Table of Contents
Advertisement
KX-F910BX
4-4. STEPPING MOTOR DRIVE CIRCUIT
(1) Function
Two individual stepping motors are used for transmission and reception. They feed document or recording paper
synchronized for reading or printing.
(2) Circuit Operation
During motor drive, gate array IC1 pin 77/pin 71 becomes high level, Q2/Q4 are turned ON, and Q1/Q3 go ON as a result,
+24 V is supplied to the motor coil.
Stepping pulses are output form gate array IC1, causing driver IC7/IC8 to go ON. The motor coil is energized sequentially in
2 phase increments, which causes a 1-step rotation. Rotation of 1-step 0.13mm of recording paper or document paper.
Timing chart is below.
Timing Chart
TM0 (RM0)
TM1 (RM1)
TM2 (RM2)
TM3 (RM3)
Circuit Diagram
GATE ARRAY
(IC1)
TXE
77
(RXE)
(71)
73
4
TM0
(67)
(4)
(RMO)
74
5
TM1
(68)
(5)
(RM1)
75
6
TM2
(69)
(6)
(RM2)
76
7
TM3
(70)
(7)
(RM3)
When the motor is OFF, gate array IC1 pin 77/pin 71 becomes low level and Q2/Q4 are turn OFF. This causes Q1/Q3 to
also go OFF and inserted of +24V, +5V is supplied through D1/D2 so that the motor is held in place.
+24V
R43
(R45)
(Q3)
R44
(R46)
Q2
(Q4)
IC7(IC8)
D3
9
(D4)
13
(13)
12
(12)
11
(11)
10
(10)
|142 |
Stepping Motor Phase Pattern
Function
Mode
Copy
STD
Fine/Half Tone
Super Fine
FAX
STD
Fine/Half Tone
Super Fine
Paper Feed
1-2. Phase (Asic TM0-TM3, RM0-RM3 output)
Phase 0
Phase 1
+5V
Phase 2
Phase 3
D1
Q1
(D2)
max.
/
3
(sec)
1
4
4
CN9
(CN10)
4
(RECEPTION)
5
TRANSMISSION
MOTOR
3
2
1
Drive Phase
Speed
Pattern
1-2
434 pps
1-2
434 pps
1-2
217 pps
434 pps
1-2
1-2
434 pps
1-2
217 pps
1-2
217 pps
Advertisement
Table of Contents
