Read Panasonic KX-T7630RU Service Manual online
9
KX-T7630RU-B
4.2.4.
Reset Circuit
Reset Signal is outputted from IC1 and inputted into IC3 and IC5 at the connection of TEL cord.
4.2.5.
Power Supply Circuit
This circuit converts the voltage supplied from PBX into the power supply voltage of +3.3V by IC6(Switching Regulator IC).
IC10 controls the power supply circuit as below to turn IC6 on in low consumption current at starting up.
IC10 controls the power supply circuit as below to turn IC6 on in low consumption current at starting up.
• Input Voltage approx. 30V or less
→IC10-pin 1 L →IC6 OFF
• Input Voltage approx. 30V or more
→IC10-pin 1 HiZ→IC6ON
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