Read Panasonic KX-UDS124CE Service Manual online
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KX-UDS124CE
4.2.
DMW74(IC101) and DE56(IC302)
DMW74(IC101) is main IC which control almost IC's in this system. CPU, DSP function and RF, Ethernet, memory interface are
implemented in this IC.
DSP in DMW74 and DE56 share the function and control voice data processing.
implemented in this IC.
DSP in DMW74 and DE56 share the function and control voice data processing.
4.3.
Power Supply Circuit ( Include PoE )
KX-UDS124 support 2 way power supply ; AC adaptor and PoE (Power over Ethernet).
9V is supplied from AC adaptor through JK501 and 48V is supplied from ethernet through JK201.
IC202 converts 48V to intermadiate voltage. IC504 converts 3.3V which is used to internal logic and RF part.
1.2V is made by IC502 from 3.3V.
9V is supplied from AC adaptor through JK501 and 48V is supplied from ethernet through JK201.
IC202 converts 48V to intermadiate voltage. IC504 converts 3.3V which is used to internal logic and RF part.
1.2V is made by IC502 from 3.3V.
4.4.
Reset/Power Down Detect circuit
IC301(Reset IC) supplies power on reset signal to IC101(DMW74) and IC102(Flash ROM).
IC101(DMW74) supplies each reset signals to IC302(DE56) and IC201(PHY) by I/O ports of IC101.
IC101 is monitoring voltage drop through PD detect circuit.
IC101(DMW74) supplies each reset signals to IC302(DE56) and IC201(PHY) by I/O ports of IC101.
IC101 is monitoring voltage drop through PD detect circuit.
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