Brother International IntelliFax-3550 Service Manual - Page 25

through the five processes, charging, exposing, developing, transferring, and erasing pro

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2.2.2 Print process mechanism Toner augers Toner cartridge Toner sensor Paper Developer roller Transfer roller Drum unit Toner supply roller Polygon mirror Polygon motor Laser unit Cover glass Mirror Laser-sensitive drum Cleaner roller Charger (Corona wire) Mirror Electrical charge on the drum surface (V) The print process unit works with laser beam, electrical charges, and toner. The graph below shows the transition of electrical charge on the surface of the laser-sensitive drum through the five processes: charging, exposing, developing, transferring, and erasing processes. +1000 +700 A single cycle of laser-sensitive drum operation 1 2 3 4 (a) (b) +400 +300 1 Charges the drum surface positively. 2 Exposes the drum surface to a laser beam to form a latent image and develops the latent image with toner. (a) Unexposed area (Non-image area) (b) Exposed area (Image area) 3 Transfers the toner-formed image from the drum to paper. 4 Erases the residual potential. Time III - 6

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III –
6
2.2.2
Print process mechanism
The print process unit works with laser beam, electrical charges, and toner.
The graph be-
low shows the transition of electrical charge on the surface of the laser-sensitive drum
through the five processes:
charging, exposing, developing, transferring, and erasing pro-
cesses.
+1000
+700
+400
+300
1
2
3
4
(a)
(b)
Time
A single cycle of laser-sensitive
drum operation
Electrical charge on the drum surface (V)
1
Charges the drum surface positively.
2
Exposes the drum surface to a laser beam to
form a latent image and develops the latent
image with toner.
(a)
Unexposed area (Non-image area)
(b)
Exposed area (Image area)
3
Transfers the toner-formed image from the
drum to paper.
4
Erases the residual potential.
Paper
Transfer roller
Drum unit
Laser-sensitive drum
Cleaner roller
Charger (Corona wire)
Toner sensor
Toner cartridge
Cover glass
Laser unit
Polygon mirror
Polygon motor
Mirror
Mirror
Toner augers
Developer
roller
Toner supply
roller