C3070 Registration Issues

[orestesp]

Hi everyone,

I am at my wits end with this one. I have a C3070 with 850k counter with the PF-707m + some finishing options. Every now and then, the press goes complete haywire with the registration. One (or both) sides will be massively skewed for absolutely no reason at all.

I have adjusted the front-to-back registration using the scanner platen glass (see: Both Sides | [Scan Meas.]) and the registration is near spot-on.

I try to print the job that you see in the photos inside the .pdf I attached. Registration is all over the place. I print test pattern #16 that's used to check for skew etc. It's perfect. I then print a job that was printed yesterday on the same stock (13 x 19" 350 gsm coated stock), comes out perfect with excellent front-to-back registration. I then re-print the problem job, same exact thing.

The way I got this printed is by lying to the press that the paper was Red colored. Even then, every other sheet would jam with a J-3102 code. I cleaned the centering sensor (which was already clean to begin with) but it didn't have any effect on the situation whatsoever.

Has anyone else dealt with something similar?

 

[NorwoodPress]

This is what I get now and again on our Xerox Versant 280.

 

[SoggyWinter]

I have never worked with KM hardware, but I've had Xerox registration issues caused by partially broken gears, stretched pulleys, and heat damaged servo motors.

 

[EdwardB]

What kind of RIP? Do you have any kind of Tray Alignment Overrides turned on?

 

[orestesp]

This is what I get now and again on our Xerox Versant 280.

It's at least comforting that there's 2 of us!

I have never worked with KM hardware, but I've had Xerox registration issues caused by partially broken gears, stretched pulleys, and heat damaged servo motors.

The press has a relatively low total counter (~800k) and was mostly used to print B&W A4 copies - if you can believe it - before us...

What kind of RIP? Do you have any kind of Tray Alignment Overrides turned on?

The stock Konica RIP IC-605A unfortunately (or fortunately, depends on how you look at it, because I had to re-image my last Fiery constantly).

I don't think there's overrides in the RIP apart from the image shift, I remember the Fiery had some sort of its own tray calibration procedure. The problem is very inconsistent honestly, the only constant is that it happens in the 350 gsm coated stock I use, everything else (even synthetic 300 gsm) runs just fine.

Just an FYI, I was given this suggestion, one of the springs on my press was a bit dislodged, I put everything back to where it was supposed to be but it still did it again today... Guess I'll have to take the reg unit apart to investigate.

 

[orestesp]

I seem to have found the issue (fingers crossed).

Someone had installed the larger clip that you see on the right (55VA42120 SHAFT STOPPER) instead of the smaller one in the left (can't remember the P/N but it's SHAFT STOPPER /4) in the groove that holds the 2nd transfer unit in place. The larger clip, rather predictably, didn't fit in the groove in the shaft that the 2nd transfer unit slides onto properly, causing excessive slack/movement of the 2nd transfer unit.

I suppose with thinner stocks this wasn't much of an issue but with the 300/350 gsm stock is when issues arose.

I've since replaced it with the proper one and so far no issues... Only time will tell if it's gone for good!

 

[Gal]

Try another thing that also happened to me while ago
Go to expert settings and change the machine speed to the slowest, if this is working well they need to change the registration plate