BenQ 2720S Service Guide - Page 22

Transmission Module

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4.2 Transmission Module This module contains the stepping motor, which provides enough power and torque to drive the film/slide holder. Figure 4-4 Transmission Gear Diagram The gear transmission diagram is shown as above and gear numbers are also listed. The purpose of the gear transmission is to reduce the speed of the stepping motor. The transmission ratio is (110/15)*(92/15); pulley is of diameter 12.93mm; stepping angle of motor is 3.75 degree. Thus we could have 2700dpi resolution as calculated as above. 4-8 API Confidential Mechanism No Copy/Reproduction allowed

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4.2 Transmission Module
This module contains the stepping motor, which provides enough power
and torque to drive the film/slide holder.
Figure 4-4 Transmission Gear Diagram
The gear transmission diagram is shown as above and gear numbers are
also listed. The purpose of the gear transmission is to reduce the speed of
the stepping motor. The transmission ratio is (110/15)*(92/15); pulley is
of diameter 12.93mm; stepping angle of motor is 3.75 degree. Thus we
could have 2700dpi resolution as calculated as above.
4-8
API Confidential
Mechanism
No Copy/Reproduction allowed