KX-DT321UA - Panasonic PBX Service Manual (repair manual). Page 6

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6
KX-DT321UA/KX-DT321UA-B
4.2.
Circuit Operations
4.2.1.
Key Input Control Curcuit
The key data is under the matrix control by 20 to 23(KEYOUT) and 28 to 35(KEYIN) of IC6.
The key information output from KEYOUT is input into KEYIN, when the key is pressed.
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