KX-NT551RU-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. 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 (Main LCD/Selflabeling LCD) ------7
4.2.2. Reset Circuit --------------------------------------------8
4.2.3. Ethernet Circuit ----------------------------------------8
4.2.4. Analog Circuit ------------------------------------------9
4.2.5. ASIC (IC205) ----------------------------------------- 11
4.2.6. Key Circuit--------------------------------------------- 12
4.2.7. LED Circuit -------------------------------------------- 14
4.2.8. Power Supply Circuit ------------------------------- 15

5 Location of Controls and Components------------------ 16

5.1. Name and Locations ------------------------------------ 16

6 Installation Instructions--------------------------------------- 17

6.1. Connections ----------------------------------------------- 17

7 Test Mode---------------------------------------------------------- 19

7.1. Loopback Test Mode ------------------------------------ 19

7.1.1. Preparation-------------------------------------------- 19
7.1.2. Communication Test -------------------------------- 19
7.1.3. Quit Test Mode for communication test  ------- 19

7.2. KEYs and LEDs Test mode---------------------------- 20

7.2.1. Preparation-------------------------------------------- 20
7.2.2. KEYs and LEDs Test ------------------------------- 20
7.2.3. Quit KEYs and LEDs Test mode----------------- 20

8 Service Mode ----------------------------------------------------- 21

8.1. Factory Setting-------------------------------------------- 21

8.1.1. How to Clear User Setting ------------------------ 21

8.2. How to Change MAC Address Label---------------- 21

8.2.1. Replacing Main P.C.B. ----------------------------- 21
8.2.2. Attaching MAC Address Label ------------------- 22

9 Troubleshooting Guide --------------------------------------- 23

9.1. No Operation ---------------------------------------------- 23

9.1.1. Power ON Error-------------------------------------- 23
9.1.2. Power Supply : AC adaptor ----------------------- 23
9.1.3. Power Supply : PoE -------------------------------- 24

9.2. Main LCD Does Not Operate ------------------------- 31
9.3. ASIC Does Not Work------------------------------------ 32

9.3.1. ASIC Data Error ------------------------------------- 32

9.4. Handset Does Not work -------------------------------- 33

9.4.1. Receive ------------------------------------------------ 33
9.4.2. Send ---------------------------------------------------- 33

9.5. Headset Does Not work -------------------------------- 34

9.5.1. Receive ------------------------------------------------ 34
9.5.2. Send ---------------------------------------------------- 34

9.6. Speaker-Phone Does Not Work ---------------------- 35

9.6.1. Receive ------------------------------------------------ 35
9.6.2. Send ---------------------------------------------------- 35

9.7. Ethernet Does Not work -------------------------------- 36

9.7.1. PHY Data Error -------------------------------------- 36
9.7.2. LAN port ----------------------------------------------- 37
9.7.3. PC port ------------------------------------------------- 37

9.8. LED Does Not Light --------------------------------------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---------------------------------------------------52
12.4. Main No.4---------------------------------------------------56
12.5. Ope-----------------------------------------------------------60
12.6. Waveform---------------------------------------------------64

12.6.1. No.(1)-(6)-----------------------------------------------64
12.6.2.  No.(7)-(10) --------------------------------------------65
12.6.3. No.(11)-(15-(1)) ---------------------------------------66
12.6.4. No.(15(2)-19(1)) --------------------------------------67
12.6.5. No.(19(2))-(22)----------------------------------------68

13 Printed Circuit Board-------------------------------------------69

13.1. Main Board -------------------------------------------------69

13.1.1. Component View-------------------------------------69
13.1.2. Flow Solder Side View------------------------------70

13.2. Operation Board ------------------------------------------71
13.3. MIC Board --------------------------------------------------72

14 Appendix Information of Schematic Diagram ---------73
15 Exploded View and Replacement Parts List------------74

15.1. IC Data ------------------------------------------------------74

15.1.1. IC502----------------------------------------------------74
15.1.2. IC301----------------------------------------------------80

15.2. Cabinet and Electric Parts------------------------------83
15.3. Accessories and Packing Materials------------------84
15.4. Replacement Parts List ---------------------------------85

15.4.1. Cabinet and Electrical Parts-----------------------85
15.4.2. Accessories and Packing Materials -------------85
15.4.3. Main Board Parts ------------------------------------85
15.4.4. Ope Board Parts -------------------------------------89