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KX-NT543RU, KX-NT543RU-B, KX-NT546RU, KX-NT546RU-B (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 13

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13
KX-NT543RU/KX-NT543RU-B/KX-NT546RU/KX-NT546RU-B
LED dynamic control timing chart
LED lights with 3.3V created by the STB pin of the High output and Transistor Collector pin of the Low output. 
4.2.8.
EHS Circuit
EHS is controlled by IC205. 
The audio signals are exchanged with IC501 through HANDSET JACK(JK101). 
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