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FO-780A
Modem block
3/6
6 – 3
1
2
6
4
3
5
B
D
E
F
G
I
H
C
A
B
D
E
F
G
I
H
C
A
1
2
6
4
3
5
R120
270
C213
68P
R128
270
+5V
D7
A0
C125
0.01
R136
270
D6
D5
D4
D3
D2
D1
D0
A1
A2
A3
A4
56
57
58
59
60
RS4
RS3
RS2
RS1
RS0
8
D7
9
D6
10
D5
11
D4
12
D3
13
D2
14
D1
15
D0
54
CS
55
READ
53
WRITE
52
IRQ
70
XCLK(12M)
71
YCLK(6M)
64
RTS
78
CTS
79
DCLK
82
DCLKI
73
RXD
95
TXD
96
RLSD
67
PORI
65
EN85
DG
61
75
76
94
93
91
72
23
50
6
7
16
66
77
80
81
89
92
97
22
L102
HM601
C124
1
GP13
GP16
GP17
GP19
GP20
GP21
+5VD1
0VD1
0VD1
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
C218
0.1
+5VD2
+5V
L103
HM601
+5VA
0VA
0VA
0VA
0VA
0VA
46
ADOUT
ADIN
RCVO
RCVI
RAMPIN
AGD
SWGAIN0
SWGAIN1
N.C.
N.C.
N.C.
17
21
30
43
47
C149
0.1
35
87
98
37
45
49
18
48
42
44
88
99
24
19
27
29
31
32
C3
47/25
R155
3
+5V
R137
0
MAG
N.C.
33
SIGRX
5
4
3
2
1
100
63
38
39
40
85
25
83
26
74
84
86
90
68
GP07
GP06
GP05
GP04
GP03
GP02
GP11
TXLOSS2
TXLOSS1
EYECLK
ECLKIN1
EYESYNC
SYNCIN1
SYNCIN2
EYECLKX
EYEX
EYEY
XTLI
DPMUTE
RCVOL
VREFCONT
(5-5F)
(6-1I)
(5-1A)
(6-2E)
R141
1000P
MAG
X2
24.00014MHz
C113
15P
R126
120
C123
18P
R125
200
69
XTLO
IC6
R96DFXL-CID
N.C.
N.C.
N.C.
DG
(6-3A)
VOLB
LEDON
D[7~0]
RD
WR
(1-6I)
(1-3H)
(1-3I)
(1-3I)
DG
C114
R138
1000P
(6-1I)
DG
62
N.C.
VOLA
DG
C127
51
RXIN
41
DAIN 34
AOUT
N.C.
28
20
N.C.
N.C.
N.C.
DAOUT
TXOUT
MAG
C136
1
C126
390P
C135
0.1
R139
47.5K
AGD
(6-3A)
SIGTX
(6-5A)
36
BYBASS
DG
R121
270
CNLIUB-3
TXMUTE
MIRQ
(1-6F)
A[4~0]
(1-5I)
MDMRST
(1-5A)
MCS
MAG
R127
33K
TXLOSS3
(1-3A)
BYPASS
R113
10K
R112
270
DG
CNLIUB-5
C115
68P
DG
R230
0
C137
1
N.M.
C217
0.1
N.M.
PIN
PE
DRSNS
CISCHK
CSWI
CNLIUA-7
CNLIUA-6
(4-5D)
(5-4B)
(4-6D)
R117
R118
R114
30K
100K
39K
R115
39K
C191
68P
R192
68P
R111
270
RCVOL2
CNLIUB-2
C116
68P
C128
68P
RA1
270x4
(6-5E)
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 ...