KX-DT390RU - 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
2.2. Discarding of P. C. Board --------------------------------4

3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------5

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

5 Location of Controls and Components--------------------9

5.1. Location of Controls ---------------------------------------9
5.2. Connection---------------------------------------------------9

6 Troubleshooting Guide---------------------------------------- 10

6.1. No Operation ---------------------------------------------- 10
6.2. LED Does not Light -------------------------------------- 11

7 Disassembly and Assembly Instructions--------------- 12

7.1. Remove Main Board ------------------------------------ 12
7.2. Disassembly for Lower Cabinet Ass’y -------------- 13
7.3. Assembly for Lower Cabinet Ass’y  ----------------- 14

8 Miscellaneous ---------------------------------------------------- 16

8.1. Terminal Guide of ICs, Transistors and

Diodes------------------------------------------------------- 16

8.2. How To Replace a Flat Package IC ----------------- 17

9 Schematic Diagram--------------------------------------------- 18

9.1. Block Diagram -------------------------------------------- 18
9.2. Waveform -------------------------------------------------- 20
9.3. Memo-------------------------------------------------------- 21

10 Printed Circuit Board ------------------------------------------ 22

10.1. Component View ----------------------------------------- 22
10.2. Bottom View ----------------------------------------------- 23

11 Appendix Information of Schematic Diagram --------- 24

12 Exploded View and Replacement Parts  List ---------- 25

12.1. IC Data------------------------------------------------------ 25
12.2. Cabinet and Electrical Parts Location--------------- 27
12.3. Accessories and Packing Materials ----------------- 28
12.4. Replacement Parts List --------------------------------- 29