Service manual

FO-4700U
FO-47UC
1
2 6
4
3
5
BDEFG
I
HCA
BDEFG
I
HCA
1
2
6
4
3
5
–
+
–
+
–
+
–
+
+ –
0 1
5 3
4
TXMUTE
+5V
3 2
1
4
11
5 6
7
4
11
10
9
8
4
11
K A
0
1
14
13 12
0 1
2 1
15
CB
CB
CB
VDD
INH
VEE VSS
4
C9
47/16
DG
R365
100K
C269
330P
R360
160K
C7
4.7/50
C8
1/50
R251
20K
C223
4700P
R297
1K
BZOUT
VOLA VOLB
VOLC
SPMUTE
SP–
SP+
VREF
SIGTX
R252
10K
R417
0
C224
0.1
DG
IC25A
HCF4053
C267
1
R293
10K
+5V
R354
17.4K(F)
R355
10K
C264
1
DG DG DG
+24VA
IC31A
NJM2902M
C263
680P
R352
3.3K
R430
0
R431
51K
R432
10K
+5V
C424
1
DG DG DG
IC31B
NJM2902M
+24VA
R433
51K
C425
330P
R434
3.3K
TXOUT
DG
DG
+24VA
IC31C
NJM2902M
R298
33K
R253
33K
+5V
DG
C225
1
VREF
DG
DG
+5V
6
16
7 8
IC25D
HCF4053
C22
0.1
+5V
GAINC
R299
10K
C261
1000P
R349
86.6K(F)
+24VA
R348
3K
D143
1SS365
+5V
SIGRX AGD
R350
0
DG
14
4
11
12 13
IC31D
NJM2902M
C260
0.1/50
11
IC25C
HCF4053
R292
68K
R290
68K
R291
0
R289
C220
0.1(K)
N.M.
TP27 TP26
EXTSIG
RXIN
R295
20K
10
IC25B
HCF4053
+5V
R294 10K
BZCONT
C222
0.1(K)
R367
10K
R368
470
R369
1K
R370
1K
R371
33K
DG
DG
DG
DG
Q103
DTC114EK
Q104
DTC114EK
Q105
DTC114EK
DG DG DG
+5V
R364
10K
+5V
2 3
5
6
17
8
IC33
NJM2113M
DGDG
R296
20K
C200
0.01
C270
0.1
R363
3K
9
E
E
E
(1-2A)
(3-3G)
(1-2A)
(3-4G) (3-4G)
(14-3C)
(14-4C)
(1-3A)
(14-4C)
(14-2A) (14-2A) (1-3A) (6-3G) (6-3G) (7-1E) (1-4A)
R351
86.6K
R387
0
DG
R386
3.3K
Modem block 2 4/16
6 – 4