Panasonic KX-FP701LA Service Manual page 28

KX-FP701LA
6.4.5. Stepping Motor Drive Circuit (RX)
1. Function
The stepping motor works for reception and copy.
2. Motor
During motor driving, pin 124 of ASIC IC1 becomes high level, IC401 10pin becomes low level, and Q401 turns ON. As a
result, +24V is supplied to the motor coil.
Stepping pulses are output from ASIC IC1 pins, 124, 120~123, causing driver IC401 pins, 16~13 to drive the Motor Coil. The
motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation.
The timing chart is below.
Function
Copy
FAX Receiving
Paper Feed
Stand-by
Stepping Motor Drive Mode
Mode
Fine, Photo
Super Fine
Standard, Fine, Photo
Super Fine
———
———
Phase Pattern
1-2
1-2
1-2
1-2
1-2
All phases are currently off.
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Speed
432 pps (t=1/432)
216 pps (t=1/216)
432 pps (t=1/432)
216 pps (t=1/216)
432 pps (t=1/432)
None