AR-155 (serv.man8). AR150 155 ARF151 Service Manual-Operational Descriptions - Sharp Copying Equipment Service Manual (repair manual). Page 4

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.

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

General block diagram (cross section)

Top view

(1) Heat roller
A pressure 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-F151

6  –  3