Read Sharp AR-FN3 (serv.man2) Service Manual online
11. Elevator motor drive circuit
The elevator motor control signal (EMA, B) from the expansion I/O is
inputted through the driver TD62503F (IC103) to the H driver
STA457C (IC5), to drive the elevator motor which adjusts the tray
height according to the paper volume stored in the off-set tray (tray
3). EMA,B signal logic controls the rotational direction of the motor
(CW/CCW) to move up and down the tray.
inputted through the driver TD62503F (IC103) to the H driver
STA457C (IC5), to drive the elevator motor which adjusts the tray
height according to the paper volume stored in the off-set tray (tray
3). EMA,B signal logic controls the rotational direction of the motor
(CW/CCW) to move up and down the tray.
The motor is braked to improve the stopping accuracy of the tray.
TD62503 (IC103) is a driver for driving STA457C, consists of
peripheral resistors, capacitors, and diodes, which forms a delay cir-
cuit to prevent short electric current from flowing inside the H driver
when EMA and B are changed over.
peripheral resistors, capacitors, and diodes, which forms a delay cir-
cuit to prevent short electric current from flowing inside the H driver
when EMA and B are changed over.
To protect the circuit from shorting and motor locking, a protective
fuse (F3) is installed.
fuse (F3) is installed.
EMB
EMA
Rotational
direction
Working direction
0
0
Brake
Brake
0
1
CW
Elevation
1
0
CCW
Descent
1
1
Stop
Stop
12. Off-set motor drive circuit
The off-set motor control signal (OFMA,B) from the CPU is input to
the H driver TA7291S (IC2), to drive the off-set motor which moves
the tray sideways against the paper discharge direction, in order to
sort the sheets discharged to the off-set tray (tray 3) by the number of
sheets specified.
the H driver TA7291S (IC2), to drive the off-set motor which moves
the tray sideways against the paper discharge direction, in order to
sort the sheets discharged to the off-set tray (tray 3) by the number of
sheets specified.
The rotational direction of the motor is crank controlled in one direc-
tion (CW) and braked to a stop at the off-set home position.
tion (CW) and braked to a stop at the off-set home position.
To protect the circuit from shorting and motor locking, a protective
fuse (F1) is installed.
fuse (F1) is installed.
OFMB
OFMA
Rotational
direction
Working direction
0
0
Stop
Stop
0
1
CCW
Not used
1
0
CW
Off-set operation
1
1
Brake
Brake
9
4
8
F03
1.15A/125V
T1.0A/250V
T1.0A/250V
+24V3
1
6
8
4
9
STA457C
IC5
6
1
3
3
2
7
7
5
5
10
10
EVM+
EVM-
EVM
D02 D01
1SR124-400
2
I/O
(IC11)
PE0
PE1
4 EMA
5 EMB
TD62503F
TD62503F
TD62503F
TD62503F
+5V
R150
R149
R147
R148
D06
D05
RN105
10K
10K
200
200
1K
1K
1SS133
1SS133
C149
10000P
C150
10000P
1
16
2
15
3
14
4
13
IC103
IC103
IC103
IC103
+5V
R161
R160
1K
C159
68000P
C160
68000P
R14
R13
2.4K(1/4W)
2.4K(1/4W)
1K
2
RN105
Vcc
IN1
IN2
GND
VS
VREF
OUT1
OUT2
TA7291S
IC02
2
9
1
5
3
7
8
6
CPU
(IC03)
P44
P45
23 OFMA
24 OFMB
R128
R127
47K
47K
+5V
F01
0.315A/125V
T0.2A/250V
C03
10U/35V
OFM+
OFM-
OFM
+24V3
AR-FN3
9 – 10
8/19/1999
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