Xerographics; Major Functions - Brother HL-4000CN Service Manual

5.8

Xerographics

5.8.1

Major functions

Scanner ASSY
Scanner ASSY (raster output scanner assembly) is an exposure unit to generate laser
beams to form electrostatic latent image on the drum surface.
In this manual, the scanner ASSY is referred to as scanner ASSY.
The scanner ASSY mainly consists of the following parts:
Print head cartridge ASSY
Print head cartridge ASSY carries out a series of operation in the print process such as
charging, developing and transfer.
Print head cartridge ASSY mainly consists of the following parts.
Chute REGI (REGI clutch)
The chute REGI is composed of the REGI clutch, REGI roll and metal roll.
Drive from the main drive ASSY is transmitted to the REGI roll through the REGI
clutch. Feeds paper from the tray, MSI and duplex path in the print head cartridge
ASSY direction. When the paper tip reaches the chute REGI, the chute REGI has the
paper make a loop until the REGI roll starts rotating and correct the skew (feeding the
paper in inclined condition) of the tip of the paper.
Sensor photo (REGI sensor)
Detects that the paper tip has reached the chute REGI.
(Paper present: Beam is received)
OHP sensor ASSY
As plain paper scatters the radiated light, the OHP sensor ASSY can capture the
reflected light to detect the paper. The OHP paper scarcely scatters the radiated light,
and therefore the OHP sensor ASSY cannot capture the reflected light. Thus, whether
the paper fed from MSI is plain paper or OHP paper is judged.
LD ASSY
Scanner ASSY
SOS PWB
Drum (Y)
Drum (M)
Drum (C)
Drum (K)
HTC (Y)
HTC (M)
HTC (C)
HTC (K)
IDT 1 (2)
IDT 1 cleaner (2)
III-35
Lens
Mirror
Window
Developer (Y)
Developer (M)
Developer (C)
Developer (K)
Refresher (Y)
Refresher (M)
Refresher (C)
Refresher (K)
IDT 2
IDT 2 Cleaner