Panasonic KX-FM330GR Service Manual page 198

KX-FP320G / KX-FM330G
When the motor is stopped for a period (about 70~80 msec) during the receive mode, pin 163 of ASIC IC501 becomes a low
level and driver IC402 pin 13 becomes a high level. This causes Q402 to turn OFF, and instead of +24 V, +5 V is supplied
through D403 so that the motor is held in place. When the system is in the stand-by mode, all of the motor drive transistors are
OFF. Therefore the motor current is OFF.
3. RX Motor
During motor driving, pin 156 of ASIC IC501 becomes a high level, driver IC401 pin 14 becomes a low level, and Q401 turns
ON. As a result, +24V is supplied to the motor coil.
Stepping pulses are output from ASIC IC501 pins, 152~155, causing driver IC401 pins, 13~10 to drive the RX Motor Coil. The
motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation. A 1-step rotation feeds 0.13 mm of
recording paper or document paper. The timing chart is below.
156