Konica Minolta Bizhub 421

[978jose]

Hi, I have Bizhub 421 with 500k problem: when printing is OK, but when copying is like 2 inches black imaging. I already clean all optics components and the did not make difference.
Any suggestions please
Thank You

[kingarthur]

Re: Konica Minolta Bizhub 421

Hi, I have Bizhub 421 with 500k problem: when printing is OK, but when copying is like 2 inches black imaging. I already clean all optics components and the did not make difference.
Any suggestions please
Thank You

posting a sample of the fault might help

[978jose]

Re: Konica Minolta Bizhub 421

posting a sample of the fault might help

This what the machine doing it.

Thanks

[blackcat4866]

Re: Konica Minolta Bizhub 421

Your drum is worn out. I believe this model gets maintenance at 250K intervals, so most likely a drum, developer, and maintenance kit are called for. =^..^=

[978jose]

Re: Konica Minolta Bizhub 421

Your drum is worn out. I believe this model gets maintenance at 250K intervals, so most likely a drum, developer, and maintenance kit are called for. =^..^=

I put new drum and developer, but i have the same. the problem is just when copying, if I print It is working good.

Thanks

[blackcat4866]

Re: Konica Minolta Bizhub 421

I put new drum and developer, but i have the same. the problem is just when copying, if I print It is working good.

Thanks

How about the drum cleaning blade? Did you replace that too?

I'm sorry but I have some doubts about your observations. The sample that you photographed is clearly a worn out drum, and the issue would not disappear on prints. =^..^=

[978jose]

Re: Konica Minolta Bizhub 421

[QUOTE=blackcat4866;377768]How about the drum cleaning blade? Did you replace that too?

I'm sorry but I have some doubts about your observations. The sample that you photographed is clearly a worn out drum, and the issue would not disappear on prints. =^..^=[/QUO

I know is weir but when I print or internal test page is comes out good. The problem is just when it is copying.

[978jose]

Re: Konica Minolta Bizhub 421

[QUOTE=978jose;377773]

How about the drum cleaning blade? Did you replace that too?

I'm sorry but I have some doubts about your observations. The sample that you photographed is clearly a worn out drum, and the issue would not disappear on prints. =^..^=[/QUO

I know is weir but when I print or internal test page is comes out good. The problem is just when it is copying.

Yes Did replete the drum cleaning blade.

[JR2ALTA]

Re: Konica Minolta Bizhub 421

How about the drum cleaning blade? Did you replace that too?

I'm sorry but I have some doubts about your observations. The sample that you photographed is clearly a worn out drum, and the issue would not disappear on prints. =^..^=

A drum would go to the edges of the page.

Does it do it on the glass or just doc feeder?

Do the optics move freely? Any abnormal noise?

[Mr Spock]

Re: Konica Minolta Bizhub 421

Look closely at the top if image. There are digital lines mixed in. You are looking at one or more of the following: memory, ccd, system pwb, possible carriage but I doubt that. I would do firmware then the parts I listed in that order.

[978jose]

Re: Konica Minolta Bizhub 421

Look closely at the top if image. There are digital lines mixed in. You are looking at one or more of the following: memory, ccd, system pwb, possible carriage but I doubt that. I would do firmware then the parts I listed in that order.

Thank You very much. Other Tech and myself worked for 4 Hours yesterday. We put other PWB to try and nothing happens, other HVPS same thing. We check optics components and we didn't see anything abnormal (no noise). Today I'll check the optics systems again, I never had a problem with exposure lamp in those machine but I going to replace it just in case and going to work with firmware.
I let you if we find the solutions for this problem. Thank You again...

[JustManuals]

Re: Konica Minolta Bizhub 421

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[978jose]

Re: Konica Minolta Bizhub 421

Look closely at the top if image. There are digital lines mixed in. You are looking at one or more of the following: memory, ccd, system pwb, possible carriage but I doubt that. I would do firmware then the parts I listed in that order.

Ok than you so much. We going to work on this today and I let you if we fix the problem thanks again...

[nvram]

Re: Konica Minolta Bizhub 421

check mylars on front and back dev tank mag roller for perforations.

[978jose]

Re: Konica Minolta Bizhub 421

check mylars on front and back dev tank mag roller for perforations.

Thank you nvram, but the problem is just when copying, not when printing. I think is in the optics but I couldn't find the problem yet.