Table Of Contents - Panasonic KX-TG7741S Service Manual

TABLE OF CONTENTS

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. Circuit Configuration
Phones ------------------------------------------------------- 7
4.2. US-DECT Description ------------------------------------ 8
4.3. Block Diagram (Base Unit_Main)---------------------10
4.4. Tel Interface Circuit--------------------------------------- 11
4.5. Block Diagram (Base Unit_RF Part) -----------------12
4.6. Circuit Operation (Base Unit) --------------------------13
4.7. Block Diagram (Handset)-------------------------------20
4.8. Block Diagram (Handset_RF Part)-------------------21
4.9. Circuit Operation (Handset)----------------------------22
4.10. Circuit Operation (Charger Unit) ----------------------23
4.11. Signal Route -----------------------------------------------24
5 Location of Controls and Components ------------------26
6 Installation Instructions ---------------------------------------26
7 Operating Instructions-----------------------------------------26
8 Test Mode ----------------------------------------------------------27
8.1. Engineering Mode ----------------------------------------27
9 Service Mode -----------------------------------------------------31
9.1. How to Clear User Setting (Handset Only)---------31
10 Troubleshooting Guide ----------------------------------------32
10.1. Troubleshooting Flowchart -----------------------------32
11 Disassembly and Assembly Instructions ---------------48
11.1. Disassembly Instructions -------------------------------48
11.2. How to Replace the Base unit LCD ------------------52
11.3. How to Replace the Handset LCD -------------------54
12 Measurements and Adjustments---------------------------55
12.1. Equipment Required -------------------------------------55
12.2. The Setting Method of JIG -----------------------------55
12.3. Adjustment Standard (Base Unit)---------------------59
12.4. Adjustment Standard (Charger Unit)-----------------60
12.5. Adjustment Standard (Handset) ----------------------61
12.6. Things to Do after Replacing IC or X'tal ------------62
12.7. Frequency Table ------------------------------------------64
12.8. Bluetooth Frequency Table-----------------------------65
13 Miscellaneous ----------------------------------------------------66
13.1. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------66
13.2. How to Replace the Flat Package IC ----------------68
13.3. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------70
14 Schematic Diagram ---------------------------------------------71
14.1. For Schematic Diagram---------------------------------71
14.2. Schematic Diagram (Base Unit_Main) --------------72
14.3. Schematic Diagram (Base Unit_RF)-----------------74
14.4. Schematic Diagram (Base Unit_Operation) -------75
14.5. Schematic Diagram (Handset_Main) ----------------76
14.6. Schematic Diagram (Handset_LED)-----------------78
14.7. Schematic Diagram (Charger Unit) -----------------79
15 Printed Circuit Board-------------------------------------------81
15.1. Circuit Board (Base Unit_Main) -----------------------81
PAGE
of TG774x Series
3
KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S
15.2. Circuit Board (Base Unit_Operation)---------------- 83
15.3. Circuit Board (Handset_Main) ------------------------ 84
15.4. Circuit Board (Handset_LED) ------------------------- 86
15.5. Circuit Board (Charger Unit)--------------------------- 87
16 Exploded View and Replacement Parts List ----------- 88
16.1. Cabinet and Electrical Parts (Base Unit) ----------- 88
16.2. Cabinet and Electrical Parts (Handset)------------- 89
16.3. Cabinet and Electrical Parts (Charger Unit) ------- 90
16.4. Accessories and Packing Materials ----------------- 91
16.5. Replacement Parts List--------------------------------- 95
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