3-4
(3) Supplying toner
The Toner Hopper Unit supplies toner to the Developer Mixing Unit via the
Reserve Tank, so toner addition is done in two stages, by turning the Toner
Hopper Motor in either direction:
Forward Direction:
The bottle turns (via a spring clutch) to supply toner from the Toner Bottle to
the Reserve Tank. This direction is controlled by the Toner Volume Sensor.
Reverse Direction:
The Toner Supply Roller turns (via a spring clutch) to supply toner from the
Reserve Tank to the Developer Mixing Unit. This direction is controlled by the
TDC Sensor.
• A toner supply by the toner supply roller (approx. 16 seconds) can supply
1.4 g of toner of to the hopper.
• Separating the developer mixing unit from the toner supply unit of toner hopper,
the toner supply shutter is closed to prevent toner drop.
TDC sensor output
Toner empty
Hopper Toner Toner supply Add toner
sensor motor bottle roller
High (Lower toner density)
Detect
Reverse rotation
— Rotate
Supply toner to developer unit
High
Non detect
Forward rotation
Rotate —
Supply toner to sub-hopper
Low (Higher toner density)
Detect Stop — — —
Low
Not detect
Stop — — —
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