Hello everyone,
I have a persistent issue with a commercial intercom system (likely made in Turkey, based on the unit). Voice communication (audio) works perfectly, but the outdoor panel did not return the ring when the call button is pressed.
Whell the system consists of three main circuit boards (see attached photos):
A. Board 1: Power Supply / Ringer Generator (White Board) with LS1240A, BD442 and BD140 Power transistors for ring amplification.
B. Board 2: Handset (Indoor Unit) Role: Contains the microphone, the speaker/baffle, the manual hook switch, and the open-door circuit.
The hock switch contains two switch the first one (on/off) for the mic, and the second one (nc/no) for the specker so when the phone is hocked down the specker is closed to the ring pin 25 and when it is hocked up the specker is closed to the communication pin (2 or 3) that communicate with the outdoor panel. When hocked up we can listen the ringtone in the outdoor station but not in the handset, but when hocked down we listen the ringtone in the handset but we cant get a confirmation in the outdoor panel that it rings.
The handset rings when its pin 25 is recorder to pin 19 on the main unit and pin 1 to pin 14 (gnd)
C. Board 3: Entrance Panel (Outdoor Unit) : Contains microphone, speaker and amplifier LM386.
I think I explained as well as I can, and thank you in advance
I have a persistent issue with a commercial intercom system (likely made in Turkey, based on the unit). Voice communication (audio) works perfectly, but the outdoor panel did not return the ring when the call button is pressed.
Whell the system consists of three main circuit boards (see attached photos):
A. Board 1: Power Supply / Ringer Generator (White Board) with LS1240A, BD442 and BD140 Power transistors for ring amplification.
B. Board 2: Handset (Indoor Unit) Role: Contains the microphone, the speaker/baffle, the manual hook switch, and the open-door circuit.
The hock switch contains two switch the first one (on/off) for the mic, and the second one (nc/no) for the specker so when the phone is hocked down the specker is closed to the ring pin 25 and when it is hocked up the specker is closed to the communication pin (2 or 3) that communicate with the outdoor panel. When hocked up we can listen the ringtone in the outdoor station but not in the handset, but when hocked down we listen the ringtone in the handset but we cant get a confirmation in the outdoor panel that it rings.
The handset rings when its pin 25 is recorder to pin 19 on the main unit and pin 1 to pin 14 (gnd)
C. Board 3: Entrance Panel (Outdoor Unit) : Contains microphone, speaker and amplifier LM386.
I think I explained as well as I can, and thank you in advance
Attached Files
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