KX-DT343UA - Panasonic PBX Service Manual (repair manual). Page 8

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8
KX-DT343UA/KX-DT343UA-B
4.2.3.
LED Circuit
The lighting of the LED is controlled by pin 19 to 28 (Row) and pin 11 to 16 (Colum) of IC2.
The LED lights up in a dynamic lighting system.
The duty ratio is 1/8 (ON time 1.5ms).
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