Dear Friends,
I have a problem in Ricoh MP C4502,
The problem with the Yellow TONER .. The machine gives error msg " Add Toner " Yellow... once open and close cover it gives loading toner ..
I checked the following :
1- The drum rotate and everything is OK , but there is no Toner inside ...
2- I checked and cleaned the path from toner bottle , toner hopper pump,... until reaching drum .. OK
3- I checked Sensors .. All are OK ..
4- Finally, I found that the Toner bottle doesn't rotate .. although its backside motor rotate !!

Could anybody help me to fix this problem ??
Does anybody deal with this error before and fix it ??

Appreciate your help ...