FS 3920 DN Stuck in "Add Toner" Condition

[Rmclean]

I have an FS 3920 with 71K prints that will not come out of an add toner condition. I have replaced the development unit, toner cartridge, engine, and main pwb's, with no success. Any ideas?

[bsm2]

Check the pins on the dev unit

[subaro]

On the below right hand side of the machine is located the dev drive solenoid clutch and dev drive gear. A few times i have had to replace that gear. Not difficult to remove. You can check if the dev mag roller is turning by placing a mark on the edge of the mag roller.

[CPI]

You can try going to service to developer and OK to start and press OK again to stop has worked before.

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