Optics - Ricoh FT4430 Service Manual

April '88
16

OPTICS

During the copy cycle, an image
surface via the optics assembly as
Light Path:
Exposure Lamp [A] --> Original [B] --> First Mirror [C] -->
Second Mirror [D] --> Third Mirror [E] -->
Fourth Mirror [G] --> Toner Shield Glass [H] --> Drum [1]
The cooling blower [J] circulates cool air into the optics cavity. The air flows
from the right to the left in the optics cavity and exhausts through the vents in
the top cover. This blower operates during every copy cycle.
This model has eight standard reproduction ratios: four reduction ratios, three
enlargement ratios, and full size. In addition, it has a zoom function. The user
can change the reproduction ratio in one percent steps from 65% to 155%.
Stepper motors are used to change the positions of the lens and mirrors.
Separate motors are used because of the wide range of reproduction ratios.
The scanner drive motor is a servomotor and is controlled by the optics CPU.
The scanner drive motor changes the scanner speed depending on the
reproduction ratio.
This copier has a special function: the 2 Single Copies mode, which makes
two single copies from a bound document.
of the original
follows.
Lens [F] -->
2-12
.