Increase timing circuit of call-in LED

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Modification

Increase LED timing circuit.

 

Difficulty Level

3 – Moderate – removal or replacement of internal components.

 

Components Required

  1. Capacitor:
    • 220 µfd, 16V, ~2 minutes
    • 470 µfd, 16V, ~4 minutes
    • 1000 µfd, 16V, ~5 minutes

Instructions

  1. Remove and replace C3 on the main PC board of the LEF Series master station with a different value capacitor to achieve the desired LED timing length.
  2. LEDs will stay illuminated for the duration of the timing circuit from the moment the last sub station places a call.
LEF Master Stations

Locate and replace capacitor C3. Change value to a higher level to reach the desired timing circuit length.

  • 220 µfd, 16V, ~2 minutes
  • 470 µfd, 16V, ~4 minutes
  • 1000 µfd, 16V, ~5 minutes
The capacitor is in the same area on the PC board for both the LEF and LEF-C master stations.

 

LEF-10C Master station

Locate and replace capacitor C3. Change value to a higher level to reach the desired timing circuit length.

  • 220 µfd, 16V, ~2 minutes
  • 470 µfd, 16V, ~4 minutes
  • 1000 µfd, 16V, ~5 minutes
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