Panasonic KX-FT981LA-B Service Manual page 143

15.2.2. Mode Operation
Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode opera-
tion.
15.2.2.1. TX Mode
Swing Gear A engages Gear TX and conveys its drive power to the Separation Roller Gear for pre-feeding documents.
15.2.2.2. RX Mode
Swing Gear B engages Gear 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-FT981LA-B / KX-FT987LA-B