Panasonic KX-FT21RS - Manual (Page 115)

6.4.6. GEAR SECTION
This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the
motor and copying.
6.4.6.1. Mode Selection
When the motor attached to the Drive Motor Gear rotates counterclockwise (CCW), Swing Gear A-2 engages the CAM and the
CAM turns counterclockwise to select a mode. (See Fig. A.) There are three mode options controlled by the Switch: A:
Transmitmode, B: Receive mode and C: Copy mode. In Fig. B, you can see which mode is selected by the position of the rib in
the CAM.
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KX-FT21RS