Panasonic KX-NS720 - User Manual

© Panasonic System Networks Co., Ltd. 2014
Unauthorized copying and distribution is a violation
of law.
ORDER NO. KMS1411488SE
Hybrid IP-PBX
Model No. KX-NS700
KX-NS720 Series
Power Supply Unit Addition
TABLE OF CONTENTS
PAGE PAGE
1 Technical Descriptions ----------------------------------------- 2
1.1. Power Supply Unit----------------------------------------- 2
1.1.1. Block Diagram and Circuit Description of
PSU ------------------------------------------------------ 2
1.2. AC input, Rectification Smoothing Circuit ----------- 2
1.3. Main Converter--------------------------------------------- 3
1.4. DC Switch and DC Output Circuit --------------------- 4
1.5. AC Alarm Circuit and DC Alarm Circuit-------------- 5
2 Troubleshooting Guide----------------------------------------- 6
2.1. Power Supply Unit----------------------------------------- 6
2.1.1. No Voltage is Output at All (1)--------------------- 6
2.1.2. No Voltage is Output at All (2)--------------------- 7
2.1.3. 41V are Not Output----------------------------------- 8
3 Schematic Diagram ----------------------------------------------9
3.1. Power Supply Board ------------------------------------ 14
3.2. Waveform ----------------------------------------------------9
4 Printed Circuit Board ------------------------------------------ 15
4.1. Power Supply Board ------------------------------------ 15
4.1.1. Component View ------------------------------------ 15
4.1.2. Bottom View ------------------------------------------ 16
5 Exploded View and Replacement Parts List----------- 17
5.1. Power Supply Unit --------------------------------------- 17
5.2. Replacement Parts List--------------------------------- 18
5.2.1. Power Supply Board-------------------------------- 18
Please file and use this supplement manual together with the service manual.

Summary

1 Technical Descriptions

1.1. Power Supply Unit

Details the switching regulator power supply unit and its DC outputs.

1.2. AC input, Rectification Smoothing Circuit

Explains the AC input stage and rectification/smoothing circuit.

1.3. Main Converter

Describes the main converter circuit for primary DC to secondary voltage conversion.

1.4. DC Switch and DC Output Circuit

Details the DC switch and output circuits for 41V and 15V.

1.5. AC Alarm Circuit and DC Alarm Circuit

Explains the AC/DC alarm signal generation circuit.

2 Troubleshooting Guide

2.1. Power Supply Unit

Provides troubleshooting steps for the power supply unit.

2.1.1. No Voltage is Output at All (1)

Troubleshooting steps for no output voltage (case 1).

2.1.2. No Voltage is Output at All (2)

Troubleshooting steps for no output voltage (case 2).

2.1.3. 41 V are Not Output

Troubleshooting steps when 41V output is missing.

3 Schematic Diagram

3.1. Waveform

Displays various waveform measurements for the power supply.

3.2. Power Supply Board

Presents the schematic diagram of the power supply board.

4 Printed Circuit Board

4.1. Power Supply Board

Shows the component layout on the power supply board.

4.1.1. Component View

Illustrates the component view of the power supply board.

4.1.2. Bottom View

Displays the bottom view of the power supply board.

5 Exploded View and Replacement Parts List

5.1. Cabinet and Electrical Parts Location

Shows the location of electrical parts in the cabinet.

5.2. Replacement Parts List

Lists replacement parts for the power supply unit.

5.2.1. Power Supply Board parts (PCB3)

Details replacement parts for the power supply board (PCB3).

Panasonic KX-NS720 Specifications

General

Brand	Panasonic
Model	KX-NS720
Category	Power Supply
Language	English