Read Panasonic KX-DT590RU / KX-DT590RU-B Service Manual online
6
KX-DT590RU/KX-DT590RU-B
4.2.
Circuit Operations
4.2.1.
Power supply circuit
The circuit converts the voltage supplied from PBX into the power supply of +3.3V by IC2 (DC/DC Converter IC).
4.2.2.
Key Circuit
The key data is under the matrix control by IC1.
The key information output from KEYOUT is input into KEYIN, when the key is pressed.
The key information output from KEYOUT is input into KEYIN, when the key is pressed.
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