Service manual

UX-A255U
FAX Modem block 3/6
6 – 3
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
6 6
5 5
4 4
3 3
2 2
1 1
DG
DG
DG
DG
(6-1C)
(6-6E)
(6-2E)
(6-4E)
DG
THRANK
DPON
DG
PIN
RHS-
HS-
CI-
DTMFMUTE
SIGMUTE
DG
(6-3E)
CML
SPMUTE
RCVOL
TELMUTE
(6-1A)
(6-3E)
DG
(6-1I)
DPMUTE
DG DG
DG
(4-5C)
(4-4C)
(4-6C)
(5-5E)
(4-3C)
(5-3D)
FLRXD
FLTXD
DG
<CS5A>
CI-
SRLTX
SRLRX
PARK
VOL C
VOL B
LEDON
VTHON
FRSNS
ORGSNS
DR/RBN
CSWI
FCS
FRD
FWR
FCLE
FALE
READY
VOL A
(2-2G)
(2-2G)
(2-3G)
(2-3G)
(2-3G)
(2-2G)
(6-1G)
(6-1G)
(6-1G)
(5-2D)
<CS5>
(6-2D)
MICMUTE
N.M.
(5-5E)
NOT MOUNTED
+3.3V
+3.3V
R129 1K
C128
+
C7
10u/50V
C127
R153
1K
L104
15
R186 270
R154
2.2K
R177
+
C6
10u/50V
C204
R189 270
R183 270
R178 470
C203
+
C4
10u/50V
C162
0.1u/50V
C163
0.1u/50V
C139
0.1u/50V
C164
0.1u/16V-K
R176
C165
0.1u/50V
C169
1000p/50V
C137
N.M.
C205
N.M.
R190 150
C209
R174 1K
C206
N.M.
C190
R191 150
RA4
270
5
1
8 7
6
2
3
4
IC3
SCE214V(2/2)
MODEM BLOCK
53
52
85
55
155
159
154
68
162
157
160
54
51
88
168
81
80
156
91
167
79
37
110
109
66
65
164
163
56
82
73
94
158
105
106
103
87
104
170
169
150
151
153
112
74
77
76
92
71
72
75
102
98
96
101
100
99
95
93
90
89
84
83
78
86
113
152
111
GPIO15 / CS5
GPIO16
AVDD (IIA)
GPIO37
GPO28
GPIO31
GPO27
GPO25
GPIO34
GPO30
GPIO32
GPIO13
GPIO17
SPKR_OUTP (IIA)
GPO1
MIC_INM (IIA)
MIC_INP (IIA)
GPO29
MCDE0
GPO0
LINE_INP (IIA)
N.C.
SASRXD
GPIO3
GPIO19
GPIO11
GPIO36
GPIO35
VTHON
MIC_BIAS (IIA)
TESTC
FCS
GPIO29
SASCLK2
DSS_PARK
SASRXD2
LINE_OUTP (IIA)
SASTXD2
VOL-C
VOL-B
VOL-A
READY
FALE
FRD
SOUT (IIA)
POR (IIA)
FSYNC (IIA)
ICLK (IIA)
MCLK (IIA)
CTRLI (IIA)
SIN (IIA)
SA1CLK
IA1CLK
IACLK
SR1IO
SR4OUT
SR3IN
IARESET
DVSS(IIA)
DVDD (IIA)
SPKR_OUTM (IIA)
AGND (IIA)
VREF (IIA)
AVSS2 (IIA)
AVSS1 (IIA)FWR
FCLE
SASTXD
C202
CNLIUA-15
CNLIUA-12
CNLIUA-13
CNLIUA-10
SPMUTE
RCVOL
SIGMUTE
DTMFMUTE
CNLIUA-6
CNLIUA-16
CNLIUA-9
SIGRX
ORGSNS-
CSWI
LEDON
VTHON
DR/RBN
FRSNS-
CNPRG-1
CNPRG-3
SIGTX
READY
FCLE FALE
FRD-
FWR-
FCS-
VOLB VOLC
VOLA
CNDSS-5
CNLIUA-1
TELOUT1
SPOUT
CNDSS-7
CNDSS-6
CNDSS-8
W-TONE
THLOOK
CNLIUA-4
CNTH-5
THCHK