Add toner ricoh aficio 2045

Toner supply is controlled with readings from TD sensor on the developing unit and the I.D sensor above the drum by default.

These are low cost parts and easy to change.
(The TD sensor on this model have been known to fluctuate back and forth by a fair margin so is a good place to start).

You could also try stripping down and cleaning out the toner hopper.
Check the four mylars are present and the grabber is opening wide enough to grab the toner bottle nozzle successfully.

Check the toner hopper exit slider is opening fully when the PCU is inserted.

I had one of these 'add toner' faults today and it was the toner hopper all clogged up inside.
The side bit where the toner drops down had hardened clumps of toner stuck around the side entrance mylar and the exit hole.

Check also the toner motor. I have seen these fail. Run simulation output check for toner motor. I would remove the toner supply unit and hold the motor when you run this simulation. Sometimes the motor turns but does not have enough torgue to turn the toner supply unit.

Try to check and fixed hopper put some remedy check the developer if is empty replace developer program 107 initialized,try to check toner motor if the bottle toner functioning and rotating