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KX-NT543RU, KX-NT543RU-B, KX-NT546RU, KX-NT546RU-B (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 12

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KX-NT543RU/KX-NT543RU-B/KX-NT546RU/KX-NT546RU-B
4.2.7.
LED Circuit
The lighting of the LEDs is controlled by IC205.
Ringer LEDs are static lighting system.
Other LEDs light up in a dynamic lighting system.
The duty ratio is 1/10 (ON time 1.6ms).
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