Brother IntelliFax-3550 Service Manual page 44

2
2
1
2
2
2
:
2
2
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
8 3
B
3
9
NCU PCB Circuit Diagram (European versions)
III – 25
4
6
7
A
5
C
.