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AR-FN3
13. 10V power generating circuit
The 10V power generating circuit generates +10V which is supplied to
the power supply of the transport motor IC uPD1246C (IC13) and
comparator BA10393F (IC104). The circuit consists of a Zener diode
RD11EB (ZD7), transistor 2SC1472 (Q5), other peripheral resistan-
ces and capacitors. +24V is reduced to about +11V by the Zener
diode ZD7 and passed through the emitter follower circuit of the
transistor Q5 to become about +10V for outputting.
14. Transport motor drive circuit
The transport motor drive circuit consists of a motor IC yP1246C
(IC10), transistor array TD62503F (IC16), motor driver IC SLA6023
(IC20) and peripheral circuits.
When the transport motor control signal (FMPWM) from the CPU
becomes L level, the transistor inside the IC20 turns on to let the
motor current flow to start the motor. When the motor is started, the
transport motor hole signal (HU, HV, HW) input to the IC10 is
changed over to switch over the drive of the transistor inside the IC20
so that the motor begins to rotate under non-controlled state.
97
PA4
FMPWM/
99
PA6
FMRE
100
PA7
FMDIR
CPU
(IC03)
+5V
BR10
2.2K
2 3 4
+10V
C168
0.1U
R172
R171
R170
8/19/1999
+10V
+5V
+5V
BR2-8
R174
R164
IC103
IC106
4.7K
10K
10K
12
7
10
5
TD62503F
TD62503F
+5V
IC106
4
13
R169
2.2K
TD62503F
IC106
R173
5
12
2.2K
TD62503F
IC106
6
11
TD62503F
3
IC10
11
1
OUT1
IN1
12
RN108
10K
2
OUT3
IN2
13
RN108
10K
4
OUT5
IN3
14
RN108
10K
3
OUT6
IN4
680
15
R183
5
OUT4
IN5
16
R182
680
6
OUT2
IN6
R181
680
7
8
REVERSE
VCC
9
10
VREF
GND
UPC1246C
HW
1.2K
HV
Transport motor
1.2K
HU
hall signal
1.2K
C165 C166 C167
1000P
3
Supplied from
the copir
R27
+24V
1K(1/4W)
R28
1K(1/4W)
ZD07
RD11EB
As the transport motor rotates, the speed signal (FMRE) is output
from the motor. The CPU incorporates the signal. It reduces the ON
duty of the FMPWM signal to increase the speed when the motor
speed is slow; it increases the ON duty of the FMPWM signal to
reduce the speed when the motor speed is high. The motor speed is
thus maintained at a constant speed.
As the current flowing into the motor becomes large, the current
flowing to the R25 also becomes large, thus raising the voltage at the
negative side of the comparator BA10393F (IC15). When this voltage
becomes greater than the reference voltage (about 1.1V) preset at
the plus side, the output of IC15 becomes at L level, thus turning off
the IC20 transistor to restrict the current flowing to the motor (current
limit setting: about 5A).
+5V
R109
R112
2.4K
FMRE
10K
C116
1000P
1K
3
4 3 2 BR12
IC106
R177
1
16
2.2K
TD62503F
IC106
R178
2
15
IC15
2.2K
TD62503F
2
IA1
IC106
R179
8
3
14
IB1
2.2K
9
TD62503F
IC1
5
1
Vcc
GND
12
GND
BR13
3
OA
1K
3
7
OB
4 3 2
11
10
IC2
OC
6
IB2
4
IA2
SLA6023
C184
C183
C182
+5V
0.1U
3
R163
2.4K
R180
200
R162
R29
C162
360
0.22
0.1U
(1W)
9 – 11
R26
100(1/4W)
(Fuse resistor)
Q05
2SC1472K
C177
ZD08
C181
C10
0.1U
0.1U
RD18FB1
47U/35V
Transport motor
Speed signal
+24V3
C11
100U/35V
FM
U V W
D10
D09
D11
1SR124-400
3
IC104
5
7
+
6
-
BA10393F
C161
0.1U
+10V
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