Supplying Toner To The Development Unit - Gestetner A294 Service Manual

2.7.2 SUPPLYING TONER TO THE DEVELOPMENT UNIT

[B]
[A]
[C]
A294D902.WMF
The toner bottle motor turns the toner bottle, causing toner to leave the toner bottle
[A] and drop into the toner entrance tank [B]. Recycled toner in the tube from the
drum cleaning unit also enters the toner entrance tank, and is mixed with fresh
toner from the toner bottle.
The toner transport coil [C] in the toner transport tube transports toner to the toner
supply cylinder [D]. The toner bank motor [E] drives the toner transport coil via the
toner supply coil clutch [F].
The toner supply motor [G] pushes air toward the toner hopper. Toner in the toner
supply cylinder is transported from the toner supply cylinder to the toner hopper
[H]. The toner hopper has two air pressure release filters and an air return tube [I]
connected to the toner supply cylinder. Air returns to the toner supply cylinder from
the toner hopper.
If the toner hopper sensor (in the toner hopper – see 'Toner Hopper') detects that
there is insufficient toner in the hopper, the toner bank mechanism is started up. If
there is toner in the toner entrance tank (detected by the toner near end sensor in
the toner bank), the toner supply coil clutch turns on for 2 seconds. The toner
supply motor turns on for 7 seconds at the same time as the toner supply coil
clutch. After this, if the toner hopper sensor still does not detect toner, the toner
supply coil clutch turns on for two seconds again until the toner hopper sensor
detects toner (this is done for a maximum of 10 times). When the toner hopper
sensor detects toner, the toner supply motor turns off 1 second after the toner
supply coil clutch turns off.
If the toner hopper sensor does not detect toner in the toner hopper after the toner
supply coil clutch has turned on ten times, the operation panel indicates SC495
(toner bank error).
The toner supply motor sensor monitors the toner supply motor. If the sensor
detects that the motor does not rotate during the toner supply process, the
operation panel indicates SC591 (toner supply motor lock).
SM
CÓPIA NÃO CONTROLADA
[H]
[I]
[G]
[D]
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CÓPIA NÃO CONTROLADA
TONER SUPPLY AND RECYCLING
[E]
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[F]
A294/A295