Panasonic KX-FC971CX-S Service Manual page 143

8.4.6.2. 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.
8.4.6.2.1. TX Mode
Swing Gear A engages Gear TX and conveys its drive power to the Separation Roller Gear for pre-feeding documents.
8.4.6.2.2. RX Mode
Swing Gear B engages RX and conveys its drive power to the Platen Roller Gear for printing the received data.
Fig. B: TX mode
Fig. C: RX mode
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KX-FC971CX-S / KX-FGA521CX-S