Hi Mark et al
I see a lot of the 02 series so I see a lot of this problem. I believe there is a bulletin detailing the procedures everyone is discussing here - good procedures to follow.
Because I see this so often, I carry the toner sensor board and a toner pump (K). Easy to replace and saves a lot of time.
Had one today that turned out to be the DV unit, but its more likely the pump or sensor board. I always clean out the hose and the valve that feeds it, since they can get clogged. I keep an eye out for toner dropping in back where the toner hose meets the valve.
Non Ricoh toner is often involved. Also have seen Ricoh toner misread as 3rd party as a symptom of this issue. I have not initialized the DV as part of this procedure, unless I was replacing the DV unit.
Hope this helps.
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