M806 stacker page skew

[Demo42]

Hello,

I've been having this issue for a couple weeks now with no luck on solving.

Essentially, we have 5 M806 printers with the stapler/stacker attachments on all of them. One of them will periodically skew one of the pages of a stack where if you're staring straight at the exit of the stacker the closest left corner of the paper is pushed much further out then the right corner. This causes the page to not be stapled in the stack and has to be re-stapled. Through testing I've found that it seems to always be between the 3rd and 5th pages of any given stack. Oddly, it does not happen with every stack.My test prints were from the paper path tests to rule out driver issues. Of the 5 printers, this one is on the latest firmware and in case that may be the cause I have not updated the rest. On the firmware, it was on the 4.11 version and today I tried to revert it back to 3.9.8 in case that may be the issue. It succeeded, but no change. I have tried a different stacker attachment which unfortunately resulted in the same issue. Though when I did attach the other stacker and power on the printer, it reported it was "upgrading" the stacker. I can only think it was upgrading the firmware on the stacker, but could be wrong. Since this issue is so sporadic it's hard to pin down and of course the printer is out of warranty as of last month. Any help is very appreciated.

[Repairatrooper]

If you got the upgrade message when changing stackers that means your printers are on different firmware revisions and you really should upgrade them all to the current one. Even a tiny broken tip on one of the guides in the paper path can be enough to induce this type of behavior or a stacker that is not timed properly.  The troubleshooting and resolution on this likely requires resources that I cannot share due to my NDA with HP and my recommendation would be to either obtain the full troubleshooting and service guides for both the printer and the stacker or contact a HP service provider who has a trained technician on staff.

[Demo42]

I thought it could be something along the lines a broken guide or another piece, though when I connected a different stacker with the same results I started to think it was related to the software somehow. Could it be receiving the timing from the printer itself which would carry over to another stacker?

I'll also look for a full troubleshooting and service guide, hopefully I will find something to lead me in the right direction.

If you can't help further due to a NDA I understand, thank you for your assistance either way!