Panasonic KX-FP362BX Service Manual

Stepping Motor Drive ModeFunction Mode Phase Pattern SpeedCopy Fine or photo 1-2 432 pps (t=1/432)Super Fine 1-2 216 pps (t=1/216)Paper Feed ——— 1-2 432 pps (t=1/432)Stand-by ——— All phases arecurrently off.None7.4.5. STEPPING MOTOR DRIVE CIRCUIT (TX)1. FunctionThe stepping motor works for transmission.2. MotorDuring motor driving, pin 131 of ASIC IC501 becomes a high level, and Q507, Q504 turns ON. As a result, +24V is suppliedto the motor coil.Stepping pulses are output from ASIC IC501 pins, 125, 128~130, causing driver IC510 pins, 16~13 to drive the Motor Coil. Themotor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation. A 1-step rotation feeds 0.13 mm ofdocument paper.The timing chart is below.The motor suspends while it is in the receive mode (about 70~80 msec), pin 131 of ASIC IC501 becomes a low level and Q507turns OFF. Then Q504 also turns OFF, and instead of +24 V, +5 V is supplied through D504 so that the motor is held in place.When the system is in the stand-by mode, all of the motor drive transistors turn OFF. Consequently, the motor current stops.135KX-FP362BX