paper bounce on 7655 help

[kristianeyman]

hello PP community, i would like to know if anyone can help me out with paper bounce and registration sheet to sheet on thicker stocks 300grs or 12pt. i run most of my jobs on these types of stocks and when sent to be cut there is a lot of variance and it looks due to bounce. has anyone encountered this problem, if so are there any solutions, if there are no solutions how may i better the problem? thanks!

 

[X33]

how much is a "lot of variance"?

 

[OkiTech]

Friend of mine had a DC-250 with serious registration bounce 1-2mm, with pretty much anything. After about 2 years of complaning Xerox told him that it is normal, and within limits. I had advised him to tell Xerox to take that machine and showel it we all know where to. So he did, so did they. That machine is gone without big battle but not without attorney involwed... He bought used DC240 with like 500,000 pages on it and it actually registers wery well. It cost him about $1200 for Xerox Authorized partner give him a service contract so he is happy, no more lease payments, just contract click charges. I think some of this machines have a diffect. Being a Copier Service Engineer, I'd say bad registration clutch but bigget units use Step Motors driving Registration rollers directly or VIA belt and pulley with One-way bearing involwed for free back spin. If, motor had been replaced, and it didn't help - makes it to be more complicated because what may happening is system accelerate the rollers with different speed / moment and than we would need dig deeper in logic boards, power supplies etc.

 

[OkiTech]

If you don't have a service contract, lets go with obvious:
#1 look at your registration rollers (If you don't know what those are or where they are, please disregard this all idea and call any service tech) One of them is steel and other rubber coated (they both could be rubber coated) Nice and clean, they are deep matte black, if look otherwise, take clean rag, spray with WD40 (best stuff) find the way to rotate them and clean. After done take a dry rag and wipe excess of oil, leave it alone for 30 min -1 hr, if possible find a way feed few sheets of regular uncoated paper through them to make sure there is no oil left. Try the machine. If rollers were obviously dirty it will help a lot if not, hmmmmmmmm

 

[kristianeyman]

when trying to print front ro back business cards or flyers seems like i need to give the machine some ritalin. i think the problems so to speak is that this particular machine does not have a registration board like some of the larger DC machines (6060, 2045, 5000) and if the problem bugs me this much, maybe just sell my two 7655' and get a more production machine? but the question still arises that if a new 250/260/252 is the same print engine and does the same +/- why is the 252 not a office copier?

 

[X33]

the engine may the same, but the "brain" of the machine is different. The DocuColor 252 has a Fiery controller, it has features to adjust registration besides many other color management tools.

On a DC252 you can get an Oversized High Capacity Feeder which will minimize the registration error even further.

 

[kristianeyman]

so without any adjustment in the rip, would say a dc6060 or 252 register better than my 7655 just sending the same file through?

 

[graficworx]

so without any adjustment in the rip, would say a dc6060 or 252 register better than my 7655 just sending the same file through?

The should. While the 7655 is a good machine, it's not really a production class one, some of the software and hardware required for good registration isn't there.

 

[jotterpinky]

We have a 7655 as well as a DC250, I've found that both have virtually the same registration...in reality they are the same piece of machinery, albeit with a different front end. We run EVERYTHING, except prints that don't need any sort of registration from our bypass trays in both machines making sure the stock is lined up flush and the guides are tight against the edges. While registration is good it's not great but very usable for most work.

We've found that even though these are the same machines, that Xerox is much more serious about maintaining the DC250 with regards to registration and print quality (sometimes you get what you pay for). While the 7655 does a good print I think the screening and color is much better and more accurate (like you would expect) with the professional front end on our 250.

We also own several Xerox 700 engines and the registration is quite a bit better with better software tools on the engine to get good alignment, if you are doing tight registration work very often I would think seriously about spending the extra money for the extra speed, quality, registration, duplex capability and uptime that we've found we get with our 700 vs our 250.

 

[kristianeyman]

thanks for all the replies and insight. to ask one more question, and maybe this is where i am missing, what types of job 50%+ come out of your digital machines (business cards, flyer, posters) i think that trying to make this machine or perhaps a dc6060 register like offset is like asking elephants to fly. sorry to ask this, just its that i have a couple of months in and trying to see in the US market what are where are the applications for digital machines. thanks for taking the time!