Read Panasonic KX-NS500 / KX-NS520 Service Manual Supplement online
2
TABLE OF CONTENTS
PAGE
PAGE
1 CHANGES -----------------------------------------------------------3
1.1. Subject -------------------------------------------------------3
1.2. Replacement Parts List -----------------------------------3
1.2. Replacement Parts List -----------------------------------3
2 Technical Descriptions------------------------------------------5
2.1. Power Supply Unit -----------------------------------------5
2.1.1. Block Diagram and Circuit Description of
PSU -------------------------------------------------------5
2.2. AC input, Rectification Smoothing Circuit ------------5
2.3. Main Converter ---------------------------------------------6
2.4. DC Switch and DC Output Circuit----------------------7
2.5. Battery voltage input and output------------------------8
2.6. AC Alarm Circuit and DC Alarm Circuit---------------9
2.3. Main Converter ---------------------------------------------6
2.4. DC Switch and DC Output Circuit----------------------7
2.5. Battery voltage input and output------------------------8
2.6. AC Alarm Circuit and DC Alarm Circuit---------------9
3 Troubleshooting Guide---------------------------------------- 10
3.1. Power Supply Unit --------------------------------------- 10
3.1.1. No Voltage is Output at All (1)-------------------- 10
3.1.2. No Voltage is Output at All (2)-------------------- 11
3.1.3. 41V are Not Output --------------------------------- 12
3.1.4. Battery Backup Function Does Not
3.1.2. No Voltage is Output at All (2)-------------------- 11
3.1.3. 41V are Not Output --------------------------------- 12
3.1.4. Battery Backup Function Does Not
Operate / PSU can Not Charge Batteries ----- 13
4 Schematic Diagram--------------------------------------------- 14
4.1. Power Supply Board------------------------------------- 14
4.2. Waveform -------------------------------------------------- 15
4.2. Waveform -------------------------------------------------- 15
4.2.1. Power Supply Board-------------------------------- 15
5 Printed Circuit Board ------------------------------------------ 20
5.1. Power Supply Board------------------------------------- 20
5.1.1. Component View ------------------------------------ 20
5.1.2. Bottom View ------------------------------------------ 21
5.1.2. Bottom View ------------------------------------------ 21
6 Exploded View and Replacement Parts List ----------- 22
6.1. Cabinet and Electrical Parts Location--------------- 22
6.1.1. PSU ----------------------------------------------------- 22
6.2. Replacement Parts List --------------------------------- 24
6.2.1. Power Supply Board parts (PCB3)-------------- 24
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