KX-DT346UA - 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 ------------------------------------------------------5

3.1. General Descriptions--------------------------------------5

4 Technical Descriptions------------------------------------------6

4.1. Block Diagram ----------------------------------------------6
4.2. Circuit Operations ------------------------------------------7

5 Location of Controls and Components------------------ 16

5.1. Name and Locations ------------------------------------ 16

6 Installation Instructions--------------------------------------- 17
7 Troubleshooting Guide---------------------------------------- 18

7.1. No Operation ---------------------------------------------- 18
7.2. LCD Does Not Operate--------------------------------- 19
7.3. Handset Does Not work -------------------------------- 20
7.4. Headset Does Not work -------------------------------- 21
7.5. Speaker-Phone Does Not work----------------------- 22
7.6. Bluetooth Does Not work------------------------------- 23
7.7. DXDP-DPT Does Not work ---------------------------- 24
7.8. Option (NT303) Does Not work----------------------- 24
7.9. Option (DT301) Does Not work----------------------- 25

7.10. Test Mode -------------------------------------------------- 25

8 Disassembly and Assembly Instructions--------------- 26

8.1. Remove Main Board------------------------------------- 26
8.2. Disassembly for Lower Cabinet Ass’y -------------- 27
8.3. Assembly for Lower Cabinet Ass’y  ----------------- 28

9 Miscellaneous ---------------------------------------------------- 30

9.1. Terminal Guide of the ICs Transistors and

Diodes------------------------------------------------------- 30

9.2. How To Replace a Flat Package IC ----------------- 31

10 Schematic Diagram--------------------------------------------- 32

10.1. Main Board------------------------------------------------- 32
10.2. Jack---------------------------------------------------------- 36
10.3. LCD ---------------------------------------------------------- 37
10.4. Waveform -------------------------------------------------- 38

11 Printed Circuit Board ------------------------------------------ 40

11.1. Main Board------------------------------------------------- 40
11.2. Jack Board ------------------------------------------------- 42
11.3. LCD Board ------------------------------------------------- 43

12 Appendix Information of Schematic Diagram --------- 44
13 Exploded View and Replacement Parts List ----------- 45

13.1. IC Data------------------------------------------------------ 45
13.2. Cabinet and Electric Parts ----------------------------- 49
13.3. Accessories and Packing Materials ----------------- 50
13.4. Replacement Parts List --------------------------------- 51