Read Panasonic KX-UT248RU / KX-UT248RU-B (serv.man3) Service Manual online
14
KX-UT248RU/KX-UT248RU-B
4.2.7.
LED Circuit
The lighting of the LEDs is controlled by IC204.
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).
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).
LED dynamic control timing chart
LED lights with 3.3V created by the STB pin of the High output and the COM pin of the Low output.
LED lights with 3.3V created by the STB pin of the High output and the COM pin of the Low output.
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