Sharp AR-F152, Service Manual

Page: 32 / 170

No. Component Function
(1) Semiconductor laser Generates laser beams.
(2) Collimator lens
Converges laser beams in
parallel.
(3)
Polygon mirror,
polygon motor Reflects laser beams at a
constant rpm.
(4)
BD (Mirror, lens,
PWB) Detects start timing of laser
scanning.
(5) f
θ
lens
Converges laser beams at a
spot on the drum.
Makes the laser scanning
speeds at both ends of the
drum same as each other.
(Refer to the figure below.)
Makes the laser scanning speeds at both ends of the drum same as
each other.
B. Laser beam path
C. Composition
Effective scanning width: 216mm (max.)
Resolution: 600dpi
Beam diameter: 75um in the main scanning
direction, 80um in the sub scanning
direction
Image surface power:
0.20
±
0.03mW (Laser wavelength
780 – 795nm)
Polygon motor section:
Brushless motor 20.787rpm
No. of mirror surfaces: 6 surfaces
4. Fuser section
A. General description
General block diagram (cross section)
Top view
(1) Heat roller
A Teflon roller is used for the heat roller and a silicone rubber roller is
used for the lower heat roller for better toner fusing performance and
paper separation.
(2) Separator pawl
Three separator pawls are used on the upper heat roller. The separator
pawls are teflon coated to reduce friction with the roller and prevent a
smear on the paper caused by the separator pawl.
a
≠
b
≠
c
a b c
d = e = f
d e f
f
θ
LENS
Heat roller
Thermistor
Thermal fuse
Heater lamp
Separator pawl
Separator pawl
PPD2
Thermal fuse
Thermistor
Heat roller
Paper guide
Pressure roller
AR-F152
6 – 3