Brother International IntelliFax-3550 Service Manual - Page 44
Telephone circuit, Dial pulse generator & loop current detector
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2 12 2 2 2 2 : 2 8 3 B 3 9 A 4 5 6 C 7 NCU PCB Circuit Diagram (European versions) 1 Surge absorber 2 Noise filters 3 Line relay (CML relay) 4 Line transformer 5 Circuit related to the line transformer 6 High-impedance transformer circuit 7 Calling signal detector 8 Loop current detector 9 Dial pulse generator & loop current detector : Telephone circuit A Reference voltage generation circuit for the operational amplifier in |. B Pulse shaper C Line current detection input circuit III - 25
III –
25
NCU PCB Circuit Diagram (European versions)
1
Surge absorber
2
Noise filters
3
Line relay (CML relay)
4
Line transformer
5
Circuit related to the line transformer
6
High-impedance transformer circuit
7
Calling signal detector
8
Loop current detector
9
Dial pulse generator & loop current detector
:
Telephone circuit
A
Reference voltage generation circuit for the operational amplifier in
.
B
Pulse shaper
C
Line current detection input circuit
1
2
2
2
2
2
3
4
5
6
7
8
9
:
A
C
B
2
2
3