mp9001 backgrounding

[acsolutions]

Re: mp9001 backgrounding

Hello, I found an issue but not sure if I fixed the problem. I look at the bias adjustments specifically dev. bias image area, initial set at 550 was set at 800 set back 550 no more background. when I did a developer change I cleaned the charge assembly and the potential sensor on the drum assembly. not sure if this problem will return but is there anything else I should consider before closing this issue? I also cycled the machine and I saw the Dev. bias image area change to 554, nothing drastic. Thanks again for all your input

[fbkhan3]

Re: mp9001 backgrounding

Told ya development bias is disturb glad you found that

make sure development bias terminal is well connected.
it wouldn't jump up again to 850.

[acsolutions]

Re: mp9001 backgrounding

Told ya development bias is disturb glad you found that

make sure development bias terminal is well connected.
it wouldn't jump up again to 850.

Thanks fbkhan3, and all the rest for your assistance.

[ricoh]

Re: mp9001 backgrounding

I'm surprised you successfully cleaned the potential sensor. Those things don't usually like the look of a vacuum or a brush.
I was going to suggest on this the transfer belt also has a knack of causing either lack of density or a background condition around the 150k mark when the end user is using coated or rough stock.
But well done and I hope it was a long term fix.

[acsolutions]

Re: mp9001 backgrounding

I'm surprised you successfully cleaned the potential sensor. Those things don't usually like the look of a vacuum or a brush.
I was going to suggest on this the transfer belt also has a knack of causing either lack of density or a background condition around the 150k mark when the end user is using coated or rough stock.
But well done and I hope it was a long term fix.

Thanks, Yeah I never use canned air or a vacuum near electrical components or especially on potential sensors they have that reed that is very sensitive . I just removed it and lightly blew on it. As far as the belt is concerned it had a coating of toner on it, it did not seem to be cleaning well. Should I check or replace the blade? The copy quality is great with great solids.

[Shadow1]

Re: mp9001 backgrounding

May want to check on that machine in a couple days - don't know what would cause the dev bias to go that far off.

Best thing to do with potential sensors is leave them alone - a gentle wipe with a clean rag only when necessary, and I've found it's usually not. ID sensors are not nearly so fragile, but still don't like vacuums, and they always need wiped off.

For the record, I've had transfer belts run well over 1M, and blades that still haven't failed after 500k+. Cleaning the gunk off the rollers after somebody lets it go that long is a different story. The transfer belts never look like they clean well - For the longest time they had an indirect cleaning system - they'd pull toner off the belt with a biased roller, then clean the roller. It's only been the last 2 or 3 generations of that machine that they added that funky blade that hits the belt and roller, but I never saw that it was necessary. My adivice is as long as it's not generating a CQ issue let it ride until PM time, and that's one of those items that will stretch way beyond what the engineers say it will if you're pressed and don't have time for a really good PM.

Ricoh is right about the transfer causing odd problems, although I've always seen it only in the middle of copies, or at worst off through one side. Never had any machines B/W running enough coated stock to cause it, but had one running NCR paper - that carbonless multipart form stuff, and the chemicals in it eat everything. Drums, transfer belts, fusers... aligning rollers are a booger to replace...