406ci not printing Yellow

[kuby]

Have a 406ci that is not printing the yellow. Have put a developing unit it and a drum unit from a good machine and still nothing. And the ones from this machine work in the other machine?

Glass under the dev/unit unit is clean.

[BillyCarpenter]

Is the DV unit turning? Sounds like you lost drive to the DV unit.

[kuby]

Found the problem. The yellow developing unit did not latch properly on this one. Fixed and making yellow now.

[FriendlyTech]

That little gray button on the developer will get you every once in a while.

[copiertec]

Found the problem. The yellow developing unit did not latch properly on this one. Fixed and making yellow now.

I ran into the same issue when on a 5002i, on a new client. Had me going for a few, retraced my steps and it turned out to be that grey lock on the developing unit.

[KYO_OEM]

If i get "white eagle on white paper", i remove the MC at first to see if i get solid color on DK unit without MC.
(On systems with aSi DKs you has to set U100/ AC "auto adjust" to "OFF" before, to prevent C510x/ OPC not needed)
Still blank--> HVT DV, no contact between DV<-->DK (grey hook), DV don`t turn...