Service manual

FO-4700U
FO-47UC
1
2 6
4
3
5
BDEFG
I
HCA
BDEFG
I
HCA
1
2
6
4
3
5
64 78 79 82 73 95 96 56 57 58 59 60
8 9
10 11 12 13 14 15 54 55 53 52 70 71 67 65
22
97
92
89
81
80
77
66
16
7
6
50
23
62
72
91
93
94
76
75
61
12
R276 10K
R277 10K
R288 10K
R274 10K
R275 10K
MA5 R337 10
R338 10 R339 10 R340 10 R341 10
MA4 MA3 MA2 MA1
R280 10 R281 10 R282 10 R283 10 R284 10
MD15 MD14 MD13 MD12 MD11 MD10 MD9 MD8
R332 10 R331 10 R333 10 R334 10
5
4
3
2
1
100
63
38
39
40
36
85
25
83
26
74
84
86
90
68
69
12
46 17 21 30 43 47 35 87 98 37 45 49 18 48 41 42 51 44 88 34 99 24 19 20 27 28 29 31 32 33
C256 0.1
TP19 TP18
MA[21:0]
MD[15:0]
/MDMCS /MRD /MWRH /MDMINT /MDMRST
R285 10 R286 10 R287 10
+5V
R273 10K
TP13
TP14
TP15
TP16 TP17
C255
N.M.
DG
DG DGDGDG
R336
47K
C253
2200P
R270
0
C254
N.M.
MAG
+5V
TP22
TP23
TP24
TP25
DG DG
C213 10P
C218 10P
R343
10
R345
10
R346
10K
R271 390
R272
100
X4
38.00053MHz
C259 1
C6 22/25
MAG
R347
20
R279
0
+5V
DG DG MAG
R278
0
SIGRX
AGD
SIGTX
MAG
C257 390P
C258
0.1
C5 10/25
R342
47.5K
TP20 TP21
+5V +5V
L102
0
C217
N.M.
C216
1
C215
1
C219
1
C214
N.M.
DG
MAG
R335
0
+5V
12
L105
0
IC24
R144AFXL
14400bps FAX MODEM
RTS
GP13
+5VA
XTLO
CTS TXD DCLK DCLKI RXD RLSD RS4 RS3 RS2 RS1 RS0 D7 D6 D5 D4 D3 D2 D1 D0 CS READ
WRITE
IRQ XCLK(12M) YCLK(6M) PORI EN85
0VA 0VA 0VA 0VA 0VA
ADOUT
ADIN
RCVO
RCVI RXIN
AOUT
RAMPIN
ADG
NC NC NC
TXOUT
DAOUT
DAIN
SWGAINO
SWGAINI
NC NC NC NC NC NC NC NC
XTLI
EYEY
EYEX
EYECLKX
SYNCIN2
SYNCIN1
EYESYNC
ECLKIN1
EYECLK
BYPASS
TXLOSS1
TXLOSS2
TXLOSS3
GP11
GP02
GP03
GP04
GP05
GP06
GP07
GP16
GP17
GP19
GP20
GP21
+5VD1
+5VD1
0VD1
0VD1
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
0VD2
+5VD2
(1-6H) (1-6H)
(6-4G)
(1-2D) (1-1D)
(6-4G) (6-4G)
(4-5A) (4-3A) (4-3A)
Modem block 1 3/16
6 – 3