Read Sharp AR-651 (serv.man10) Service Manual online
AR-651/810 SCANNING SECTION 6 - 5
6. 3. 2. Two-phase motor drive circuit (fixed-current type)
The scanner motor is driven by the unipolar transistors as shown below. The current chopper method is
employed by the driver circuit to improve motor torque STK672-080 (IC4).
15
14
13
12
11
10
9
8
6
7
ENABLE
Mol
RESET
M3
CLOCK
CWB
M2
M1
Vcc2
Vref
A
A
B
B
BB
PG
SUB
5
4
3
2
1
Excitation
mode setting
Switching pulse
ON/OFF detection
Excitation
status monitor
CR oscillation
Phase
counter
Generation of
reference clock
PWM control
Generation of phase
excitation signal
Generation
of pseudo
sine wave
Switching
current
fraction ratio
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