Service manual

UX-A255U
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
(3-5A)
NOT MOUNTED
DG DG
SIGRX
(3-2H)
SP-
SP+
DG
(3-5A)
TELOUT
DG
(1-1F)
(3-2H)
TELIN
DG
(3-5A)
(3-3H)
DG
RXIN
(3-1A)
DG
(3-1A)
DG DG
DG
INCOM
DG
DG
TXOUT
DG
(3-3H)
SIGTX
(3-5A)
DG
DG
DSSIN
DSSOUT
DG
DG
DG
DSSRX
DSSTX
(3-1A)
DG
NOT MOUNTED
NOT MOUNTED
NOT MOUNTED
NOT MOUNTED
NOT MOUNTED
(6-5A)
(6-2F)
(3-3A)
DG
(3-4A)
CML
(6-2A)
(1-3I)
(6-6C)
(3-5A)
(3-5A)
DG
NOT MOUNTED
NOT MOUNTED
IC12C
8
97
6
14
NOT MOUNTED
NOT MOUNTED
VREG
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
Q103
KRC102S
B
C
E
C188
0.1u/16V-K
R160
A
C
LV4051
X0
X1
X2
X3
X4
X5
X6
X7
X
B
VDD
GND
VEE
E-
IC5
16
7
11
10
9
6
3
13
14
15
12
1
5
2
4
8
R165
6.8K
C172
R121
150K
D102
1SS355
R197
IC12A
3
4
5
1
2
13
R137
20K
C212
0.1u/50V
Q104
KRC102S
B
C
E
Q112
B
C
E
R198
ZD101
N.M.
C189
1u/10V
R164
1M
C214
R184
R180 39K
R194
IC10A
4
5
3
9
7
6
8
16
IC10B
15
1
2
10
7
6
8
16
C2
47u/25V
1
2
C187
0.1u/16V-K
R143 39K
R181
R144 24K
C182
1u/10V-K
C183
IC11
2
1
5
3
4
C181 0
R140 470K
R138
N.M.
R142 200K
C216
R122
100K
C156
0.1u/50V
C186
0
C125
1u/10V
R146 91K
R193
0
C150
1u/10V
R203
R136
3K
R196
R201
C213
R145 6.2K
C185
R124 220K
R131
15K
IC12B
4
3
5
C215
R202
Q106
B
C
E
C184
R141 1.5M
C208
1u/10V-K
R195
0
R200
Q105
KRC102S
B
C
E
D103
1SS355
IC4
2
1
5
3
4
C133
0.01u/50V
C134 220p/50V
R139 220K
C151
4700p/50V
R167
4.7K
R182
C155
-
+
NJM2113
IC7
5
4
3
2
1
7
8
6
IC10C
14
12
13
11
7
6
8
16
C179
1u/10V-K
C180
CNLIUA-5
CNLIUA-14
SPOUT
DTMFMUTE
TELOUT1
CNSP-1
SIGRX
CNLIUA-7
VOLA
VOLB
VOLC
BZOUT1
RCVOL
CNDSS-11
SIGMUTE
SIGTX
CNLIUA-8
CNDSS-9
CNSP-2
CNDSS-13
W-TONE
SPMUTE
CNDSS-10
CNDSS-12
ICM
ICM
CNLIUA-9
TELOUT
RLYCONT
DTMFMUTE
RCVOL
TELOUT
Analog signal block 6/6
6 – 6