hi.if you notice you not getting yield.strip drum out of unit.i use vacuum an I vacuum brushes and excess toner from dev.take charge roller out and clean with either mr mckenic or even dish washing liq.just dry with clean cloth after.
doesn't make it a new drum but you will get a couple of thousand prints getting you much closer to yield. just rem to do a auto grad with a clean laser for mc to get a accurate dens reading
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