Brother International FAX-1010 Service Manual - Page 36

V r:. a. ::.t T ..T •• • ® T. . . .. aami s WW91B9.2. :14 ° @-1 @-2 O -3 :!. Main PCB Circuit Diagram 415 0 Connector for the NCU ® Analog signal selectors 0-1: Selects either input signals from the handset or those from the MODEM. 0-2: Selects either RL1 or RL2 signals inputted from the communications network. 0-3: Selects either sound signals (e.g., alarm beeps, key clicks and ringer sounds) generated by the FAX engine or signals selected by 0-2. ® Voice switching analog selectors ®-1: Switches between the output line and input line for monitoring. When switched to the output line, this selector allows FAX sending operation to be monitored; when switched to the input line, it allows received voices to be monitored. ®-2: Selects either voice signals inputted from the communications network or recorded voice signals inputted from the microphone or handset through the MODEM. ® Amplifier circuit for signals outputted from the MODEM. ® Analog front end IC which processes the analog I/O signals from/to the MODEM. ® Amplifier & shaper circuit for signals inputted from the communications network. C) Telephone circuit for transmitting signals. ® Speaker amplifier circuit which amplifies sounds issued from the above analog signal selector 0-3 and feeds them to the speaker. III - 24