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Summary 

Upon power up, the C-ML/A maser station squeals and the batteries seem to overheat.   

Cause 

Power supply and batteries are both installed.   

Solution 

Take batteries out of the C-ML/A master station if powered with an SKK-620C power supply. Both power sources cannot be used simultaneously.     Per the C-123 instruction manual:  [post_title] => C-123 Speakers Squeal and Station Overheats [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => c-123-speakers-squeal-and-station-overheats [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/c-123-speakers-squeal-and-station-overheats/ [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] => 36872 [post_author] => 23 [post_date] => 2021-07-26 18:17:44 [post_date_gmt] => 2021-07-27 01:17:44 [post_content] =>

Summary 

Upon power up, the C-ML/A maser station squeals and the batteries seem to overheat.   

Cause 

Power supply and batteries are both installed.   

Solution 

Take batteries out of the C-ML/A master station if powered with an SKK-620C power supply. Both power sources cannot be used simultaneously.     Per the C-123 instruction manual:  [post_title] => C-123 Speakers Squeal and Station Overheats [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => c-123-speakers-squeal-and-station-overheats [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/c-123-speakers-squeal-and-station-overheats/ [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] => 897aeeb60aaeb092ddd5ad58e96a1ce7 [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 ) )