KX-NT321RU (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 2

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1 Safety Precautions -----------------------------------------------3

1.1. For Service Technicians  ---------------------------------3

2 Warning --------------------------------------------------------------3

2.1. About Lead Free Solder (PbF: Pb free) --------------3

3 Specifications ------------------------------------------------------4

3.1. General Descriptions--------------------------------------4

4 Technical Descriptions------------------------------------------5

4.1. Block Diagram ----------------------------------------------5
4.2. Circuit Operations ------------------------------------------6

5 Location of Controls and Components------------------ 13

5.1. Name and Locations ------------------------------------ 13

6 Installation Instructions--------------------------------------- 14

6.1. Optional Accessory -------------------------------------- 14

7 Troubleshooting Guide---------------------------------------- 15

7.1. No Operation ---------------------------------------------- 15
7.2. LCD Does Not Operate--------------------------------- 18
7.3. Handset Does Not work -------------------------------- 19
7.4. Headset Does Not work -------------------------------- 20
7.5. Speaker-Phone Trouble -------------------------------- 21
7.6. Ethernet Does Not work -------------------------------- 22
7.7. LED Does Not Light ------------------------------------- 24

8 Disassembly Instructions ------------------------------------ 26
9 Maintenance ------------------------------------------------------ 28

9.1. Terminal Guide of the ICs Transistors and

Diodes------------------------------------------------------- 28

9.2. How To Replace a Flat Package IC ----------------- 29
9.3. Memo-------------------------------------------------------- 30

10 Schematic Diagram--------------------------------------------- 31

10.1. Block Diagram -------------------------------------------- 31
10.2. Main No.1 -------------------------------------------------- 32
10.3. Main No.2 -------------------------------------------------- 34
10.4. Main No.3 -------------------------------------------------- 36
10.5. Main No.4 -------------------------------------------------- 38
10.6. Waveform -------------------------------------------------- 40
10.7. Memo-------------------------------------------------------- 43

11 Printed Circuit Board ------------------------------------------ 44

11.1. Main Board------------------------------------------------- 44

12 Appendix Information of Schematic Diagram --------- 46
13 Exploded View and Replacement Parts List ----------- 47

13.1. IC Data------------------------------------------------------ 47
13.2. Cabinet and Electric Parts ----------------------------- 54
13.3. Accessories and Packing Materials ----------------- 55
13.4. Replacement Parts List --------------------------------- 56