Panasonic KX-TG6641B, Service Manual, Page: 3 / 99

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KX-TG6641B/KX-TG6643B/KX-TG6644B/KX-TG6645B/KX-TGA660B
TABLE OF CONTENTS
PAGE PAGE
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. US-DECT Description ------------------------------------ 7
4.2. Block Diagram (Base Unit_Main)---------------------- 9
4.3. Block Diagram (Base Unit_RF Part) -----------------10
4.4. Circuit Operation (Base Unit)-------------------------- 11
4.5. Block Diagram (Handset)-------------------------------18
4.6. Block Diagram (Handset_RF Part)-------------------19
4.7. Circuit Operation (Handset)----------------------------20
4.8. Behavior of Electric Power Failure -------------------22
4.9. Circuit Operation (Charger Unit) ----------------------22
4.10. Signal Route -----------------------------------------------23
5 Location of Controls and Components ------------------ 25
6 Installation Instructions --------------------------------------- 25
7 Operating Instructions ----------------------------------------- 25
8 Test Mode ---------------------------------------------------------- 26
8.1. Engineering Mode ----------------------------------------26
9 Service Mode ----------------------------------------------------- 30
9.1. How to Clear User Setting (Handset Only)---------30
10 Troubleshooting Guide ---------------------------------------- 31
10.1. Troubleshooting Flowchart -----------------------------31
11 Disassembly and Assembly Instructions --------------- 45
11.1. Disassembly Instructions -------------------------------45
11.2. How to Attach the Antenna-----------------------------49
11.3. How to Replace the Base Unit LCD -----------------50
11.4. How to Replace the Handset LCD -------------------52
12 Measurements and Adjustments --------------------------- 53
12.1. Equipment Required -------------------------------------53
12.2. The Setting Method of JIG -----------------------------53
12.3. Adjustment Standard (Base Unit)---------------------57
12.4. Adjustment Standard (Charger Unit)-----------------58
12.5. Adjustment Standard (Handset) ----------------------59
12.6. Things to Do after Replacing IC or X'tal ------------60
12.7. Frequency Table ------------------------------------------62
13 Miscellaneous ---------------------------------------------------- 63
13.1. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------63
13.2. How to Replace the Flat Package IC ----------------65
13.3. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------67
14 Schematic Diagram --------------------------------------------- 68
14.1. For Schematic Diagram---------------------------------68
14.2. Schematic Diagram (Base Unit_Main) --------------70
14.3. Schematic Diagram (Base Unit_Operation) -------72
14.4. Schematic Diagram (Base Unit_LED)---------------73
14.5. Schematic Diagram (Handset_Main) ----------------74
14.6. Schematic Diagram (Handset_LED)-----------------76
14.7. Schematic Diagram (Charger Unit) -----------------77
15 Printed Circuit Board ------------------------------------------- 79
15.1. Circuit Board (Base Unit_Main)-----------------------79
15.2. Circuit Board (Base Unit_Operation) ----------------81
15.3. Circuit Board (Base Unit_LED)------------------------82
15.4. Circuit Board (Handset_Main) ------------------------ 83
15.5. Circuit Board (Handset_LED)------------------------- 85
15.6. Circuit Board (Charger Unit)--------------------------- 86
16 Exploded View and Replacement Parts List ----------- 87
16.1. Cabinet and Electrical Parts (Base Unit) ----------- 87
16.2. Cabinet and Electrical Parts (Handset)------------- 88
16.3. Cabinet and Electrical Parts (Charger Unit) ------- 89
16.4. Accessories and Packing Materials ----------------- 90
16.5. Replacement Parts List--------------------------------- 95