Parts identification and functions
Mirror home position sensor
No. 2/3 mirror unit Reflector Copy lamp unit
Lens drive wire
Lens home position sensor
AE sensor | Lens No. 4/5 mirror unit |
| drive motor |
Copy lamp
Lens
Lens unit
Mirror motor
No. 4/5 mirror unit
Mirror base wire | Temperature fuse |
(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.
(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)
(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.
(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.
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