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ELECTRICAL CIRCUITS
4 - 3
4
EU/AU/AS/C models
Fig. 4-3
RLY3
CML relay
RLY4
Relay
+
DB1
-
~
~
NCU board
Lb
La
a2
b2
CN3
Line
External
telephone
Line current
detection
circuit
IC5
Analog
switch
IC3
Analog
switch
Ring signal
detection
circuit
CNG signal
detection
circuit
Dial pulse
generation
circuit
DC
consumption
circuit
AG
IC6
IC6
IC4
T1
IC4
0
1
0
1
CN4
FAX board
CI
ANSDET
RLADJ1
RLADJ2
TXOUT
LD
ATT3DB
CML
REVB
REVA
RXIN