C1085 duplex registration issue after 15 sheets

[dagoof]

Got a strange one on a c1085 - the image is slipping out of registration predominantly on the trailing edge (both sides) when duplexing. It happens almost bang on after 15 sheets give or take, never an issue with the first dozen or so. If I run batches of 15 sheets it's fine, with only a few seconds in between batches.
It doesn't happen when running simplex. Sporadically the issue doesn't happen at all (perhaps when the machine's been running for several hours).

Anyone got any thoughts? Spoke to some who said they didn't think the registration roller would be a factor but I'm not sure

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Anyone care to throw their hat in on this? Still got me stumped!

[Toxic]

Re: C1085 duplex registration issue after 15 sheets

Are you tech or end user?
Did you try something before to solve that problem?

[tsbservice]

Re: C1085 duplex registration issue after 15 sheets

Of course he is a tech with that nice little badge Still learning...
Imho every reliable tech should anchor on that motto.

@dagoof, will upload some docs in few minutes, check your PM.
Please, bear in mind I'm not a production guy, so articles may be somewhat or completely irrelevant.

[methogod]

Re: C1085 duplex registration issue after 15 sheets

what's the meter?
stock?

which way is it shifting?

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Big thanks to Tsb

Methogod - The machine's got a fairly high meter (6m). This was using a 300gsm silk stock.
The CMYK was slipping out of registration horizontally in the direction of travel (leading to trailing), I'll try getting a couple of pics.

[methogod]

Re: C1085 duplex registration issue after 15 sheets

would think registration assy, at 6m. was it replaced at all?

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Hi Methogod, we replaced the whole reg assembly but it's not really helped (it now pulls the reg back after slippage but will continue to fall out of registration on a cycle of 10-15 sheets).

What would you suggest next?

[BOTOY]

Re: C1085 duplex registration issue after 15 sheets

Hi,
I think this is no a mechanical issue. Can you reset the machine in factory setting, then make un new print/side setting?
Could you take some picture?

[Synthohol]

Re: C1085 duplex registration issue after 15 sheets

does it behave if regular 75-80 gm2 paper is used?
does the tray being used matter?
have you tried the paper through the bypass (if installed or accessible)
jig the door interlocks and watch the edge of the paper as it passes and look for drift.
if drifting check for even tension on every hard roller(s) in the paper path.

[blackcat4866]

Re: C1085 duplex registration issue after 15 sheets

Big thanks to Tsb

Methogod - The machine's got a fairly high meter (6m). This was using a 300gsm silk stock.
The CMYK was slipping out of registration horizontally in the direction of travel (leading to trailing), I'll try getting a couple of pics.

This is the maximum media weight AND glossy. I would be very surprised if it didn't have color registration issues. If you drop the gsm to 280 the problem will disappear. =^..^=

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Thanks all for the replies

Blackcat - tried 280gsm silk, it's the same. 225gsm doesn't seem to be effected. However, it worked ok previously with the 300gsm stocks.

Synthol - have tried a 225gsm gloss and it works ok. Tray doesn't seem to matter (tried 2 & 3 from PFU, no bypass).
There is almost never a reg issue running simplex, so I'm pretty sure there's no major drift from PFU, this seems to be primarily limited to duplexing.
It tends to effect the mid-to-bottom of the sheet (trailing edge rather than leading edge).

Botoy - Yes, I'll get pictures. Is there anything specific I could try resetting before a reset on the whole machine?

reg.jpg

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Could anyone suggest anything? I'm guessing it's a mechanical issue in the ADU (i.e. rubbers worn)?

[Toxic]

Re: C1085 duplex registration issue after 15 sheets

You said 225gsm is ok,no problem?
Did you try to trick machine and set up 225gsm and acctually put 300gsm into the tray and check does it have same problem.

[dagoof]

Re: C1085 duplex registration issue after 15 sheets

Hi toxic, I tried cheating it at 225 setting but got the same result: first 12-15 sheets ok, then 7 bad before it self corrects, then 7 good, 7 bad etc on loop (give or take).