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Ensure the SKK-620C is correctly grounded 

  

In a dual-master station system, a loud feedback sound is heard at both master stations. 

This can be caused by a common power supply and/or missing DAK-2S. If both C-ML/A master stations share the same power supply, a ground loop feedback will occur when the talk button is pushed. Install separate SKK-620C power supplies or install batteries for each master station. The DAK-2S "Dual Master Component Modules" must also be installed per the wiring diagram below:          

Communication timeout issues 

If the resistance of the wire is too large, usually from exceeding distance limitations, the master station may not time out as designed. 22AWG = 245'  18AWG = 490'    

Communication volume is too loud or too soft 

It's possible the volume control is not adjusted properly. Remove the front cover of the C-ML/A and locate the volume potentiometer through a hole located at the bottom of the station. Use a small screwdriver to adjust the volume; clockwise to increase, and counterclockwise to decrease. Do not turn the potentiometer too hard in either direction or damage may occur.    [post_title] => Common Communication Troubleshooting for the C-123 Kit [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => common-communication-troubleshooting-for-the-c-123-kit [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:41:18 [post_modified_gmt] => 2025-03-12 15:41:18 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/common-communication-troubleshooting-for-the-c-123-kit/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [post_count] => 1 [current_post] => -1 [before_loop] => 1 [in_the_loop] => [post] => WP_Post Object ( [ID] => 36867 [post_author] => 23 [post_date] => 2021-07-26 18:15:21 [post_date_gmt] => 2021-07-27 01:15:21 [post_content] =>

Ensure the SKK-620C is correctly grounded 

  

In a dual-master station system, a loud feedback sound is heard at both master stations. 

This can be caused by a common power supply and/or missing DAK-2S. If both C-ML/A master stations share the same power supply, a ground loop feedback will occur when the talk button is pushed. Install separate SKK-620C power supplies or install batteries for each master station. The DAK-2S "Dual Master Component Modules" must also be installed per the wiring diagram below:          

Communication timeout issues 

If the resistance of the wire is too large, usually from exceeding distance limitations, the master station may not time out as designed. 22AWG = 245'  18AWG = 490'    

Communication volume is too loud or too soft 

It's possible the volume control is not adjusted properly. Remove the front cover of the C-ML/A and locate the volume potentiometer through a hole located at the bottom of the station. Use a small screwdriver to adjust the volume; clockwise to increase, and counterclockwise to decrease. Do not turn the potentiometer too hard in either direction or damage may occur.    [post_title] => Common Communication Troubleshooting for the C-123 Kit [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => common-communication-troubleshooting-for-the-c-123-kit [to_ping] => [pinged] => [post_modified] => 2025-03-12 08:41:18 [post_modified_gmt] => 2025-03-12 15:41:18 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/common-communication-troubleshooting-for-the-c-123-kit/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [comment_count] => 0 [current_comment] => -1 [found_posts] => 1 [max_num_pages] => 1 [max_num_comment_pages] => 0 [is_single] => [is_preview] => [is_page] => [is_archive] => 1 [is_date] => [is_year] => [is_month] => [is_day] => [is_time] => [is_author] => [is_category] => [is_tag] => [is_tax] => 1 [is_search] => [is_feed] => [is_comment_feed] => [is_trackback] => [is_home] => [is_privacy_policy] => [is_404] => [is_embed] => [is_paged] => [is_admin] => [is_attachment] => [is_singular] => [is_robots] => [is_favicon] => [is_posts_page] => [is_post_type_archive] => 1 [query_vars_hash:WP_Query:private] => cb8547f66fac6b25bb636d2ac8dfe062 [query_vars_changed:WP_Query:private] => 1 [thumbnails_cached] => [allow_query_attachment_by_filename:protected] => [stopwords:WP_Query:private] => [compat_fields:WP_Query:private] => Array ( [0] => query_vars_hash [1] => query_vars_changed ) [compat_methods:WP_Query:private] => Array ( [0] => init_query_flags [1] => parse_tax_query ) )