KX-NT400RU - 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

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

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

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

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

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

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

4.2.1. Main-CPU (IC1)----------------------------------------7
4.2.2. Application-CPU (IC101) ----------------------------7
4.2.3. LED Circuit ----------------------------------------------7
4.2.4. Backlight Circuit----------------------------------------8
4.2.5. TouchPanel I/F Circuit--------------------------------8
4.2.6. Reset Circuit --------------------------------------------9
4.2.7. Ethernet Circuit -------------------------------------- 10
4.2.8. Analog Circuit ---------------------------------------- 11
4.2.9. Sub-CPU(IC4)---------------------------------------- 13

4.2.10. KEY Input Control Circuit-------------------------- 14

4.2.11. LED Circuit -------------------------------------------- 15

4.2.12. Power Supply Circuit ------------------------------- 16
4.2.13. Bluetooth I/F Circuit--------------------------------- 17
4.2.14. SD Card I/F Circuit ---------------------------------- 17
4.2.15. USB I/F Circuit --------------------------------------- 18

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

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

5.1.1. Front View--------------------------------------------- 19
5.1.2. Right Side View -------------------------------------- 20
5.1.3. Left Side View ---------------------------------------- 20
5.1.4. Back View --------------------------------------------- 21
5.1.5. Bottom View ------------------------------------------ 21

6 Installation Instructions--------------------------------------- 22
7 Troubleshooting Guide---------------------------------------- 23

7.1. No Operation ---------------------------------------------- 23

7.1.1. Power Supply : AC adaptor ----------------------- 23
7.1.2. Power Supply : PoE Hub -------------------------- 23

7.2. LCD Does Not work ------------------------------------- 27
7.3. Touch Panel Does Not work--------------------------- 28
7.4. Sound of Tap Screen Does Not work --------------- 29
7.5. Handset Does Not work -------------------------------- 30

7.5.1. Receive ------------------------------------------------ 30
7.5.2. Send ---------------------------------------------------- 30

7.6. Headset Does Not work -------------------------------- 31

7.6.1. Receive ------------------------------------------------ 31
7.6.2. Send ---------------------------------------------------- 31

7.7. Speaker-Phone Does Not work----------------------- 32

7.7.1. Receive ------------------------------------------------ 32
7.7.2. Send ---------------------------------------------------- 32

7.8. Ethernet Does Not work -------------------------------- 33

7.8.1. LAN port ----------------------------------------------- 33
7.8.2. PC port ------------------------------------------------- 34
7.8.3. Internal MII connection----------------------------- 35
7.8.4. PoE (Power over Ethernet) ----------------------- 35

7.9. LED Does Not Light ------------------------------------- 36

7.10. Bluetooth Does Not work------------------------------- 36

7.11. USB Port does not work-------------------------------- 37

7.12. SD Card does not work -------------------------------- 37

8 Disassembly and Assembly Instructions -------------- 38

8.1. Remove Main Board and Jack Board -------------- 38
8.2. Disassembly for Lower Cabinet Ass’y-------------- 40
8.3. Disassembly for Stand Ass’y-------------------------- 40
8.4. Assembly for Lower Cabinet Ass’y  ----------------- 41

9 Miscellaneous --------------------------------------------------- 44

9.1. Terminal Guide of the ICs Transistors and

Diodes ------------------------------------------------------ 44

9.2. How To Replace a Flat Package IC----------------- 46

9.2.1. Preparation ------------------------------------------- 46
9.2.2. Removal Procedure -------------------------------- 46
9.2.3. Procedure--------------------------------------------- 46
9.2.4. Removing Solder From Between Pins--------- 46

9.3. Memo ------------------------------------------------------- 47

10 Schematic Diagram -------------------------------------------- 48

10.1. Main Board ------------------------------------------------ 48

10.1.1. L2SW , PoE , Power DC -------------------------- 48
10.1.2. VoIP ---------------------------------------------------- 52
10.1.3. Analog Interface------------------------------------- 54
10.1.4. SUB-CPU , LED , KEY SCAN , Bluetooth

Interface ----------------------------------------------- 56

10.1.5. CE (X-Scale) ----------------------------------------- 58
10.1.6. Power , LCD Interface , JK Board Interface -- 62

10.2. Sub Board ------------------------------------------------- 64
10.3. Waveform-------------------------------------------------- 65

11 Printed Circuit Board------------------------------------------ 71

11.1. Main Board ------------------------------------------------ 71

11.1.1. Component View------------------------------------ 71
11.1.2. Bottom View------------------------------------------ 72

11.2. Sub1 Board------------------------------------------------ 73

11.2.1. Component View------------------------------------ 73
11.2.2. Bottom View------------------------------------------ 74

11.3. Sub2 Board------------------------------------------------ 75

11.3.1. Component View------------------------------------ 75
11.3.2. Bottom View------------------------------------------ 75

12 Appendix Information of Schematic Diagram -------- 76
13 Exploded View and Replacement Parts List----------- 77

13.1. IC Data ----------------------------------------------------- 77

13.1.1. IC1 (VoIP)--------------------------------------------- 77
13.1.2. IC5 (Ethernet)---------------------------------------- 81
13.1.3. IC111 (DODEC) ------------------------------------- 84
13.1.4. IC107 (MAC/PHY) ---------------------------------- 85
13.1.5. IC120 (LED driver)---------------------------------- 86
13.1.6. IC7 (PoE) --------------------------------------------- 88
13.1.7. IC101 (XScale) -------------------------------------- 89

13.2. Cabinet and Electric Parts----------------------------- 98
13.3. Accessories and Packing Materials----------------- 99
13.4. Replacement Parts List ------------------------------- 100

13.4.1. Cabinet and Electrical Parts---------------------100
13.4.2. Accessories and Packing Materials -----------100
13.4.3. Main Board Parts ----------------------------------101
13.4.4. Jack Board Parts-----------------------------------108