KX-NS500RU (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 2

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1 Safety Precautions -----------------------------------------------4

1.1. For Service Technicians  ---------------------------------4
1.2. Insulation Resistance Test -------------------------------4

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

2.1. Battery Caution ---------------------------------------------4
2.2. Caution--------------------------------------------------------4
2.3. About Lead Free Solder (PbF: Pb free) --------------5

2.3.1. Suggested PbF Solder -------------------------------5

2.4. Discarding of P. C. Board --------------------------------5

3 Specifications ------------------------------------------------------6

3.1. General Description ---------------------------------------6
3.2. Characterstics-----------------------------------------------6

4 Technical Descriptions------------------------------------------7

4.1. Block Diagram ----------------------------------------------7
4.2. Main Unit -----------------------------------------------------9

4.2.1. CPU Board (MPR) ------------------------------------9
4.2.2. Main Unit Mother Board --------------------------- 10
4.2.3. SLIC/CODEC (SLC) Block ------------------------ 10
4.2.4. DSP (LCOT) Block ---------------------------------- 10
4.2.5. DPT I/F Block----------------------------------------- 10

4.3. Expansion Unit-------------------------------------------- 11

4.3.1. CPU Board (SPR)  ---------------------------------- 11
4.3.2. Expansion Unit Mother Board -------------------- 12
4.3.3. SLIC/CODEC (SLC) Block ------------------------ 12

4.4. Power Circuit ---------------------------------------------- 13
4.5. Power Supply Unit --------------------------------------- 14

4.5.1. Block Diagram and Circuit Description of

PSU ----------------------------------------------------- 14

4.6. AC input, Rectification Smoothing Circuit ---------- 14
4.7. Main Converter ------------------------------------------- 15
4.8. Output voltage -------------------------------------------- 16
4.9. Battery voltage input and output---------------------- 18

4.10. Alarm Signal Sending Circuit-------------------------- 19

4.11. Protection Circuit ----------------------------------------- 20

5 Location of Controls and Components ------------------ 21

5.1. Name and Locations ------------------------------------ 21

6 Installation Instructions--------------------------------------- 22

6.1. System Components ------------------------------------ 22

7 Operating Instructions ---------------------------------------- 22

7.1. System Capacity ----------------------------------------- 22

8 Test Mode ---------------------------------------------------------- 22

8.1. Utility--------------------------------------------------------- 22

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

9.1. MPR/SPR/Mother Board ------------------------------- 23

9.1.1. Startup-------------------------------------------------- 24
9.1.2. Battery Alarm ----------------------------------------- 28
9.1.3. Using Voice Mail ------------------------------------- 29
9.1.4. Others -------------------------------------------------- 31
9.1.5. SLIC/CODEC (SLC) Block ------------------------ 31
9.1.6. DSP (LCOT) Block ---------------------------------- 31
9.1.7. DPT I/F Block----------------------------------------- 31

9.2. Power Supply --------------------------------------------- 32

9.2.1. No Voltage is Output at All (1)-------------------- 32
9.2.2. No voltage is Output at All (2) -------------------- 33
9.2.3. 41V are Not Output --------------------------------- 34
9.2.4. Battery Backup Function Does Not

Operate / PSU can Not Charge Batteries ----- 35

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

10.1. Mother Board and CPU Board ----------------------- 36
10.2. Fan and Power Supply Board ------------------------ 37

11 Miscellaneous --------------------------------------------------- 38

11.1. How To Replace a Flat Package IC ----------------- 38

11.1.1. Preparation ------------------------------------------- 38
11.1.2. Removal Procedure -------------------------------- 38
11.1.3. Procedure--------------------------------------------- 38
11.1.4. Removing Solder From Between Pins--------- 38

11.2. How to Replace the LLP (Leadless Leadframe

Package) IC and IC ground plate-------------------- 39

11.2.1. Preparation ------------------------------------------- 39
11.2.2. Caution ------------------------------------------------ 39
11.2.3. How to Remove the IC ---------------------------- 39
11.2.4. How to Install the IC -------------------------------- 39
11.2.5. How to Remove a Solder Bridge (Doesn't

apply to IC ground plate.) ------------------------- 40

11.3. Terminal Guide of the ICs, Transistors and

Diodes ------------------------------------------------------ 41

11.3.1. Mother Board ---------------------------------------- 41
11.3.2. CPU Board ------------------------------------------- 42
11.3.3. Power Supply Board ------------------------------- 43

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

12.1. Mother Board --------------------------------------------- 44

12.1.1. No.1 ---------------------------------------------------- 44
12.1.2. No.2 ---------------------------------------------------- 46
12.1.3. No.3 ---------------------------------------------------- 48
12.1.4. No.4 ---------------------------------------------------- 50
12.1.5. No.5 ---------------------------------------------------- 52
12.1.6. No.6 ---------------------------------------------------- 54
12.1.7. No.7 ---------------------------------------------------- 56

12.2. Memo ------------------------------------------------------- 59
12.3. CPU Board ------------------------------------------------ 60

12.3.1. No.1 ---------------------------------------------------- 60
12.3.2. No.2 ---------------------------------------------------- 62
12.3.3. No.3 ---------------------------------------------------- 64
12.3.4. No.4 ---------------------------------------------------- 66
12.3.5. No.5 ---------------------------------------------------- 68
12.3.6. No.6 ---------------------------------------------------- 70

12.4. Relay Board ----------------------------------------------- 72
12.5. Memo ------------------------------------------------------- 73
12.6. Power Supply Board ------------------------------------ 74
12.7. Waveform -------------------------------------------------- 78

12.7.1. CPU Board Voltage--------------------------------- 78
12.7.2. CPU Board Reset Signal-------------------------- 81
12.7.3. CPU Board Clock ----------------------------------- 83
12.7.4. CPU Board NAND Access------------------------ 85
12.7.5. CPU Board SRAM Access ----------------------- 87
12.7.6. Power Supply Board ------------------------------- 88

13 Printed Circuit Board------------------------------------------ 89

13.1. Mother Board --------------------------------------------- 89

13.1.1. Component View ------------------------------------ 89
13.1.2. Bottom View ------------------------------------------ 90

13.2. CPU Board ------------------------------------------------ 91

13.2.1. Component View ------------------------------------ 91
13.2.2. Bottom View ------------------------------------------ 92

13.3. Relay Board ----------------------------------------------- 93

13.3.1. Component View ------------------------------------ 93
13.3.2. Bottom View ------------------------------------------ 93