Toshiba e-STUDIO 160 Service Manual page 53

• Magnetic roller
- Magnetic brush development -
The South and North poles are arranged,
as shown in the figure on the right inside
the magnetic roller. The developer mate-
rial contacts the drum forming a brush.
This is caused by the lines of magnetic
force between the South and North poles.
(6) Transfer
• This process transfers the (visible) image
developed on the drum surface by the toner
onto the paper.
• Method: Corona discharge (reverse polar-
ity of toner) is caused by the trans-
fer charger to happen to paper
passing between the drum and the
transfer charger.
The toner moves from the drum
surface onto the paper.
For smooth transfer, this machine features a transfer bias stage.
The transfer bias process prevents the charge of the transfer charger from flowing to the paper feed
pinch roller and paper transfer guide plate through the paper by applying the bias voltage (375V DC)
to the paper feed pinch roller and paper transfer guide plate. This is done to improve transfer effi-
ciency.
Normally, the corona discharge is applied by a voltage of 5.2 kV DC. However, to improve transfer-
ability at the leading edge of the paper, a higher output (5.5 kV DC) is applied to the leading edge of
the paper.
December 2002 TOSHIBA TEC
Sleeve
Drum
Rotation of drum
Toner
3 - 5 e-STUDIO160/200/250 COPYING PROCESS
Drum
Lines of
magnetic force
N
Magnet
Fig. 3-2-11
Paper
Transfer charger
Fig. 3-2-12
Progress of
paper
Transfer
charger
Fig. 3-2-13
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