Citizen CTB-300 - Section15 Appendix; Schematic (Main)

CTB serial bench scale service manual
23
SECTION15 APPENDIX
15.1 SCHEMATIC (main)
AST2
4.9152
VCCE+
AC10
0.022UF
AC12
0.022UF
AR8
10K
AR6
10K
AC11
0.022UF
S+
AR7
10K
AR5
10K
AC13
0.022UF
S-
AC9
10K
AR2
104
AR1
10K
E+
A1N2+
20
VREF+
18
VREF-
17
C1
3
C2
4
A1N1+
1
A1N1-
2
A1N2-
19
VA+
5
VD+
15
OSC2
9
OSC1
10
CS
14
SDI
13
SDO
12
SCLK
11
A0
7
A1
8
VA-
6
DGND
16
AU1
CS5532
1
2
3
4
POWER
1
2
3
4
BR1
C5
25V/470UF
VAC
VB
VAC
R7
3K
R6
3.9K
NC
1
CL
2
CS
3
INI
4
NC
14
COMP
13
V+
12
VC
11
VOUT
10
VZ
9
NC
8
V-
7
VREF
6
N.I.
5
U5
LM723CN
T2
TIP31C
R3
100K
C10
201
R4
10K
R8
10
R5
10K
D1
VCH
VB
VAC
1
2
3
4
5
LOADCELL
S-
S+
GND
E-
E+
D2
IN4736
R9
10K
T3
9014
R10
10K
R11
100K
T5
9015
R14
100K
R12
1K
T4
9015
R13
1K
VAC
VCH
G
R
LED
T7
8550
R21
5.1K
T6
9014
AC12
100UF/25V
VOUT
3
VIN
1
GND
2
T10
LM2931
VOUT
3
VIN
1
GND
2
T8
LM2931
C18
470UF/25V
AC4
470UF/25V
C17
104
DVCC
AVCC
R18
1.5K
R17
20K
KEY
R20
5.1K
R16
2K
R19
3.9K
VB
RST
CHECK
VGND
AC14
6.8UF/25V
AC6
6.8UF/25V
AC8
100UF/25V
CS
SDI
SDO
SCLK
R23
2K
T9
9014
BL
T8
C13
0.047uf
R22
3K
R23
100
C14
6.8uf/16v
TR1
OUT
GND
43
2 1
EL1
VCC
EL2