KX-T7740X (serv.man2) - Panasonic Telephone Service Manual (repair manual). Page 15

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9.4. KEY INPUT CONTROL CIRCUIT
Sequential input information is executed by dynamic scanning.
The ports terminal name of IC1, D5, D9~11, R70 of IC1 or brought to High status consecutively.
If a key is pressed, the key-in information input is executed by ports terminal name of IC1, R72, R73, R80~83, R90~93.
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