Panasonic KX-FT21RS - Manual (Page 116)

6.4.6.2. Mode Operation
Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode operation.
A: Transmit mode
Swing Gear A-1 engages G6 and conveys its drive power to the Separation Roller Gear for pre-feeding documents.
B: Receive mode
Swing Gear B engages G8 and conveys its drive power to the Platen Roller Gear for printing the received data.
C: Copy mode
Swing Gear A-1 and B engage Gears 6 and 8 respectively and drive both the Separation Roller Gear and the Platen Roller Gear
for feeding documents and recording paper in the copying operation.
6.4.6.3. Mechanical Movements in the Main Operations
6.4.6.3.1. Idle status
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KX-FT21RS