4 ] Analog Signal Processing Group - Brother FAX100 Service Manual

[ 4 ] Analog signal processing group
1 Analog front end IC
Processes the analog I/O signals from/to the MODEM.
2 Main-NCU connector
3 Analog signal selectors
3-1: Selects either RL1 or RL2 signals inputted from the communications net-
3-2: Selects either input signals from the handset or those from the MODEM.
3-3: Selects either sound signals (e.g. alarm beeps, key clicks and ringer sounds)
4 Amplifier circuit for signals outputted from the MODEM
5 Amplifier & shaper circuit for signals inputted from the communications network
6 Speaker amplifier circuit
Amplifies sounds issued from the above analog signal selector (3) and feeds them
to the speaker.
7 Speaker connector
Main PCB Circuit Diagram 4/4
work.
generated by the FAX engine or signals selected by 3-1.
III – 15