Supplying Toner - Panasonic FP-7818 Service Manual & Parts Manual

(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.
TDC sensor output Toner empty Hopper
sensor
High (Lower toner density) Detect
High Non detect Forward rotation Rotate
Low (Higher toner density) Detect
Low Not detect
• 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.
3-4
Toner Toner supply Add toner
motor bottle roller
Reverse rotation — Rotate
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Stop — —
Stop — —
Supply toner to developer unit
Supply toner to sub-hopper
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