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marlon29
03-16-2012, 07:32 AM
good day,
we have a problem in one of our clients where in the drum unit of Yellow encountered scratches on it. We have already replaced the developing unit and the drum and the charge corona to check the cause but unfortunately, the newly installed drum unit has also been damaged with scratches. The scratch seem to be hit by something hard and the damaged was a straight line folloeing the curvature of the drum surface...

any idea on what causes the scratch?

thanks


marlon

twinax
03-16-2012, 09:08 PM
Hello,

Ok, with which engine ?

Regards,

Twinax

marlon29
03-19-2012, 01:53 AM
good day, I forgot to mention the machine model... its BH C6500

ineo+6501
03-19-2012, 10:52 AM
Do/did you use setting powder when installing a new drum?

blaze2000
03-19-2012, 01:17 PM
Pretty difficult to get a scratch/ gouge in a drum after it is installed. Were is the scratch? Did it occur in the same area?

richd
03-19-2012, 02:30 PM
When you changed the dev unit, did you also fit new dev ? Check the mag roller, if there are any marks on it, it is contamination or hard lumps of toner in the dev unit.
Seen it before.

marlon29
03-20-2012, 02:27 AM
good day,we have also replaced the developer with a new one upon replacing the developing unit. we have noticed that there are marks on the developing sleeve but not sure where the cause is. the scratch on the drum surface is not all throughout the whole surface. we have not yet resolved the problem up to this now.... hope you can help 'cause we are damaging drums...thanks

blaze2000
03-20-2012, 04:38 AM
Assuming that the drum(s) are installed properly, if you have another machine swap out the entire transfer assembly or at least take a close look at the assembly you have and investigate for any abnormalities.

ineo+6501
03-20-2012, 11:25 AM
Check the charge corona grid for kinks

KonicaTech08
08-02-2014, 07:34 PM
I was encountered the same problem on C6500 drum cyan scratch. have been replaced charging unit,dev,and dev unit but the cyan drum still scratch after running 200+ sheets. So far 4 units drum was scratch. The scratches look like hitting by sharp cutter blade. any solution is appreciated. Thanks in advanced.

machine was using DU102C

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