Panasonic KX-FP81BX Service Manual page 141

6.4.5. STEPPING MOTOR DRIVE CIRCUIT
1. Function
The stepping motor works for both transmission and reception.
2. Motor
During motor driving, pin 131 of ASIC IC501 becomes a high level, and Q503, Q502 turns ON. As a result, +24V is supplied
to the motor coil.
Stepping pulses are output from ASIC IC501 pins, 125, 128~130, causing driver IC508 pins, 15~12 to drive the 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.
Function
Copy
Paper Feed
Stand-by
Stepping Motor Drive Mode
Mode
Standard or Fine 1-2
Super Fine 1-2
——— 1-2
——— All phases are
currently off.
141
Phase Pattern Speed
432 pps (t=1/432)
216 pps (t=1/216)
432 pps (t=1/432)
None
KX-FP81BX / KX-FP81CX / KX-FP82CX