KX-TDA620BX (serv.man8) - Panasonic PBX Service Manual Supplement (repair manual). Page 2

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

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

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

2.1. Information for Users on Collection and

Disposal of Old Equipment and used Batteries-----3

2.2. Battery Caution ---------------------------------------------4
2.3. Caution--------------------------------------------------------4
2.4. About Lead Free Solder (PbF: Pb free) --------------4

2.4.1. Suggested PbF Solder -------------------------------4

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

3 Specifications ------------------------------------------------------5

3.1. General Description ---------------------------------------5
3.2. Characteristics ----------------------------------------------5

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

4.1. Block Diagram ----------------------------------------------6
4.2. BUS-S Card Circuit Operation --------------------------7

4.2.1. BUS-S Card---------------------------------------------7
4.2.2. Description of Each Part-----------------------------8
4.2.3. Circuit Description-------------------------------------9

4.3. Back Board Circuit Operation ------------------------- 11
4.4. Outline ------------------------------------------------------ 12

4.4.1. General Description--------------------------------- 12

4.5. System Control ------------------------------------------- 13

4.5.1. System Control Block Diagram ------------------ 13
4.5.2. Voice (TDM Highway) Bus Block Diagram---- 14
4.5.3. Voice Bus Logical Assignment ------------------- 15
4.5.4. TDM Signaling --------------------------------------- 15

4.6. Back Board Signal Connection Diagram ----------- 16

4.6.1. CT Bus System Connection Diagram ---------- 16
4.6.2. EC Bus System Connection Diagram ---------- 17
4.6.3. System Control and Analog Signal

Connection Diagram-------------------------------- 18

4.6.4. Power Supply System Connection

Diagram------------------------------------------------ 18

5 Location of Controls and Components------------------ 19

5.1. Name and Locations ------------------------------------ 19

5.1.1. Expansion System ---------------------------------- 19

6 Installation Instructions--------------------------------------- 23

6.1. System Overview----------------------------------------- 23

6.1.1. System Connection Diagram --------------------- 23

7 Operating Instructions ---------------------------------------- 25

7.1. System Capacity ----------------------------------------- 25

7.1.1. Number of Free Slots------------------------------- 25
7.1.2. Maximum Trunk and Extension ------------------ 25
7.1.3. Maximum Optional Service Cards -------------- 25
7.1.4. Maximum Terminal Equipment------------------- 26
7.1.5. Power Supply Unit Selection for Each

Shelf ---------------------------------------------------- 27

8 Troubleshooting Guide---------------------------------------- 29

8.1. BUS-S CARD --------------------------------------------- 29

9 Service Fixture & Tools--------------------------------------- 35

9.1. EXTENSION BOARDS FOR SERVICING -------- 35

10 Disassembly and Assembly Instructions -------------- 36

10.1. BUS-S Card ----------------------------------------------- 36
10.2. Back Board ------------------------------------------------ 37

11 Miscellaneous --------------------------------------------------- 39

11.1. How To Replace a Flat Package IC ----------------- 39

11.1.1. Preparation ------------------------------------------- 39
11.1.2. Removal Procedure -------------------------------- 39
11.1.3. Procedure--------------------------------------------- 39
11.1.4. Removing Solder From Between Pins--------- 39

12 Schematic Diagram -------------------------------------------- 40

12.1. BUS-S Block Diagram ---------------------------------- 40
12.2. BUS-S Board No.1 -------------------------------------- 41
12.3. BUS-S Board No.2 -------------------------------------- 42
12.4. BUS-S Board No.3 -------------------------------------- 43
12.5. BUS-S Board No.4 -------------------------------------- 44
12.6. BUS-S Board No.5 -------------------------------------- 45
12.7. BUS-S Board No.6 -------------------------------------- 46
12.8. BUS-S Board No.7 -------------------------------------- 47
12.9. BB-EXP Board No.1 ------------------------------------ 48

12.10. BB-EXP Board No.2 ------------------------------------ 50

12.11. BB-EXP Board No.3 ------------------------------------ 52

12.12. Waveform -------------------------------------------------- 54

13 Printed Circuit Board------------------------------------------ 55

13.1. BUS-S Board --------------------------------------------- 55

13.1.1. Component View ------------------------------------ 55

13.2. BB-EXP Board-------------------------------------------- 56

13.2.1. Component View ------------------------------------ 56

14 Appendix Information of Schematic Diagram -------- 57
15 Exploded View and Replacement Parts List----------- 58

15.1. Cabinet and Electrical Parts Location -------------- 58
15.2. Accessories and Packing Material ------------------ 60
15.3. Replacement Parts List -------------------------------- 61

15.3.1. Cabinet and Electrical Parts---------------------- 61
15.3.2. Accessories and Packing Materials ------------ 61
15.3.3. BBS-S Card Parts ---------------------------------- 62
15.3.4. BB-EXP Board Parts ------------------------------- 67
15.3.5. Fixtures and Tools ---------------------------------- 67