image quality problem Minolta bizhub 750

[cristian]

After I was changing the drum, blade and the developer i have some bad copies.
Attached i put a sample. Any ideeas?
sample.jpg

[Mr Spock]

Re: image quality problem Minolta bizhub 750

did you reset counters and run the appropriate adjustments?
Crash the machine just before fuser and see if images is good or bad.
If good then I would check the fuser unit if bad then check the transfer section and drum image.

[cristian]

Re: image quality problem Minolta bizhub 750

image bad before the fuser. i ve checked all the transfer part, wires cleaned, grid cleaned,exp lamp cleaned,tcsb cleaned.When running adjustments :error 1 at auto max density and also auto gamma :error 1.New drum+ blade, new developer.

[JustManuals]

Re: image quality problem Minolta bizhub 750

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[Mr Spock]

Re: image quality problem Minolta bizhub 750

image bad before the fuser. i ve checked all the transfer part, wires cleaned, grid cleaned,exp lamp cleaned,tcsb cleaned.When running adjustments :error 1 at auto max density and also auto gamma :error 1.New drum+ blade, new developer.

Under the drum on the left side is 2 sensors these are you gamma and max density sensors. If they are dirty then this is the issue. They may be bad but I have not had to replace them. Clean with air only. Also make sure the grid is fully seated.

[cristian]

Re: image quality problem Minolta bizhub 750

Problem solved.I have cleaned the sensors, and i have found that one corotron wire has 2 pieces of 1 cm covered in black toner (after i have cleaned with alcohol- i need glasses) .I could not clean with alcohol, nor with fibreglass, so i had to do it with my nails.The wire was a little sinuous, but the image quality is OK now. I will replace the wire a.s.a.p..
Attention: 2 distinct cm not shiny as gold on the corotron wire may give this fault

[JR2ALTA]

Buy a pencil eraser, ones designed to look like pencils can be sharpened so you reach both side of wire