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RX
TX
+
CN152
4
30
+
1
27
13
22
IC109
–
MIC
SP-Phone IC
11
7
16
15
TMU
RMU
V
V
V
V
O
O
O
O
L
L
L
L
1
2
3
4
CN251
7
P13
1
+5VA
2
+5VD
6
+24V
8
THPON
3
AG
4
DG
5
PG
(PG)
from P.S.U
Analog Unit Block Diagram
+5V
IC201
+
VR
VR
MODRX
IC202
63
59
67
73
75
71
40
+5VD
+24V
@
24-DOW
T101
–
DC
+
LOOP
+
+5V
EXHOOK
–
+
IC201
PC103
VR
61
IC151
G/A
CROSS POINT
9
77
78
CTL
DATA
ADDRESS
TONE1
TONE2
RL101
D101
L105
Q1
~
+
~
–
+5V
+5V
PC102
PC101
VAR1
DP
+5V
BELL
T102
+24V
Q271
70
VOX DET
VOX
SW275
SPEAKER AMP
CN241
38
4
8
5
SW273
SPEAKER
IC241
SP MUTE
SW272
35
50
23
22
SW271
CLRX
CLTX
SW274
RESET
S-RNABLE
TEL LINE
POS
T
SA101
R
SA102
L106
EXT
TEL
L103
R1
L104
T1
EXHOOK2
PC105
RL101
LRLY.
+5V
HOOK
SW
+5V
PAPER
SET
+5V
JAM
DETECT
+5V
COVER
SW
+5V
TONE/PULSE
SW
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