KX-TG6461CAT, KX-TGA641RUT - Panasonic Telephone Service Manual (repair manual). Page 3

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

1.1. For Service Technicians --------------------------------- 4

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

2.1. Battery Caution--------------------------------------------- 4
2.2. About Lead Free Solder (Pbf: Pb free)--------------- 4
2.3. Discarding of P. C. Board-------------------------------- 5

3 Specifications ----------------------------------------------------- 6
4 Technical Descriptions ----------------------------------------- 7

4.1. Block Diagram (Base Unit) ------------------------------ 7
4.2. Circuit Operation (Base Unit) --------------------------- 8
4.3. Block Diagram (Cordless Handset) ------------------12
4.4. Circuit Operation (Cordless Handset) ---------------13
4.5. Circuit Operation (Charger Unit) ----------------------14
4.6. Signal Route -----------------------------------------------15

5 Location of Controls and Components ------------------18
6 Installation Instructions ---------------------------------------18
7 Operating Instructions-----------------------------------------18

7.1. Programmable Settings ---------------------------------18
7.2. For Service Hint-------------------------------------------18

8 Service Mode -----------------------------------------------------19

8.1. Engineering Mode ----------------------------------------19
8.2. Copying Phonebook Items when Repairing -------23
8.3. How to Clear User Setting------------------------------25

9 Troubleshooting Guide ----------------------------------------26

9.1. Troubleshooting Flowchart -----------------------------26
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------38

9.3. Troubleshooting by Symptom (Cordless

Handset) ----------------------------------------------------42

10 Disassembly and Assembly Instructions ---------------46

10.1. Disassembly Instructions -------------------------------46
10.2. Assembly Instructions -----------------------------------50

11 Measurements and Adjustments---------------------------52

11.1. Equipment Required -------------------------------------52
11.2. The Setting Method of JIG (Base Unit) -------------52
11.3. Adjustment Standard (Base Unit)---------------------54
11.4. Adjustment Standard (Charger Unit)-----------------55
11.5. The Setting Method of JIG (Cordless

Handset) ----------------------------------------------------56

11.6. Adjustment Standard (Cordless Handset)----------58
11.7. Things to Do after Replacing IC or X'tal ------------59
11.8. RF Specification-------------------------------------------61
11.9. How to Check the Cordless Handset Speaker

or Receiver -------------------------------------------------62

11.10. Frequency Table (MHz) ---------------------------------62

12 Miscellaneous ----------------------------------------------------63

12.1. How to Replace the Flat Package IC----------------63
12.2. How to Replace the Shield Case ---------------------65
12.3. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------67

12.4. Terminal Guide of the ICs, Transistors and

Diodes -------------------------------------------------------69

13 Schematic Diagram ---------------------------------------------71

13.1. For Schematic Diagram---------------------------------71
13.2. Schematic Diagram (Base Unit_Main) --------------72
13.3. Schematic Diagram (Base Unit_RF Part) ----------74
13.4. Schematic Diagram (Base Unit_Operation) -------75
13.5. Schematic Diagram (Cordless Handset) -----------76

13.6. Schematic Diagram (Charger Unit)------------------ 78

14 Printed Circuit Board ------------------------------------------ 79

14.1. Circuit Board (Base Unit_Main) ---------------------- 79
14.2. Circuit Board (Base Unit_Operation)---------------- 81
14.3. Circuit Board (Cordless Handset)-------------------- 83
14.4. Circuit Board (Charger Unit)--------------------------- 85

15 Exploded View and Replacement Parts List ----------- 86

15.1. Cabinet and Electrical Parts (Base Unit) ----------- 86
15.2. Cabinet and Electrical Parts (Cordless

Handset)---------------------------------------------------- 87

15.3. Cabinet and Electrical Parts (Charger Unit) ------- 88
15.4. Accessories and Packing Materials ----------------- 89
15.5. Replacement Parts List--------------------------------- 91