KX-PX2CX - Panasonic Copying Equipment Service Manual (repair manual). Page 12

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Fig. 2-1 shows the sensor to detect the mechanism operation

This printer is equipped with two DC motors. (Fig. 2-2)

• The PS motor on the upper side, which is connected to the capstan roller, the pick-up roller, and the take-up reel by gear, feeds

recording paper and takes up the ink sheet. This motor, into which a worm gear integrated with evenly spaced slits is pressed,
achieves the constant-speed rotation at the time of recording by measuring the number of rotations with the transparent PS
motor sensor to control the power. 

• The M motor on the lower side switches the operation modes, such as raising and lowering of the head and the paper press-up

lever, and switching of each gear, by driving the cam gear and the cam plate. 
The position alignment of each operation mode is performed by determining the absolute position with the mode initialize switch
and by detecting the slits of the gear connected to the M motor with the mode sensor.