FO-780A
Analog signal block
6/6
6 – 6
1
2
6
4
3
5
BD
E
F
G
I
H
C
A
BD
E
F
G
I
H
C
A
1
2
6
4
3
5
–
+
–
+
–
+
–
+
12
14
13
TELOUT
CNLIUA-1
R217
86.6K
C181
680P
C178
1
IC11
4053
VREF
TXCONT
(1-1D)
0
1
8
9
10
IC12
2902
R200
13K
+5V
R218
3.3K
C198
1
+5V
16
7
8
IC11
4053
C176
0.1
SIGTX
(3-3H)
R197
1K
R193
R194
1K
C179
1
N.M.
R199
17.4K
R219
10K
C177
1
TXOUT
CNLIUA-10
SIGTX
(3-3H)
R203
86.6K
C183
1000P
7
6
5
IC12
2902
SIGRX
(3-3H)
+5V
D105
1SS355
R220
3K
MAG
AGD
(3-4H)
R140
0
C4
10/50
5
4
3
9
IC11
4053
0
1
GAINC
(1-1D)
RXIN
CNLIUA-9
R213
3.9K
R195
118K
R214
0
EXSIG
CNLIUB-1
C194
0
R198
47K
14
13
12
+24VA
R196
1.5K
C182
1
R177
47K
R201
10K
TELIN
CNLIUA-2
C180
1000P
C184
0.1
11
4
VREF
+5V
C160
0.1
R181
33K
IC12
2902
R180
33K
C161
1
1
15
2
10
IC11
4053
1
R174
1K
C158
4700P
R166
100K
R168
1K
C159
0.01
R173
20K
R192
1K
R175
20K
R170
3K
C2
1/50
5
IC10
NJM2113
8
7
1
3
2
4
6
R167
30K
+5V
R171
100K
R172
220K
C157
220P
SP+
CNSP-1
SP–
CNSP-2
SPMUTE
(1-4A)
BZCONT
(1-1E)
VOLB
(3-1D)
VOLA
(3-6D)
BZOUT
(1-1E)
VCC
GND
VEE
ENABLE
6
11
R216
20K
R215
20K
R169
470
DG
DG
DG
C196
0.1
R176
0
DG
DG
DG
DG
RCVOL
(3-1D)
RCVOL
CNLIUB-6
C233
100P
R179
R178
DG
DG
N.M.
DG
DG
DG
DG
DG
DG
DG
DG
DG
DG
Q106
DG
C1
47/25
C156
0.1
0
Q105
RNC1402
Q104
RNC1402
Summary of Contents for FO-780A
Page 64: ...FO 780A Control PWB parts layout Top side 6 7 ...
Page 65: ...FO 780A Control PWB parts layout Bottom side 6 8 ...
Page 68: ...FO 780A 6 11 TEL LIU PWB parts layout Top side ...
Page 69: ...FO 780A TEL LIU PWB parts layout Bottom side 6 12 ...
Page 71: ...FO 780A Power supply PWB parts layout 6 14 ...
Page 101: ...FO 780A M E M O 18 ...