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Text excerpt from page 250 (click to view)
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 developer. When the toner sensor (TNS) detects a low toner level in the developing unit, the toner replenishment signal is output to the main PCB (MPCB). The main PCB (MPCB) 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.
1 Developing unit housing 2 Developing roller 3 Toner sensor (TNS) 4 Doctor blade 5 Right developing spiral 6 Left developing spiral