BH454e Missing 1" wide section of print front to rear.

[DSharpe]

check the corona cleaner, ill bet its not in the home position. also use the wand to clean the lasers.

All that is fine. Machine has 112,000. Also, this is very intermittent when it happens. i had the machine in my shop and ran 6000 copies on it with no problem, after mfp and main control board was replaced. It was sent back to the customer a little over a month ago and its magically showed up and only once, that she has noticed. She told me today that her phone system had a melt down the other day and killed all the phone lines to where she could actually smell the electrical smoldering and this machine is also used as their fax. I hooked up a line monitor to it today. This is a strange one!!

[Synthohol]

take a sky shot on long paper and stop it in the fuser. then check belt and drum. maybe take out DV and check the brush on it.
other than that maybe take out the laser unit and check the window for toner,debris.

[blackcat4866]

Here's my question:

Is it a void of missing image, or is the image neatly sliced at the cutoff, then re-starts 25.4mm over, running off the page? Is it in the feed direction or crossfeed direction? Is it always 25.4mm? The difference is important.

If the drum were losing drive intermittently, the image would neatly sever crossfeed then resume again at the same point further down the page.

If the HDD was intermittently dropping image data, you might have the image stop crossfeed at some point, lose 25.4mm of data, then continue with found data, and the image would end correctly at page end.

If primary charge cleaner was stuck mid-path, you might get a void of missing image 25.4mm wide in the feed direction.
=^..^=

[DSharpe]

Here's my question:

Is it a void of missing image, or is the image neatly sliced at the cutoff, then re-starts 25.4mm over, running off the page? Is it in the feed direction or crossfeed direction? Is it always 25.4mm? The difference is important.

If the drum were losing drive intermittently, the image would neatly sever crossfeed then resume again at the same point further down the page.

If the HDD was intermittently dropping image data, you might have the image stop crossfeed at some point, lose 25.4mm of data, then continue with found data, and the image would end correctly at page end.

If primary charge cleaner was stuck mid-path, you might get a void of missing image 25.4mm wide in the feed direction.
=^..^=

Its always the same size and going from front to rear. The samples i have seen most of them are on the right side of the page but i have also seen it once on the other side. Its missing but neatly sliced at the same time. No smudgy edge just clean cut. This sample is much better. This is only 2 pages..it played with my eyes when i first seen it, lol.

Sample.jpg

[blackcat4866]

So the data is missing in the void crossfeed, and the page image aligns on all four edges? =^..^=

[DSharpe]

So the data is missing in the void crossfeed, and the page image aligns on all four edges? =^..^=

The data is indeed missing in the void cross feed. If you notice the sheet on the bottom that void has actually moved a little more to the right of the page. The entire image is there with the exception of that void which may happen once a week or once a month.

[blackcat4866]

Ok, let's start with what it's not:
It's not primary charge, or anything to do with charge or drum ground. Any charge loss would be indicated by black areas, not voids.
It's not a drum drive or registration drive problem. The image is correctly registered on the paper (if not all there).
It's not a charge cleaner issue, which would be in the feed direction.
Hey, what if one of your LTR feed units was overdriving and making a Z-fold, imaging, then opening the Z-fold before fusing ... nope, that doesn't work. It would shift your trail edge registration.

It's unlikely to be be developer drive or transfer charge loss. It would happen more frequently, have varying proportions, and not have crisp edges or clean voids. You'd also see toner density symptoms like low developer density codes or add toner indications.

This leaves the laser unit, image processing board(s), and HDD.

Does that narrow it down a little? =^..^=

[DSharpe]

Ok, let's start with what it's not:
It's not primary charge, or anything to do with charge or drum ground. Any charge loss would be indicated by black areas, not voids.
It's not a drum drive or registration drive problem. The image is correctly registered on the paper (if not all there).
It's not a charge cleaner issue, which would be in the feed direction.
Hey, what if one of your LTR feed units was overdriving and making a Z-fold, imaging, then opening the Z-fold before fusing ... nope, that doesn't work. It would shift your trail edge registration.

It's unlikely to be be developer drive or transfer charge loss. It would happen more frequently, have varying proportions, and not have crisp edges or clean voids. You'd also see toner density symptoms like low developer density codes or add toner indications.

This leaves the laser unit, image processing board(s), and HDD.

Does that narrow it down a little? =^..^=

I have replaced the mfp and the main control board. I can definitely see the laser being a possibility not sure about how the HDD could cause that? But then again, that’s why I’m looking for help from the experts.