Read Sharp AR-FN1 (serv.man10) Service Manual online
15. Stepping motor drive circuit
The control signal (STMA,B) from the expansion I/O expansion is
input through the driver TD62503F to the H driver circuit which con-
sists of a large-current driving transistors Q1
input through the driver TD62503F to the H driver circuit which con-
sists of a large-current driving transistors Q1
∼
4, thus driving the
staple motor which staples sheets.
The rotational direction (CW, CCW) of the staple motor is controlled b
signal locks STMA, STMB. The motor is braked to stop at the home
position.
signal locks STMA, STMB. The motor is braked to stop at the home
position.
TD62503 (IC15) is a driver to drive Q1
∼
4. A delay circuit is com-
posed of R163-R166, R176, R177, C152, C153, C156, C157, D3,
and D4 to prevent short current from flowing into the H driver circuit
which is formed by Q1
and D4 to prevent short current from flowing into the H driver circuit
which is formed by Q1
∼
4, when STMA and STMB are changed
over.
The staple motor has a large rush current. It thus has a current limit
circuit consisting of a voltage comparator BA10393F (IC15) and pe-
ripheral resistances and capacitors, to apply current limit at about
5.3A. To prevent the circuit from shorting or motor locking, a protec-
tive fuse (F2) is installed.
circuit consisting of a voltage comparator BA10393F (IC15) and pe-
ripheral resistances and capacitors, to apply current limit at about
5.3A. To prevent the circuit from shorting or motor locking, a protec-
tive fuse (F2) is installed.
16. Stapler unit
The stapler unit (EH-524S: Max Co., Ltd.) staples up to 50 sheets of
80-g paper. The unit consists of a driving DC motor (STM), home
position sensor (STHP), non-needle sensor (LSTS), cartridge sensor
(NCTS), and self-priming sensor which detects the stapling position of
needles (READY).
80-g paper. The unit consists of a driving DC motor (STM), home
position sensor (STHP), non-needle sensor (LSTS), cartridge sensor
(NCTS), and self-priming sensor which detects the stapling position of
needles (READY).
Item
Specification
Outside dimensions
H
×
W
×
L: 97 mm
×
80 mm
×
104 mm
Stapling capacity
52 g 2 sheets ~ 80 g 50 sheets, below 5
mm thick
mm thick
Stapling type
Bypass flat clinch
Stapling speed
400 msec or below
Needle cartridge
5000 needles
500
3K
2SB1431
Q04
150
5K
2SD1590
Q02
2.5A/125V
T1.6A/250V
T1.6A/250V
F02
+24V
I/O
PE4
PE5
8 STMA
9 STMB
+5V
R166
R165
R164
R163
D03
D04
R161
R162
4.7K
4.7K
200
200
1K
1K
1SS133
1SS133
(IC03)
TD62503F
TD62503F
3
14
4
13
IC09D
IC09C
R176
C157
68000P
1K
IC09B
IC09A
TD62503F
TD62503F
15
2
1
16
R16
R17
2.4K(1/4W)
2.4K(1/4W)
R177
C156
68000P
C152
10000P
C153
10000P
500
3K
2SB1431
Q03
150
5K
2SD1590
Q01
D01 D02
STM+
STM-
STM
1SR124-400•~2
1K
+5V
R190
+
-
100
C155
0.1U
0.1U
C154
0.1U
0.1U
R175
1.2K
1.2K
R18
0.22
(1W)
(1W)
R188
3.9K
3.9K
+5V
+10V
+5V
R189
2.2K
2.2K
BA10393F
C165
0.1U
0.1U
8
1
3
2
4
IC15A
5
12
11
6
TD62503F
TD62503F
IC09E
IC09F
STHP
STM
LSTS
NCTS
READY
+5V
GND
Finisher
main PWB
Stapler unit
9 – 12
