Originally Posted by
dljorg
This spots on drums thing is an epidemic. KM just released a note today 1/24/2012 admitting there is a problem with both small spots on black and to a lesser degree on yellow as well. Temporary fix is to use a #104 drum from the 7000 series but only on black.
There will be a new drum with production beginning in March that will require a firmware update to make it work right. No doubt the KM site will have the stuff when it arrives.
Do not confuse this problem with the earlier one mentioned above and the change between the 102 lettered drums. This is a different problem altogether.
Like the many comments about ventilation and filters and agree with your techniques but am afraid that has no effect here.
As a temporary measure have tried two things with limited success.
These work only on new drums. Seems like when a unit is contaminated that's the end - whatever it is is on the brush and can't be removed.
1. Remove the cleaning blade from the drum unit and bend the metal support so that the center is about 1mm closer to the drum than the edges. Idea is to increase the blade pressure in the center where the spots seem to be worse.
2. Disassemble the drum unit and remove the wax bar and tension springs. Take the crossbar off, both main bearings out and remove the end plate with the two white gears. Out comes the drum cylinder. Carefully remove the stick-on seal around the cleaning brush support and pull out the cleaning brush. The wax bar is then right there. Know this sounds hokey but the result is a drum that will go 50K rather than 2k before the spots show up again.
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