Savin 6045 feed direction banding

[Guest]

I am having this problem with a Savin 6045. I have updated the FW, replaced all PCU/Dev units,ITB belt and bias rollers with end bushings, ITB cleaning unit, and PTR unit. I have attached some pics of the results i get when i convert white to a solid color.

[banginbishop]

How many copies has this done? whats the pm cycle looking like?
I've had engineers force the transfere unit in and break these and leave them in without saying. The way the white banding appears looks like possibly a transfere roller/bearing but i wouldn't rule out the fuser section as these can get left unserviced even when parts are supplied in the service kit and it can give off funny copy quality especially whn its done twice the life

Have you stoped the machine in mid copy and saw what the copy is like before it hits the different sections? i know its a pain stripping it down to check but it can rule out a section and costly parts you dont need if your still unsure.

Sorry i can't be of much help as the most i get with these is toner dropping on the paper but the machines have normally done in excess of 1-2 million and we dont replace the whole pcu/dev unit just the service kit i.e. drum, charge etc.

[Girvin13]

The machine has about 243 K on it total. The PM cycle on the current parts is no higher than 30 K on ANY of the PM parts.The machine is fresh. I will have to try to stop the copy mid way, ill run 11x17 for a better view. I will report back tomorrow with the results

[cobiray]

Are the printed examples LEF or SEF? I'd lean towards the ITB or transfer assembly as the voids seem to be identical on all of the colors. If they are LEF it could be a contact issue in the paper transfer section. IT almost looks like a bad drum ground.

Did this happen after a service call and might be tech induced? I'm not pointing fingers, but if that's the case you might check whatever was serviced prior to the issue arising.

[msaeger]

If that is SEF Did you replace the developer units or just the developer ? I have seen that several times and it has always been the dev units.

If it's LEF I would guess transfer rollers in the transfer unit.

[pspahr]

Howdy bud...Dev units, man, dev units.

[FRIDGEMAGNET]

Howdy bud...Dev units, man, dev units.

This seems to be the norm when customers are running high volume and high color ratio like blue Powerpoint pages.
The dev is detoned. The only way I have found to get rid of it is to replace the dev and dev unit and PM cycles come way down when color ratios are high, like dev changes at 80-90k.

[Girvin13]

this was the reason for a service call. all of the dev units and pcu units have been replaced. the IT unit has not been replaced, but all the pm parts on it have including the bias rollers and end bushings with springs, charge power pak, ITB, cleaning unit as well

im totally stumped on this one
ive even had our district Savin rep try to fix it but no go and he continues to throw parts at it and nuthin werks

[NCArt]

im totally stumped on this one
ive even had our district Savin rep try to fix it but no go and he continues to throw parts at it and nuthin werks

Don't forget to tell em that the entire ITB was replaced and still had the banding.

[pspahr]

district Savin rep try to fix it but no go and he continues to throw parts at it and nuthin werks

Well there's your problem....stop throwing parts at it and start putting them in it

[Shadow1]

Looking at your examples the problem is common to all 4 colors - this could be the ITB speed sensors dirty. I've had a lot of problems on some machines, others run fine - pull the belt unit, there is a clip holding the ITB down at the back somewhat right of center - 1 screw from the back and it comes off, the sensors are underneath the belt. Canned air is usually sufficient to clean them off.

I don't think this is your problem though. Since the image is uneven from front to back of the machine I'm betting there is a problem at the PTR. Either the transfer roller in the belt unit, or the PTR assembly itself. Unfortunately the rollers are very similar in diameter, so it's hard to tell which side.

This machine's paper transfer bias is reversed from the A6513 (B023) machines - the PTR roller is at ground, and there is high bias behind the belt. In the old system if the paper was even slightly damp the bias would bleed and you would get washed looking copies. In this system it doesn't matter because the toner gets kicked off the belt instead of attracted toward the paper.

It looks to me like the PTR assembly is not lifting into contact with the ITB properly - Had lots of problems with that goofy sliding latch on the transfer/fuser tray. Not to mention the PTR assembly can be a real bastard to get out and back in properly.