Bizhub 350 Registration roller Jam problem

[Don N.]

Re: Bizhub 350 Registration roller Jam problem

I'd just removed the worn-out mylar on both sides of my mag roller, because I think it is touching the drum and scraping it off. I did also replaced the white spacer/collars, is it ok to just remove those mylars? I tried to fix it with a double sided tape but it wont hold.. Does that mean I should get a new dv310 developing Unit or is there a supplier for these kind mylars with strong adhesive? And what is the purpose of those? thanks sir

A new dv unit is just over $100 plus new dv plus drum unit rebuild kit must all be replaced together and procedure must be done precisely. All that is for image quality. You started with a jam problem. Did cleaning the fuser entrance guide plate smooth fix fan folded jams? Flushing the clutch? Once jams are fixed, then do drum, Dev, transfer. We usually retape over the mylars but they must be anchored down securely or just go with new dv unit, new dv, new drum. Must know f8 procedure and counter reset first or it will fail. I advise you get help with that. Hundreds of posts from techs not familiar, can't do it right.

[chejay127]

Re: Bizhub 350 Registration roller Jam problem

A new dv unit is just over $100 plus new dv plus drum unit rebuild kit must all be replaced together and procedure must be done precisely. All that is for image quality. You started with a jam problem. Did cleaning the fuser entrance guide plate smooth fix fan folded jams? Flushing the clutch? Once jams are fixed, then do drum, Dev, transfer. We usually retape over the mylars but they must be anchored down securely or just go with new dv unit, new dv, new drum. Must know f8 procedure and counter reset first or it will fail. I advise you get help with that. Hundreds of posts from techs not familiar, can't do it right.

The jamming problem is gone sir, after I replaced the registration clutch and cleaned the fusing entrance paper guide.. The one thing I'm concerned right now is the worn-out mylars in the dev unit. I have a new Opc Drum and a developer, I need to know if I should re-taped those mylars back or should I wait for a new developer box before I install those.. I also had read some posts here about changing the IU because I had once encountered the C2557 error and fixed it by clearing the counters and running F8 sir.. thanks

[Don N.]

Re: Bizhub 350 Registration roller Jam problem

We upgrade the spacers even on new dv units after seeing some tear up the rear mylar before a first pm is due. (Yes we are very careful about getting no dv in spacers). Used to do just the rear (gear drive) side, but now we upgrade spacers front & back on every 200's, 222's, 223's dv unit. I have taped mylars with high quality heavy duty packing tape on inside & outside when a hole is worn if mylar is still tight in place. That is key, or drum wear will return. As for F8 & reset counters, we have done that successfully up to about 30~40% of life. You need to be aware as they get older, the toner solenoid for the sub-hopper gets stuck open from rotten foam. That will cause a big toner dump & c2557. On any c2557 call, pull the I.U. out & put a flashlight on the solenoid plate behind it. See if it is engaged to the gear. If it is stuck open, (away from gear) you have to tear out the toner hopper drive unit & remove rotten foam from both solenoids. You must replace foam with 2-3 layers of elect tape or some thin rubber or cork shim or the solenoid will stay magnetized open. When you F8, the new toner density is memorized. If it is reasonable, great. If it is over or undertoned, well that will be it's new normal if it's within a reasonable range. It is possible to ease the ATDC setting up or down slowly. I recommend no more than 4 points at a time, followed by running user mgm't/toner replenisher drive at least twice to mix thoroughly. A higher # is more toner, lower is less. Example: a typical atdc is 145. if it sets up happy after a c2557 and re-F8 at say, 153, back it down to 149, run about 50 pages or just toner replenish twice, then back it down to 145 & toner replenish again twice. Toner is only added when it needs it, so you are just cycling it. Run high coverage copies to use up toner if decreasing the #. Run blank whites if increasing the #.
I know this covers several scenarios but maybe others will see this if searching the infamous c2557. Hope this helps.