error code SC324 in ricoh mp4000/5000

developer motor is blocked.
cause toner/developer spilled into the front side housing and blocked the gears
solution :open front door -remove the pcdu unit-put it in plain desk ,in the front side remove
gear housing cover,one screw ,then clean the 3 gears, remove them , remove all toner
remaining ,reinstall , check the motion of the drive gears manually,reinstall the PCDU.