Service manual

FO-4400U
FO-CS1
20x2 Characters
FLIP-FLOPS FLIP-FLOPS
GND
14
5V
9
VO
12
RS
11
R/XW
10
E
13
LD0
8
LD1
7
LD2
6
LD3
5
LD4
4
LD5
3
LD6
2
LD7
1
GND
1
PLTSW
3
SEN7
5
SEN6
7
SEN5
9
SEN4
11
SEN3
13
SEN2
15
SEN1
17
SEN0
19
+5V
21
/BKLON
23
E
25
RS
27
GND
2
LEDEN1
4
LD5
6
LD4
8
LD3
10
LD2
12
LD1
14
LD0
16
LEDEN2
18
TH1
20
TH2(GND)
22
GND
24
LD7
26
LD6
28
VDD
16
CLR
1
6D
14
5D
13
4D
11
3D
6
2D
4
1D
3
6Q
15
5Q
12
4Q
10
3Q
7
2Q
5
1Q
2
GND
8
CLK
9
1
2
GND
3
LED7
13
LED8
11
LED9
9
LED10
7
LED11
5
LED3
14
LED1
4
LED2
6
LED4
12
LED6
10
LED5
8
5V
15
TH2
1
TH1
2
VDD
16
CLR
1
6D
14
5D
13
4D
11
3D
6
2D
4
1D
3
6Q
15
5Q
12
4Q
10
3Q
7
2Q
5
1Q
2
GND
8
CLK
9
C13 22u/16V
+
R13 2.4K
C7 2200P
CNCOG
LMG2025-TPR
CNPNA
B28B-PHDD
1 3 5 7 9 11 13 15 17 19 21 23 25 27
20 18 16 14 12 10 8 6 4 2 28 26 24 22
FB1 JUMPER
C12 0.1u
IC3
AHCT174
C10 0.1u
R16 100K
C5 33u/16V
+
C4
N.M.
+
R17 100K
R14 JUMPER
CNBKL
N.M.
C11 22u/16V
+
C8 220P
C9 2200P
C2 4.7u/25V
+
C1 33u/16V
+
CNLEDA
HLW15S-2C7
CNLED
IC2
AHCT174
R12 51
DGDG
DG
DG
DG
+5V
DG
+5V
DGDG
+5V
DG
DG
DG
DG
DG DG
DG
+5V
+5V
DG
+5V
+5V
LD2 1 LD4 LD7 LD1 1 LD5 LD6 LD0 1 LD3 1 RS E
LD0 1
LED2 LED3
LD1 1
LED7 LED4
LD2 1
LEDEN2
LED5
LD0 1
LED8
LD2 1 LD4
LED1
LD4 LD3 1
LEDEN1
LED6LD5 LED9 LED10
LD1 1 LD5 LD3 1
LD01 LD21
LD4 LD5 LD11 LD31
/SEN7 1 /SEN6 1 /SEN5 1 /SEN4 1 /SEN0 1 /SEN1 1 /SEN2 1 /SEN3 1 PLTSW 1 LEDEN1
LEDEN2
LED11
TH1 TH2
LED1 LED3 LED7 LED8 LED9 LED10 LED11 LED2 LED4 LED6 LED5
TH1 TH2
LD7 LD6
E RS
A A
B B
C C
D D
E E
F F
G G
H H
6 6 5 5 4 4 3 3 2 2 1 1
Operation Panel PWB circuit 2/3
Note: Since the parts of this PWB cannot be supplied, change it as a unit.
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