Printing Problem - Konica Minolta biz hub c451 (Shades)

[matsan_offset@yahoo.com]

Hello,

I have problem with my K-M BizHub C451. Everything going ok till first 50-60 (approx.) prints but later on it start to give shades on both BW and colors.
IMG_0599.JPGIMG_0859.jpg

Also at white parts of image or empty pages it gives very light yellowish/reddish (in color prints) and greyish (in B&W prints) colors.

IMG_0595.JPG IMG_0598.JPG

Do you have any idea of the reason?

Thanks in advance.

[Synthohol]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

in service mode, test prints, gradation pattern c/m/y/k print them out, may help isolate the problem.

[matsan_offset@yahoo.com]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

in service mode, test prints, gradation pattern c/m/y/k print them out, may help isolate the problem.

IMG_0874.jpgIMG_0875.jpgIMG_0876.jpgIMG_0877.jpg

[Flash]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

I would say the black imaging unit is shot.

[matsan_offset@yahoo.com]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

I would say the black imaging unit is shot.

So if we change this unit, will the problem be gone?

[darry1322]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

The black unit is bad. Replace that unit, do the color alignment, and gradation adjust. See what you've got from there.

[Synaux]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

Make sure to add something to the lever to push the K IU all the way in or buy the mod (there are many posts about this).
From the looks of it, the black IU is most likely spewing developer. If it is leaking dev, take it out to see if there is any developer on or around the IU (use a magnetic screwdriver to see if it clings--if it does its dev and not toner).
If this is the case you need to clean the IU cavity, as well as the Print Head and the yellow IU! When I see dev spew I personally also clean the IDC sensors and transfer belt.

Also, I am willing to bet your yellow IU is bad--destroyed by the dev.

Also:
Go in service mode > counter > life
Post the life of the IUs

(If it is spewing dev. you might also have a bad HV board.)

[1FRY1]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

Matsan

Do I take it you are a user rather than a technician ?

[MFPTech]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

So if we change this unit, will the problem be gone?

This is a typical user response. You are not a tech, are you?

Sent from my SGH-I337M using Tapatalk

[matsan_offset@yahoo.com]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

Matsan

Do I take it you are a user rather than a technician ?

i am not technician, just a user

[matsan_offset@yahoo.com]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

This is a typical user response. You are not a tech, are you?

Sent from my SGH-I337M using Tapatalk

i am not technician, just a user

[Synaux]

Re: Printing Problem - Konica Minolta biz hub c451 (Shades)

i am not technician, just a user

Yea...you can try changing the IUs, but you probably need to get a tech out to fix the underlying issue.