I'm having problems with the toner add on a C4500. Customer added a new toner, but it's still calling for toner. I tried turning off the "toner end", but it runs for a long time, trying to add toner. How common is it for the toner pumps to go out? I pulled it out and checked for clogging. It looked OK to me. (BTW-They've been using generic toner.)
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