Panasonic KX-FPC135 Service Manual page 169

7.4.6.2. Mode Operation
Once a mode is selected, the Drive Motor Gear rotates counterclockwise (CCW) and then the controlling positions of Swing Gears
A, B and C determine which gears convey their drive power in each mode.
A. Transmit mode (See Fig. A.) :
Swing Gear C engages G4 and conveys its power to the Separation Roller Gear through G3 and sets the Separation Roller for
feeding documents.
Fig. A: Transmit mode
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KX-FPC135 / KX-FPC141