ICM-400 Series Intercom Stations
Page 6
Document IM-ICM-400-2.14
The pin configuration of the station connector is:
MTA Pin
Signal
1
Audio +
2
Audio -
3
N/C
4
N/C
MTA Pin Signals
To insert the signal wires into the connector you remove the white cover from the connector, insert the connector
into the tool from the left side (it will travel through the tool in the direction indicated by the arrow), pull the
trigger once to load the connector. Then insert the signal wire for pin 1 (do not strip the wire) into the hole on the
top of the tool and pull the trigger to insert the wire into the connector. Then repeat to install the other signal wire.
Finally, remove the connector from the tool, replace the cover, and then slide the connector onto the pins on the
intercom station.
3.2 Switch Headers
The standard faceplate mounted switch(es) can be brought out to headers for connection to external devices. The
internal switch contacts are brought out to pins 1 and 2 of the header CN3. An external switch can be connected to
pins 3 and 4 of the header. If the external switch closes the closure will be transmitted to the system in the same
manner as the internal switches on other stations. One or two headers can be installed. CN3 is the header for
Switch B and CN4 is the header for Switch A. The external switch connections to the header(s) are made with a
female 4-pin AMP MTA-100 series connector.
MTA Pin
Signal
1
Switch 1Out +
2
Switch 1 Out -
3
Switch 1 In +
4
Switch 1 In –
4.
ICB-400 Intercom Board (Talkback Kit)
The ICB-400 is used to convert a 45-ohm loudspeaker into an intercom station. The ICB-400 can be used with a 45-
ohm loudspeaker without a matching transformer. It may be used to connect an 8 ohm cone type loudspeaker
through a 25 ohm matching transformer at a 5 watt tap. Two 8 ohm speakers may be connected in parallel if each
transformer taps is set at a 2.5 watt tap. With the insulated option the ICB-400 is designed for easy mounting to a
loudspeaker assembly (using Velcro strips). The ICB-400 intercom board is not recommended for use with
compression type loudspeakers.
ICB-400 Intercom Board talkback kits can be installed on standard 8” loudspeakers to permit them to operate the
same as any intercom station. The units have pigtail leads to connect the loudspeaker. These leads are soldered to
the terminals labeled Spkr + and Spkr - shown on the back view of the printed circuit board. The pigtail leads are
24” in length and can be cut to a shorter length if required. The two optional remote switches are connected to
connectors CN3 and CN4 on the printed circuit board (Normally Switch B will be used as a remote call switch).
