Kyocera FS-9120DN Service Manual page 155

FS-9120DN/9520DN
2-1-4 Developing section
The developing section consists of the developing unit and the toner container.
The developing unit consists of the developing roller where a magnetic brush is formed, the doctor blade and the
developing spirals that agitate the toner.
When the toner sensor (TNS) detects a low toner level in the developing unit, the toner replenishment signal is output to
the engine controller PWB (EPWB). The engine controller PWB (EPWB) that has received the signal turns on the toner
replenishment solenoid (TNFSOL) and replenishes toner from the toner container to the developing unit.
Also, the toner container sensor (TCS) checks whether or not toner remains in the toner container.
2-1-10
Figure 2-1-11 Developing section
Developing roller
Left developing spiral
Figure 2-1-12 Flow of the toner
1 Developing unit housing
2 Developing roller
3 Toner sensor (TNS)
4 Doctor blade
5 Right developing spiral
6 Left developing spiral
Right developing spiral
Developing paddle
Flow of the toner