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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

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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 ) [2] => 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.

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Modification

Tape recorder output on LEF master station allowing conversation from both sides to be recorded. [mkb-info]This modification provides a 10K Ω output to a separate device. Make sure external device has 10K Ω audio input.[/mkb-info]  

Difficulty Level

5 - Hard - circuit creation and internal addition.  

Components Required

1. Resistors:
   • Two 10K Ω, 0.25 W
   • One 10~15K variable resistor
2. Capacitor:
   • Two Aiphone model NP-25V (33 µfd, 25V, non-polarized)

Instructions

1. Install components as shown on the following schematic.
2. This modification will allow a tape recorder to record both sides of the conversation while the master is communicating with another station.

LEF-3

[mkb-info]Add components as shown above, connected from pin 6 of IC2. Connect GND of input to recorder to E of LEF Series master station.[/mkb-info]  

LEF-5

[mkb-info]Add components as shown above, connected from pin 6 of IC2. Connect GND of input to recorder to E of LEF Series master station.[/mkb-info]

LEF-10

[mkb-info]Add components as shown above, connected from pin 6 of IC2. Connect GND of input to recorder to E of LEF Series master station.[/mkb-info] [post_title] => Tape Recorder Output on LEF Master Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => tape-recorder-output-on-lef-master-station [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:41:04 [post_modified_gmt] => 2025-03-12 15:41:04 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/tape-recorder-output-on-lef-master-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] => 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

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