Well every time i do pm on 400/421/500/501 I see toner build up on mylarian strip that protects developin roller.
I saw it on new machines whit 20 K so don't think its related whit how much copy it did. From there it goes evrywhere

Dont know why but someone suggested that on this forum that adjustment of "Toner density adjustment" should fix the problem. In my case it didn't help. Mybe in urs will.
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