KX-NT321RU (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 10

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10
KX-NT321RU
4.2.6.
Key Input Control Circuit
The key data is under the matrix control by pin21and pin93 to 104 of IC1.
The key information output from KEY_OUT [6-0] is input into KEY_IN [5-0], when the key is pressed.
KEY_OUT is transmitted to KEY_IN as long as button is pressed.
LED will light in 200us seconds after KEY_IN signal.
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