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UX-258TH
FO-475TH
[2] TEL/LIU PWB circuit
1
2
6
4
3
5
BDEFG
I
HCA
1
2
6
4
3
5
BDEFG
I
HCA
–
+
–
+
–
+
N.M.
N.M.
VREF
+24V
MJ1-3
C
B
M
MJ1-4
MJ2-3
MJ2-4
TIP
RING
EXT-T
EXT-R
C7
4.7/50
R22
3.3K
T1
2128
C8
0.033
ZD5
HZ2C1
ZD4
HZ2C1
IC1
2904
L2
R21
620
C5
0.01
D4
1SS270
C15
1000P
C17
220P
7
6
R7
JP
D2
1SS270
Q2
2SC1815
+5V
L1
+5V
R13
1.5K
IC1
2904
BB
C
Q1
DTC114
E
C12
4.7/50
R2
150
CML
Q3
DTC114
D3
1SS270
+5V
C19
0.022
C2
1.5
R6
43K
R5
22K (1/2W)
R19
15K
CNLIU-8
TXOUT
C11
4.7/50
R17
10K
C4
2200P
2
3
1
R16
10K
R10
10K
R9
10K
C3
2200P
VREF
CNLIU-7
RX IN
ZD3
HZ27
PC2
TLP521-1
CNLIU-9
CML
B
E
CNLIU-11
IC1
2904
8
4
MJTEL-1
TX
C14
4.7/50
R11
1.5K
L6
MJTEL-4
TX
MJTEL-3
RX
C1
2200P
CNLIU-1
TELOUT
5
C16
1000P
R12
1K
C13
0.47/50
R15
3.3K
R14
36K
C18
1500P
L7
N2024
MJTEL-2
RX
D1
1SS270
E
R1
CNLIU-3
TEL MUTE
N.M.
CNLIU-10
CNLIU-12
+24V
+5V
VA1
VA2
R8
JP
C20
N.M.
R20
VREF
CNLIU-2
TELIN
C9
1000P
HS
CNLIU-5
HOOK SW
CNLIU-6
RHS
R4
91
R3
30
ZD2
HZ2C1
ZD1
HZ2C1
PC1
PC814X
L4
L5
CML
C10
1000P
PC2
TLP521-1
CI
CNLIU-4
PC1
PC814
VREF
R18
1K
R23
1K
C21
C6
22/50
L3
DG
4
3
4
3
4
2
3
1
Q
AR1
RA391PV62
ERZV5D471x2
N.M.
N.M.
N.M.
N.M.
ARG
N.M.
N.M.
NOTE:
These marks are all safety-critical parts.