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Modifications
Modifications
Modifications
Increase timing circuit of call-in LED
Modification Increase LED timing circuit. Difficulty Level 3 – Moderate – removal or replacement of internal components. Components Required Capacitor: 220 µfd, 16V, ~2 minutes 470 µfd, 16V, ~4 minutes 1000 µfd, 16V, ~5 minutes Instructions Remove and replace C3 on the main PC board of the LEF… Read More
Eliminating Call Tone from Sub Station at LEF Master Station
Modification Eliminate incoming call tone from sub station at a master station. Difficulty Level 3 – Moderate – removal or replacement of internal components. Components Required N/A Instructions LEF-3/3C: remove transistor TR7. LEF-5/5C: remove transistor TR7. LEF-10/10S: remove transistor TR8. LEF-10C: remove transistor T7. LEF-3 … Read More
Installing Volume Control on LE Series Sub Station
Modification Installing a volume control on an LE Series sub station. Difficulty Level 5 – Hard – circuit creation and internal addition. Components Required Variable resistor: 50 ~ 250 Ω, 1 W Resistor: 33… Read More
LED Monitoring Indicator on an LE Series Sub Station
Modification LED monitoring indicator on an LE series sub station. This modification allows users to know that their station is being monitored by a master station. Difficulty Level 5 – Hard – circuit creation and internal addition. Components Required Resistor: 1K… Read More
Tape Recorder Output on LEF Master Station
Modification Tape recorder output on LEF master station allowing conversation from both sides to be recorded. This modification provides a 10K Ω output to a separate device. Make sure external device has 10K… Read More
Using Relay Contacts with the LEF Series
Modification Various relay contacts using the LEF Series. Difficulty Level 2 – Easy/Moderate – component connection to external points. Components Required RY-AC: external signaling relay RY-PA: 12V DC normally open relay Instructions See following diagram for options on closures available. External Signaling Selective Door Release… Read More
All Call to Standard LE Series Sub Stations
Modification Single call sub station to receive All Call and Background Music (BGM). Difficulty Level 1 – Easy – wire connection only. Components Required Capacitor: Aiphone model NP-25V (33 µfd, 25V, non-polarized). Instructions Install capacitor in series between the number terminal of the master station and the… Read More
Separate Transmit and Receive Volume Controls on LEF Series Master Station
Modification Separate transmit and receive volume controls Difficulty Level 5 – Hard – circuit creation and internal addition. Components Required Potentiometer: 10K Ω Resistor: 5.6K Ω Instructions Install potentiometer and… Read More
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