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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

[mkb-info]The capacitor is in the same area on the PC board for both the LEF and LEF-C master stations.[/mkb-info]  

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

[post_title] => Increase timing circuit of call-in LED [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => increase-timing-circuit-of-call-in-led [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:40:45 [post_modified_gmt] => 2025-03-12 15:40:45 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/increase-timing-circuit-of-call-in-led/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 36831 [post_author] => 23 [post_date] => 2021-04-29 17:15:42 [post_date_gmt] => 2021-04-30 00:15:42 [post_content] =>

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

 

LEF-5

   

LEF-10

    [post_title] => Eliminating Call Tone from Sub Station at LEF Master Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => eliminating-call-tone-from-sub-station-at-lef-master-station [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:40:57 [post_modified_gmt] => 2025-03-12 15:40:57 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/eliminating-call-tone-from-sub-station-at-lef-master-station/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 36836 [post_author] => 23 [post_date] => 2021-04-29 16:47:14 [post_date_gmt] => 2021-04-29 23:47:14 [post_content] =>

Modification

Installing a volume control on an LE Series sub station.  

Difficulty Level

5 - Hard - circuit creation and internal addition.  

Components Required

1. Variable resistor: 50 ~ 250 Ω, 1 W
2. Resistor: 33 Ω, 1 W

Instructions

1. Install components as shown on the diagram.
2. No physical provisions are made on the sub station for the addition of a volume control. Chassis modification is required.

LE-A

 

LE-AN

  [mkb-info]Add components as shown above. Volume control will affect communication and call tone volume.[/mkb-info] [post_title] => Installing Volume Control on LE Series Sub Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => installing-volume-control-on-le-series-sub-station [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:40:58 [post_modified_gmt] => 2025-03-12 15:40:58 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/installing-volume-control-on-le-series-sub-station/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [3] => WP_Post Object ( [ID] => 36840 [post_author] => 23 [post_date] => 2021-04-29 17:20:33 [post_date_gmt] => 2021-04-30 00:20:33 [post_content] =>

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

1. Resistor: 1K Ω, 0.25 W
2. LED: general purpose

Instructions

1. Run two extra wires to each sub station requiring the modification. (Only one extra wire is required when using LE-C, LE-CN, or LE-DL.)
2. Install LED and resistor as shown on diagram.
3. When a master station selects that sub station, the LED will illuminate.
4. No physical provisions are made on the sub station for the addition of an LED. Chassis modification or external mounting is required.

Diagram

Notes:

• Inside the sub station, install the general-purpose LED and 1K Ω resistor as shown above.
• Since there is no designated location for placement of the LED, either modify the chassis of the sub station or mount the LED externally.
• The LE-C, LE-CN and LE-DL already have the "+" wire connected to them. Only the "K" wire will need to be added with those models.

[post_title] => LED Monitoring Indicator on an LE Series Sub Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => led-monitoring-indicator-on-an-le-series-sub-station [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:40:59 [post_modified_gmt] => 2025-03-12 15:40:59 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/led-monitoring-indicator-on-an-le-series-sub-station/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [post_count] => 4 [current_post] => -1 [before_loop] => 1 [in_the_loop] => [post] => WP_Post Object ( [ID] => 36820 [post_author] => 23 [post_date] => 2021-04-29 17:00:58 [post_date_gmt] => 2021-04-30 00:00:58 [post_content] =>

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

[mkb-info]The capacitor is in the same area on the PC board for both the LEF and LEF-C master stations.[/mkb-info]  

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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