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The output current value of IC101 is changed by the control signal at pins 25 and 26 of IC112 (CPU) and
the torque of the stepping motor is selected.
Pin 25 of IC112
Normal
H
Power up
L
Power down
H
13
7
12
IC101
SLA7024M
CN011 6PIN
8
A
1
CN011 5PIN
A
18
CN011 4PIN
B
CN011 3PIN
11
B
B
16
5V
R105
4.7k
R104
4.7k
R103
4.7k
R102
4.7k
UP-D2600/V1(E)
Pin 26 of IC112
Output current value
L
530 mA
L
840 mA
H
270 mA
2
9
R135
3
470
TP127
Q101
R121
2.2k
2SC1623-T1-L5L6
14
REF
R136
82
10
R134
100
-3
4
15
B
A
A
17
5
6
IC104(1/8)
SN74HC245ANS-E05
17
3
IC104(2/8)
SN74HC245ANS-E05
16
4
15
Q103
2SB798-T1DK
R159
330
3
4
5
6
2
5V
7
10
PWUP OUT
TP136
PWDW
TP135
CL1074
R147
1k
CL1077
CL1076
IC104(3/8)
SN74HC245ANS-E05
5
CL1075
IC104(4/8)
SN74HC245ANS-E05
14
6
CL1078
IC114(1/3)
SN74HC74ANS-E05
4
5V
5V
SD
5
2
R160
Q
D
4.7k
3
R162
1k
6
Q
RD
5V
1
9
16
LD
VCC
14
A
QA
13
B
QB
8
12
C
QC
11
D
QD
9
IC113(4/6)
SN74HC14ANS-E05
15
EN1
CO
EN2
PWUP IN
RD
GND
IC111
TP158
SN74HC161ANS-E05
1
8
PWUP IN
TP158
CL1079
A
nA
B
nB
TP141
TP151
TP140
TP142
IC112 25PIN
CN112 26PIN
IC112 21PIN
IC112 22PIN
IC112 23PIN
IC112 24PIN
4-9
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