Brother International IntelliFax-3550 Service Manual - Page 26

When the laser-sensitive drum holds a positive electrical charge, the laser beam issued

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(1) Charging process The high-voltage power supply applies DC bias to the corona wire to generate ion on the grid. The ion uniformly charges the surface of the laser-sensitive drum to approx. 1000V which is kept by the varister grounding the grid to the frame. Varister Approx. +++-+-- -- - ++ 1000V - + -- - ++ - + ++ + + + + + ++ + + Approx. 280V Positive charging source Aluminum drum Drum Grid Laser-sensitive layer High-voltage power source Corona wire (2) Exposing process When the laser-sensitive drum holds a positive electrical charge, the laser beam issued from the laser unit scans the drum according to the print image to expose the drum surface for neutralizing the spots where black should be, forming an electrostatic latent image. Laser-sensitive drum Laser beam Laser detector Laser diode Paper Laser beam f θ lens Polygon mirror Lens Polygon motor III - 7

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III –
7
(1)
Charging process
The high-voltage power supply applies DC bias to the corona wire to generate ion on the
grid.
The ion uniformly charges the surface of the laser-sensitive drum to approx. 1000V
which is kept by the varister grounding the grid to the frame.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
---
Laser-sensitive layer
Aluminum drum
Drum
Grid
Varister
Corona wire
High-voltage
power source
Approx. 280V
Positive charging
source
Paper
Laser-sensitive drum
Laser beam
f
θ
lens
Polygon mirror
Polygon motor
Lens
Laser diode
Laser detector
Laser beam
(2)
Exposing process
When the laser-sensitive drum holds a positive electrical charge, the laser beam issued from
the laser unit scans the drum according to the print image to expose the drum surface for
neutralizing the spots where black should be, forming an electrostatic latent image.
Approx. 1000V