Panasonic KX-TGA740, Service Manual

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3
KX-TG7411MEB/KX-TG7412MEB/KX-TGA740MEB
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. Circuit Operation (RF Part)-----------------------------24
4.9. Circuit Operation (Charger Unit) ----------------------25
4.10. Signal Route -----------------------------------------------26
5 Location of Controls and Components ------------------ 27
5.1. Controls -----------------------------------------------------27
5.2. Display ------------------------------------------------------28
6 Installation Instructions --------------------------------------- 29
6.1. Connections------------------------------------------------29
6.2. Battery-------------------------------------------------------29
7 Operating Instructions ----------------------------------------- 31
7.1. Programmable Settings ---------------------------------31
7.2. Error Messages -------------------------------------------34
7.3. Troubleshooting-------------------------------------------35
8 Test Mode ---------------------------------------------------------- 38
8.1. Adjustment and Test Mode Flow Chart -------------38
9 Service Mode ----------------------------------------------------- 45
9.1. How to Clear User Setting------------------------------45
10 Troubleshooting Guide ---------------------------------------- 46
10.1. Troubleshooting Flowchart -----------------------------46
11 Disassembly and Assembly Instructions --------------- 57
11.1. Disassembly Instructions -------------------------------57
11.2. How to Replace the Handset LCD -------------------60
12 Measurements and Adjustments --------------------------- 62
12.1. Things to Do after Replacing IC or X’tal ------------62
12.2. Base Unit Reference Drawing-------------------------63
12.3. Handset Reference Drawing---------------------------64
12.4. Frequency Table ------------------------------------------65
13 Miscellaneous ---------------------------------------------------- 66
13.1. CPU Data (Base Unit) -----------------------------------66
13.2. CPU Data (Handset)-------------------------------------67
13.3. Explanation of IC Terminals (RF Part)---------------68
13.4. How to Replace the Flat Package IC ----------------69
13.5. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------71
13.6. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------74
14 Schematic Diagram --------------------------------------------- 75
14.1. For Schematic Diagram---------------------------------75
14.2. Schematic Diagram (Base Unit_Main) --------------76
14.3. Schematic Diagram (Base Unit_RF Part) ----------78
14.4. Schematic Diagram (Handset_Main) ----------------80
14.5. Schematic Diagram (Handset_RF Part) ------------82
14.6. Schematic Diagram (Charger Unit) -----------------84
15 Printed Circuit Board ------------------------------------------ 85
15.1. Circuit Board (Base Unit_Main) ---------------------- 85
15.2. Circuit Board (Base Unit_RF Part)------------------- 87
15.3. Circuit Board (Handset_Main) ------------------------ 88
15.4. Circuit Board (Handset_RF Part) -------------------- 90
15.5. Circuit Board (Charger Unit)--------------------------- 91
16 Exploded View and Replacement Parts List ----------- 92
16.1. Cabinet and Electrical Parts (Base Unit) ----------- 92
16.2. Cabinet and Electrical Parts (Handset)------------- 93
16.3. Cabinet and Electrical Parts (Charger Unit) ------- 94
16.4. Accessories and Packing Materials ----------------- 95
16.5. Replacement Parts List--------------------------------- 98