KX-DT321UA - Panasonic PBX Service Manual (repair manual). Page 8

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8
KX-DT321UA/KX-DT321UA-B
4.2.3.
LED Circuit
The lighting of the LEDS is controlled by pin 14 to 18 (Row) and pin 8 to 13 (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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