Read Panasonic KX-NCP1173XJ (serv.man2) Service Manual online
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KX-NCP1173XJ
5.2.3.3.
Ringer Generating Circuit
The bell signal forms a sine wave out of the rectangular wave of 20/25Hz transmitted from ASIC of MPR, amplifies it up to
AC75Vrms, and generates it.
+40V is stepped up to +180V and -100V by SW power circuit that oscillates at 200KHz, and the voltage between these is ampli-
fied with a focus on +30V to generate the bell signal of AC75Vrms.
AC75Vrms, and generates it.
+40V is stepped up to +180V and -100V by SW power circuit that oscillates at 200KHz, and the voltage between these is ampli-
fied with a focus on +30V to generate the bell signal of AC75Vrms.
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