Stepping Motor Drive Circuit - Panasonic KX-FC265GR-T Service Manual

KX-FC265GR-T
6.4.5.

Stepping Motor Drive Circuit

1. Function
One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized
for reading or printing.
2. Circuit Operation
During motor driving, pin 124 of ASIC IC10 becomes a high level, and Q403, Q402 turns ON. As a result, +24V is supplied to
the motor coil.
Stepping pulses are output from ASIC IC10 pins, 120~123, causing driver IC401 pins, 11~14 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.
The timing chart is below.
Function
Copy
FAX Sending
FAX Receiving
Paper Feed
Document Feed
Stand-by
Stepping Motor Drive Mode
Mode
Fine, Photo
Super Fine
Standard
Fine, Photo
Super Fine
Standard, Fine, Photo
Super Fine
———
———
———
Phase Pattern
1-2
1-2
2-2
1-2
1-2
1-2
1-2
1-2
1-2
All phases are currently off.
26
Speed
432 pps (t=1/432)
216 pps (t=1/216)
432 pps (t=1/432)
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)
432 pps (t=1/432)
None