8
7
6
5
4
3
2
1
A
B
C
D
1
2
3
4
5
6
7
8
D
C
B
A
C238
33
0pF
RS232
C2
39
100pF
/C
I1
4
6
5
IC
2
1
B
75
189
1
3
2
IC
2
1
A
75
189
C236
330pF
FB
119
BLM3
1
FB
124
BL
M
3
1
VCC
-12V
C2
37
1
00p
F
/D
C
D
1
1
2
3
JP
6
1
2
3
JP
5
/C
S
1
D
B
[0
..
7
]
DB0
DB
1
DB
2
DB3
DB
4
DB5
DB
6
DB
7
CL
O
C
K
33
RST
34
DS
R
1
35
RT
S
1
36
DT
R
1
37
TR
N
C
LK
1
5
VCC
40
GN
D
47
RCVCLK
1
39
W
6
CS1
7
RCVRDY
1
10
SYNC/
BRK1
29
CT
S1
30
T
RNE
M
P
1
31
T
R
N
RDY
1
28
DB
0
41
DB1
42
DB
2
44
DB3
45
DB4
1
DB
5
2
DB6
3
DB7
4
CS2
12
R
9
RS
LC
T
0
8
RS
LC
T
1
11
NC
14
NC
24
NC
38
NC
48
O
PEN
19
OP
E
N
43
T
RNDT
1
32
RCVDT
1
46
TR
N
D
T2
22
DT
R
2
26
RT
S2
25
RCV
DT
2
13
CT
S2
20
DS
R
2
23
TR
N
C
LK
2
15
RCVCLK
2
27
T
RNR
DY2
17
RCVRDY
2
16
T
R
NE
M
P
2
21
SY
N
C
/B
R
K
2
18
IC20
M
B
89371
A
C228
100pF
C1
8
4
10
0p
F
C1
9
0
100pF
/R
T
S
1
/C
T
S
1
/DTR1
/R
T
S
1
TX
D1
R
C
VDT1
RCV
DT
1
+
12V
/C
T
S
1
14
15
12
13
10
11
8
1
16
3
2
5
4
7
6
9
IC
2
2
M
C
14
5
406
FB
1
2
1
BL
M
3
1
FB
126
BL
M
3
1
FB
1
2
3
BL
M
3
1
FB
122
BLM3
1
FB
1
2
0
BLM3
1
FB
1
2
5
BLM3
1
GN
D
CI
1
ER
1
CS1
SD1
RS
1
RD
1
DR
1
5
9
4
8
3
7
2
6
1
CO
N
7
DS
UB
C
O
N
(9
P
)
CD
1
GN
D
CI
2
5
9
4
8
3
7
2
6
1
CO
N
6
DSUB CO
N(
9
P
)
FB
114
BLM3
1
FB
116
BL
M
3
1
FB
1
1
1
BL
M
3
1
14
15
12
13
10
11
8
1
16
3
2
5
4
7
6
9
IC14
M
C
145
40
6
/D
S
R
1
TXD
2
R
C
VDT2
RCVDT
2
C189
10
0pF
C227
1
00p
F
C185
10
0pF
TR
NRD
Y
1
RCVR
D
Y1
T
R
NE
M
P
1
BRK
1
/C
S
2
/WRH
/R
D
H
AH
0
AH1
RES_
USAR
T
CLK_USAR
T
VC
C
C246
0.
1
u
F
C1
5
10u
F
/16V
VC
C
TR
NRD
Y
2
RCVRDY
2
T
R
NE
M
P
2
BRK
2
/R
T
S
2
/C
T
S
2
/DTR2
/DSR2
/R
T
S
2
/C
T
S
2
FB
112
BL
M
3
1
FB
115
BLM3
1
FB
117
BL
M
3
1
ER
2
CS2
SD2
RS2
RD
2
DR
2
CD
2
FB
113
BL
M
3
1
FB
1
1
8
BL
M
3
1
10
8
9
IC
2
1
C
75
189
13
11
1
2
IC
21D
75
18
9
C2
0
4
3
30p
F
C201
33
0pF
C2
05
1
00p
F
/C
I2
1
996/1
0/31
P
O
R
T
TY
PE C
H
A
NGED
/CI1,/CTS1,/DC
D
1,TRNR
D
Y
1
,R
C
VDT1
,R
C
V
RD
Y1,TRNEM
P
1
,BRK1
/C
I2
,/
C
T
S
2
,/
D
C
D
2
,T
RNR
DY2
,R
C
V
D
T
2
,RCV
RDY2
,T
RNEM
P
2
,BRK2
C2
02
1
00p
F
/D
CD2
1/
1
Summary of Contents for ER-A750
Page 3: ......
Page 8: ...CHAPTER2 OPTIONS 1 System configuration 2 1 ...
Page 32: ...7 2 2 Description of main LSI s 2 1 CPU HD6415108FX ...
Page 66: ...CHAPTER 8 PWB LAYOUT 1 Main PWB Side A 8 1 ...
Page 67: ...2 Main PWB Side B 8 2 ...
Page 68: ...3 Mother PWB Side A 4 CKDC PWB 8 3 ...
Page 69: ...5 Rear display PWB 6 Invator PWB 7 Noise filter PWB 8 4 ...