KX-NS1000UC - Panasonic PBX Service Manual (repair manual). Page 13

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Block Name : MOH, External Pager interface Circuit
Circuit Configuration :

• CODEC : IC700

EPG port is used for external paging function, MOH port is also used for external MOH sound input interface. This MOH inter-
face has AGC function to avoid large input level signal.

Block Name : DSP, Door phone, FAN, RS232C, Power Connector Circuit
Description :

DSP1,2 and Door phone card are connected to expansion bus interface. And also these option card are powered from these
interface connectors.
FAN interface is used for FAN driving power supply, also FAN alarm signal is monitored via this connector.
Power connector is used for DC+15V power input interface. And DC/AC-Alarm signal is used to monitor Power Unit alarm sta-
tus.

Block Name : FAX and optional service card (free slot) Storage Memory interface Circuit
Description :

FAX and Option card (free slot) are connected to expansion bus interface. Option card power supply function is also con-
tained.
Storage Memory Card  slot is connected to expansion bus interface too. CPU will access Storage Memory Card  Memory via
expansion bus interface.

Block Name : Internal Power Supply Circuit and Reset Signal Generate
Circuit Configuration :

• DC-DC Converter (DC+15 to 3.3V/5.0V) : IC1200
• DC-DC Converter (DC+15 to 5.0V for USB) : IC1210
• DC-DC Converter (DC+5.0V to 1.8V) : IC1201
• DC-DC Converter (DC+5.0V to 0.98V) : IC1202
• Regulator (DC+3.3V to 2.5V) : IC1203
• Regulator (DC+3.3V to 1.2V) : IC1205
• Regulator (DC+1.8V to 0.9V) : IC103

Every voltage used in Motherboard is generated from DC+15V Input.

And also each output voltage monitored by voltage detection IC and reset signal is generated by these IC.