KX-UDS124CE - Panasonic PBX Service Manual (repair manual). Page 11

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11
KX-UDS124CE
4.9.
LED circuit
D301(Red LED) and D302(Green LED) are controlled by IC101(DMW74).
4.10. Backup circuit
Electrolytic capacitors(C518, C519) are used to backup 3.3VCC.
IC501 is used to charge C518 and C519, IC503 is used to discharge.
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