KX-NT543RU, KX-NT543RU-B, KX-NT546RU, KX-NT546RU-B (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 --------------------------------------------------------------4

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

2.1.1. Suggested PbF Solder -------------------------------4

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

3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------6

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

4.2.1. LCD Circuit----------------------------------------------7
4.2.2. Reset Circuit --------------------------------------------7
4.2.3. Ethernet Circuit ----------------------------------------8
4.2.4. Analog Circuit ------------------------------------------8
4.2.5. ASIC (IC205) ----------------------------------------- 10
4.2.6. Key Circuit--------------------------------------------- 11
4.2.7. LED Circuit -------------------------------------------- 12
4.2.8. EHS Circuit-------------------------------------------- 13
4.2.9. Power Supply Circuit ------------------------------- 14

5 Location of Controls and Components------------------ 15

5.1. Name and Locations ------------------------------------ 15

6 Installation Instructions--------------------------------------- 16

6.1. Connections ----------------------------------------------- 16

7 Test Mode---------------------------------------------------------- 18

7.1. Loopback Test Mode ------------------------------------ 18

7.1.1. Preparation-------------------------------------------- 18
7.1.2. Communication Test -------------------------------- 18
7.1.3. Quit Test Mode for communication test  ------- 18

7.2. KEYs and LEDs Test mode---------------------------- 19

7.2.1. Preparation-------------------------------------------- 19
7.2.2. KEYs and LEDs Test ------------------------------- 19
7.2.3. Quit KEYs and LEDs Test mode----------------- 19

8 Service Mode ----------------------------------------------------- 20

8.1. Factory Setting-------------------------------------------- 20

8.1.1. How to Clear User Setting ------------------------ 20

8.2. How to Change MAC Address Label---------------- 20

8.2.1. Replacing Main P.C.B. ----------------------------- 20
8.2.2. Attaching MAC Address Label ------------------- 21

9 Troubleshooting Guide---------------------------------------- 22

9.1. No Operation ---------------------------------------------- 22

9.1.1. Power ON Error-------------------------------------- 22
9.1.2. Power Supply : AC adaptor ----------------------- 22
9.1.3. Power Supply : PoE -------------------------------- 23

9.2. LCD Does Not Operate--------------------------------- 30
9.3. ASIC Does Not Work------------------------------------ 31

9.3.1. ASIC Data Error ------------------------------------- 31

9.4. Handset Does Not work -------------------------------- 32

9.4.1. Receive ------------------------------------------------ 32
9.4.2. Send ---------------------------------------------------- 32

9.5. Headset Does Not work -------------------------------- 33

9.5.1. Receive ------------------------------------------------ 33
9.5.2. Send ---------------------------------------------------- 33

9.6. Speaker-Phone Does Not Work ---------------------- 34

9.6.1. Receive ------------------------------------------------ 34
9.6.2. Send ---------------------------------------------------- 34

9.7. Ethernet Does Not work -------------------------------- 35

9.7.1. PHY Data Error -------------------------------------- 35
9.7.2. LAN port ----------------------------------------------- 36

9.7.3. PC port ------------------------------------------------ 36

9.8. LED Does Not Light------------------------------------- 37
9.9. EHS Does Not Work ------------------------------------ 38

10 Disassembly and Assembly Instructions -------------- 39

10.1. Remove Main Board and Ope Board--------------- 39
10.2. Remove and Assembly for LCD  -------------------- 40
10.3. Assembly for Lead wire -------------------------------- 41

11 Maintenance------------------------------------------------------ 42

11.1. Terminal Guide of the ICs Transistors and

Diodes ------------------------------------------------------ 42

11.1.1. Main Board ------------------------------------------- 42
11.1.2. Operation Board------------------------------------- 42

11.2. How To Replace a Flat Package IC----------------- 43

11.2.1. Preparation ------------------------------------------- 43
11.2.2. Removal Procedure -------------------------------- 43
11.2.3. Procedure--------------------------------------------- 43
11.2.4. Removing Solder From Between Pins--------- 43

12 Schematic Diagram -------------------------------------------- 44

12.1. Main No.1-------------------------------------------------- 44
12.2. Main No.2-------------------------------------------------- 48
12.3. Main No.3-------------------------------------------------- 50

12.3.1. Memo -------------------------------------------------- 51

12.4. Main No.4-------------------------------------------------- 52
12.5. Ope---------------------------------------------------------- 54
12.6. Waveform-------------------------------------------------- 56

12.6.1. No.(1)-(6)---------------------------------------------- 56
12.6.2.  No.(7)-(12) ------------------------------------------- 57
12.6.3. No.(13)-(17) ------------------------------------------ 58

13 Printed Circuit Board------------------------------------------ 59

13.1. Main Board ------------------------------------------------ 59

13.1.1. Component View------------------------------------ 59
13.1.2. Flow Solder Side View----------------------------- 60

13.2. Operation Board ----------------------------------------- 61

13.2.1. Component View------------------------------------ 61

14 Appendix Information of Schematic Diagram -------- 62
15 Exploded View and Replacement Parts List----------- 63

15.1. IC Data ----------------------------------------------------- 63

15.1.1. IC501--------------------------------------------------- 63
15.1.2. IC205--------------------------------------------------- 66
15.1.3. IC401--------------------------------------------------- 67

15.2. Cabinet and Electric Parts----------------------------- 69
15.3. Accessories and Packing Materials----------------- 70
15.4. Replacement Parts List -------------------------------- 71

15.4.1. Cabinet and Electrical Parts---------------------- 71
15.4.2. Accessories and Packing Materials ------------ 72
15.4.3. Main Board Parts ----------------------------------- 72
15.4.4. Ope Board Parts ------------------------------------ 79