Read Sharp ER-A770 (serv.man4) Service Manual online
2. CKDC PWB
8
7
6
5
4
3
2
1
A
B
C
D
1
2
3
4
5
6
7
8
D
C
B
A
CKDC
-2
9V
-2
9V
R2
9
10
0K
X4
G
1
1
G
1
0
G
9
G
8
G
7
G
6
G
5
G
4
S
A
-2
9V
R5
8
R5
9
R6
2
R6
0
R6
1
R6
3
R6
4
R5
7
R6
5
10
0K
X9
R4
8
10
0K
R4
7
10
0K
X8
R4
6
R4
5
R4
4
R4
3
R4
2
R4
1
R4
0
/P
O
F
F
/S
T
O
P
/S
H
E
N
/I
RQ
/S
C
K
HTS
STH
/R
ESET
S
POPUP CON1
-2
9V
VCC
VCKDC
+2
4V
FB2
FB3
FB4
FB5
FB6
FB7
FB8
FB9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
CON4
M
L
X 5597-
1
8CPB
C2
10
u/1
6
V
C3
0.
1u
C6
47
0p
FB1
SB
SC
SD
SE
SF
SG
COM/AP
DP
ID
CKDCR
ST0
ST1
/C
FS
R
KEX0
KEX1
CKDC PWB
2
KEYI
F
.SCH
ST1
ST0
KEX1
KEX0
/C
FS
R
/K
R
[0
..3
]
ST3
ST2
C4
47
0p
C5
47
0p
C7
47
0p
VCC
PJ1
PJ
SB
1
SC
2
SD
3
SE
4
SF
5
SG
6
P4
7
P0
8
P1
9
P2
10
P3
11
MOD
R
12
CFSR
13
KEX0
14
KEX1
15
RQ
16
SKR0
17
ST0
18
ST1
19
S T 2
2 0
S T 3
2 1
P O F F
2 2
S T O P
2 3
D D I G
2 4
D C S
2 5
V C C
2 6
S C K
2 7
H T S
2 8
S T H
2 9
S D I S P
3 0
B U Z Z
3 1
D S C K
3 2
SRES
33
DS0
34
SHEN
35
IR
Q
36
KR0
37
KR1
38
KR2
39
KR3
40
RESET
41
OSC2
42
OSC1
43
GND
44
CL
1
45
CL
2
46
TEST
47
G0
48
G1
49
G2
50
G3
51
G 4
5 2
G 5
5 3
G 6
5 4
G 7
5 5
G 8
5 6
G 9
5 7
G 1 0
5 8
G 1 1
5 9
P O 0
6 0
P O 1
6 1
P O 2
6 2
P O 3
6 3
S A
6 4
IC
8
CKDC9
VCC
G0
G1
G2
G3
/I
RQ
/S
H
E
N
/R
ESET
S
/K
R
3
/K
R
2
/K
R
1
/K
R
0
CKDCR
R3
3
1M
X2
4.19M
H
z
X1
32
.76
8
KH
z
C8
15
p
C9
15
p
R3
2
R3
1
R3
0
D2
6
1SS353
23
1
Q1
DTC1
14
YK
VCC
/
P
O
F
F
/
S
T
O
P
/
S
C
K
H
T
S
S
T
H
VCC
C1
6
0.
1u
C1
1
10
00p
ST2
ST3
1
2
3
4
5
6
7
8
9
10
11
CON3
-2
9V
G3
G2
G1
G0
ID
DP
POPUP CON2
NOT USED BY
ER-
A
770
VFD P
O
W
E
R SUPPLY
VF2R
COM/AP
SF
SG
SE
SD
G6
G5
G4
SC
SB
SA
VF1R
VF2
VF1
-2
9V
R2
7
0
R3
4
0
*
IS
NO
T
U
S
E
D
.
VF1
VF2
-2
9V
1
2
3
4
5
6
7
8
9
CON5
BZ1
BUZ
VCC
C1
2
10
u/1
6
V
C1
10
u/1
0
V
OS
1/2
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