Panasonic KX-F1200 Service Manual And Technical Manual page 107

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J-_. ,._1 I-PPING MOTOR DRIVE CIRCUIT
1) Function
Two individual stepping motors are used for transmission and reception. They feed document or recording paper synchro-
nized for reading or printing.
9) TX Motor
During motor drive, gate array IC404 pin 27 becomes high level, driver IC406 pin 14 becomes low level, and Q403 go ON as
a result, +24 V is supplied to the motor coil.
Stepping pulses are output form gate array IC404 pins, 23~26, causing driver IC406 pins, 10-13 drives TX Motor Coil. The
motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation. Rotation of 1-step feeds 0.13mm
of recording paper or document paper.
Timing chart is below.
TM0
TM1
TM2
TM3
Stepping Motor Timing Chart
• 2-2 Phase • 1-2 Phase
1/217 (sec)
r
1/217 (sec)
Stepping Motor Drive Mode
Function Mode Phase Pattern
Copy Fine 1-2
FAX Standard 2-2
Fine or 1-2
Half tone
2-2
Paper Feed
Stand-by All phase current
off.
Speed
217 pps
217 pps (MAX.)
217 pps (MAX.)
217 pps
Stopped
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