Read Sharp AR-FN1 (serv.man10) Service Manual online
13. 10V power generating circuit
The 10V power generating circuit generates
+
10V which is supplied
to the power supply of the transfer motor IC uPD1246C (IC10) and
comparator BA10393F (IC15). The circuit consists of a Zener diode
RD11EB (ZD7), transistor 2SC1472 (Q5), other peripheral resis-
tances and capacitors.
comparator BA10393F (IC15). The circuit consists of a Zener diode
RD11EB (ZD7), transistor 2SC1472 (Q5), other peripheral resis-
tances 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
transistor Q5 to become about
+
10V for outputting.
14. Transfer motor drive circuit
The transfer motor drive circuit consists of a motor IC yP1246C
(IC10), transistor array TD62503F (IC16), motor driver IC SLA6023
(IC20) and peripheral circuits.
(IC10), transistor array TD62503F (IC16), motor driver IC SLA6023
(IC20) and peripheral circuits.
When the transfer motor control signal (FMPWM) from the CPU be-
comes at 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
transfer 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.
comes at 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
transfer 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.
As the transfer 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 main-
tained 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 refer-
ence 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).
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 main-
tained 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 refer-
ence 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).
+24V
R22
1K(1/4W)
1K(1/4W)
R24
1K(1/4W)
R23
100(1/4W)
100(1/4W)
ZD07
RD11EB
C169
0.1U
0.1U
0.1U
C168
C10
47U/35V
ZD01
RD18FB1
Q05
2SC1472
+10V
CPU
PA4
PA7
(IC02)
TD62503F
IC13E
TD62503F
IC16G
IC20
SLA6023
IA1
IB1
IC2
IB2
IA2
GND
Vcc
GND
OA
OB
OC
IC1
3
7
10
D19
TD62503F
IC16A
TD62503F
IC16D
TD62503F
IC16B
TD62503F
IC16C
TD62503F
IC16F
TD62503F
IC16E
BR13
1Kx3
R186
680
680
680
R185
R184
R174
R173
R172
10K
10K
10K
IC10
IN1
IN2
IN3
IN4
IN5
VCC
IN6
VREF
UPC1246C
OUT1
OUT3
OUT5
OUT6
OUT4
OUT2
REVERSE
GND
C163
0.1U
0.1U
C164
0.1U
+5V
5
6
R194
680
R187
2.4K
2.4K
R195
200
R25
0.22
(1W)
2 3 4
4 3 2 BR15
1Kx3
+24V
U V W
1
2
8
9
5
12
11
6
4
D20
D21
1SR124-400
x3
+
-
BA10393F
7
IC15B
C160
C161
C162
0.1Ux3
+10V
+5V
R196
10K
10K
R171
4.7K
4.7K
+5V
+5V
2 3 4
BR11
2.2Kx3
2.2Kx3
+10V
R168
R169
1.2K
1.2K
1.2K
C151
C150
C149
1000Px3
C09
100U/35V
HW
HV
HU
97
99
FMDIR
FMPWM/
5
12
7
10
R193
2.2K
2.2K
2.2K
R192
R191
11
12
13
14
15
16
7
9
10
6
5
3
4
2
1
8
C148
0.1U
0.1U
R160
2.2K
2.2K
R167
2.2K
2.2K
R170
4
5
6
11
12
13
1
2
3
16
15
14
PA6
100
FMRE
R138
10K
R137
2.4K
2.4K
C130
1000P
FMRE
+5V
+5V
BR2-8
10K
FM
Transfer motor
speed signal
speed signal
Transfer motor
haul signal
haul signal
(1-point earth)
9 – 11
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