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(7) Lens drive shaft
This shaft controls the optical axis of the lens in zoom copy. The lens
follows along the slide base shaft.
(8) Lens drive wire
This is to shift the lens unit and the No. 4/5 mirror base.
(9) No. 4/5 mirror unit
No. 4/5 mirrors are attached to this unit. It is shifted by the lens drive
motor to change the distance between the original and the drum
according to the zooming ratio.
(10) Mirror motor
This stepping motor shifts the copy lamp unit and the No. 2/3 mirror
base. It is rotated at the rpm according to each zooming ratio.
(11) Mirror home position sensor (MHPS)
This sensor senses the home position of the copy lamp unit. It is of
light transmission type.
(12) No. 2/3 mirror unit
No. 2/3 mirrors are attached to this unit. It is scanned by the mirror
motor.
(13) Copy lamp unit
This is composed of No. 1 mirror, the temperature fuse, the copy
lamp, the exposure adjustment plate, and the reflector, and scanned
by the mirror motor.
(14) Temperature fuse
This is attached closely to the reflector to prevent against abnormal
temperature rise in the optical system. If the temperature rises abnor-
mally, it turns off the copy lamp power directly.
100V series (117°C)
200V series (117°C)
(15) Reflector
Light from the copy lamp is reflected by the reflector to the original.
(16) Exposure adjustment plate
Four exposure adjustment plates are attached to the copy lamp unit
to adjust exposure balance in back and forth direction of the frame.
(17) Mirror base drive wire
This wire transmits the mirror motor power to the copy lamp unit and
the No. 2/3 mirror base to scan the mirror base.
(18) Lens drive motor
This stepping motor drives the lens and the No. 4/5 mirror base.
(19) AE sensor
This AE sensor senses the original density by the light emitted from
the copy lamp and reflected by the original, controlling the developing
bias. The photometric area is about 100m width at the center and in
the mirror base scanning direction.
The element is photo diodes.
Parts identification and functions
Mirror home position sensor
No. 2/3 mirror unit
Copy lamp unit
Reflector
Copy lamp
AE sensor
Lens home position sensor
Lens No. 4/5 mirror unit
drive motor
Mirror motor
No. 4/5 mirror unit
Lens
Lens
unit
Mirror base wire Temperature fuse
Lens drive wire
5 – 5