Panasonic KX-NCP1170XJ (serv.man2) Service Manual ▷ View online
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KX-NCP1170XJ
5.2.2.3.
EXT-CID Transmission
This ASIC (IC600) generates the extension Caller ID signals (FSK signal) with the CPU control.
The data flow is shown below.
The data flow is shown below.
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KX-NCP1170XJ
5.2.3.
Power Supply Circuit
5.2.3.1.
Power Supply Voltage Generator
The input from the main power supply is in 3 voltage levels: +15V,+15VPT,+40V.
Since the voltage levels: +15V,+5V,+3.3V,+40V,+160V,-100V and AC75Vrms are required onboard, voltage levels are generated
onboard as written below.
Since the voltage levels: +15V,+5V,+3.3V,+40V,+160V,-100V and AC75Vrms are required onboard, voltage levels are generated
onboard as written below.
5.2.3.2.
DC/DC Circuit (+3.3V, +5V)
The protection circuit consists of an output short protection and an overvoltage protection.
When an output of power supply is short, IC800 or IC801 works to stop the output as the output short protection.
When +5V and/or +3V output become overvoltage caused by Q802 and/or Q803 short,it is detected by D806 and D807.
Q800 is cut by Q801 to shut down the input power supply as overvoltage protection.
When an output of power supply is short, IC800 or IC801 works to stop the output as the output short protection.
When +5V and/or +3V output become overvoltage caused by Q802 and/or Q803 short,it is detected by D806 and D807.
Q800 is cut by Q801 to shut down the input power supply as overvoltage protection.
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KX-NCP1170XJ
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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KX-NCP1170XJ
6 Location of Controls and Components
6.1.
Names and Locations
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