 of the samples is a full Z-fold with no image inside the fold.
I've tried adjusting the loop anywhere from 5 to 40. I can make the paper skew consistently with values less than 17. I can make it Z-fold consistently with values above 28. I get the best results and minimal creasing with a value of 19, but definitely not fixed.
The doors all close correctly and latch at both the front and back.
Has anybody come across this particular issue? =^..^=
It's a timing issue of a sort. I've figured out that at the time of the event the leading edge of the paper is at the registration roller, and the crease exactly lines up with the vertical path roller. The first machine I worked on with this problem seemed to primarily affect the KD-1026 LCF (LT), but since then, I've seen the exact same issue from tray #1 (LT-R) or (LT).
Here's the list of things I've done to address it:
Disassembled, cleaned, oiled, and examined every component from the LCF up to and including the registration roller. Cleaned all the rubber. Replaced all the clutches, registration clutch 3 times, all photosensors. Checked spring return on the flags. Smoothed out rough spots in the guides. Widened the slot in the vertical path guide, so as to clear the sensor flag.
With the imaging unit removed I checked that the paper is firmly gripped by the registration rollers. The vertical path rollers are all spring loaded and spin smoothly. I tried different types of paper, and different orientations. It seems to happen primarily on LT, but other sizes and orientations also. Probably because the majority of the paper is LT.
I can be fairly certain that the crease is happening pre-registration. Of the samples, maybe 1 in 100 of the samples is a full Z-fold with no image inside the fold.
I've tried adjusting the loop anywhere from 5 to 40. I can make the paper skew consistently with values less than 17. I can make it Z-fold consistently with values above 28. I get the best results and minimal creasing with a value of 19, but definitely not fixed.
The doors all close correctly and latch at both the front and back.
Has anybody come across this particular issue? =^..^=
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