KX-DT590RU, KX-DT590RU-B - Panasonic Telephone Service Manual (repair manual). Page 2

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

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

2 Warning --------------------------------------------------------------4

2.1. Caution--------------------------------------------------------4
2.2. About Lead Free Solder (PbF: Pb free) --------------4

2.2.1. Suggested PbF Solder -------------------------------4

2.3. Discarding of P. C. Board --------------------------------4

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

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

4.2.1. Power supply circuit ----------------------------------6
4.2.2. Key Circuit-----------------------------------------------6
4.2.3. LED Circuit ----------------------------------------------7
4.2.4. Data Communication Circuit ------------------------8

5 Installation Instructions-----------------------------------------9

5.1. Disassembly Instructions---------------------------------9

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

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

7 Miscellaneous ---------------------------------------------------- 12

7.1. Terminal Guide of ICs, Transistors and Diodes --- 12
7.2. How To Replace a Flat Package IC ----------------- 13

7.2.1. Preparation-------------------------------------------- 13
7.2.2. Removal Procedure--------------------------------- 13
7.2.3. Procedure --------------------------------------------- 13
7.2.4. Removing Solder From Between Pins --------- 13

8 Schematic Diagram--------------------------------------------- 14

8.1. Main Board------------------------------------------------- 14
8.2. Waveform -------------------------------------------------- 16

9 Printed Circuit Board ------------------------------------------ 17

9.1. Component View ----------------------------------------- 17
9.2. Bottom View ----------------------------------------------- 18

10 Appendix Information of Schematic Diagram --------- 19

11 Exploded View and Replacement Parts List ----------- 20

11.1. IC Data------------------------------------------------------ 20
11.2. Accessories and Packing Material ------------------- 22
11.3. Cabinet and Electrical Parts --------------------------- 23
11.4. Replacement Parts List --------------------------------- 24

11.4.1. Cabinet and Electrical Parts ---------------------- 24
11.4.2. Accessories and Packing Materials------------- 24
11.4.3. Main Board Parts ------------------------------------ 24