bizhub 501 Light Prints/Copies

[MFPs R Now PCs]

We have a Konica Minolta bizhub 501 that continually keeps reverting to light prints and copies. The technician that took care of those machines has left and we believe he was manually adding toner via the following:
1. "Service Mode screen"Press [State Confirmation].
2. "State Confirmation screen"
Press [Sensor check].
3. "Sensor Check screen"
Press [Check Code] and, when entering the sensor check code in 3 digit through the copy count setting
button, a state (ON/OFF or value) is displayed in the Result area.
4. For the multi mode, press [Multi Code] and enter a three-digit multi code through the copy count setting
key.
5. When conducting the sensor check of other signal sources, repeat steps 3 to 4.

Performing the following inputs:

55 1 M4 Toner supply motor
2 SD5 Toner solenoid
3 M4,
SD5
Toner supply motor, toner solenoid
turn ON at the same time

But it keeps getting light again, Is there anything besides:
TCR Adjustment
and
Toner Density Adjustment
and
Laser Diameter Adjustment

That we can do? Please help?

[Woxner]

how old is the dev. its good for 250k. will go longer but may have issues. you should not tone up then run tcr. its best to start new. probably not toner add because you have no codes. also be sure to reset dev count before doing tcr for new dev. drum is 250k as well