Table Of Contents - Panasonic KX-TG8421FXB 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. Block Diagram (Base Unit) ------------------------------ 7
4.2. Circuit Operation (Base Unit) --------------------------- 8
4.3. Block Diagram (Handset)------------------------------- 11
4.4. Circuit Operation (Handset)----------------------------12
4.5. Circuit Operation (Charger Unit) ----------------------13
4.6. Signal Route -----------------------------------------------14
5 Location of Controls and Components ------------------16
5.1. Controls -----------------------------------------------------16
6 Installation Instructions ---------------------------------------17
6.1. Connections------------------------------------------------17
6.2. Battery-------------------------------------------------------17
7 Operating Instructions-----------------------------------------19
7.1. Programmable Settings ---------------------------------19
7.2. Registering a Handset to a Base Unit ---------------22
7.3. Copying Phonebook Entries ---------------------------23
7.4. Dialling mode ----------------------------------------------23
7.5. Error Messages -------------------------------------------23
7.6. Troubleshooting -------------------------------------------24
7.7. For Service Hint-------------------------------------------28
8 Service Mode -----------------------------------------------------29
8.1. Engineering Mode ----------------------------------------29
8.2. Copying Phonebook Items when Repairing -------33
8.3. How to Clear User Setting------------------------------35
9 Troubleshooting Guide ----------------------------------------36
9.1. Troubleshooting Flowchart -----------------------------36
9.2. Troubleshooting by Symptom (Base Unit and
Charger Unit) ----------------------------------------------48
9.3. Troubleshooting by Symptom (Handset) -----------52
10 Disassembly and Assembly Instructions ---------------56
10.1. Disassembly Instructions -------------------------------56
10.2. How to Replace the Handset LCD -------------------60
11 Measurements and Adjustments---------------------------61
11.1. Equipment Required -------------------------------------61
11.2. The Setting Method of JIG (Base Unit) -------------61
11.3. Adjustment Standard (Base Unit)---------------------63
11.4. Adjustment Standard (Charger Unit)-----------------64
11.5. The Setting Method of JIG (Handset) ---------------65
11.6. Adjustment Standard (Handset) ----------------------67
11.7. Things to Do after Replacing IC or X'tal ------------68
11.8. RF Specification-------------------------------------------70
11.9. How to Check the Handset Speaker or
Receiver ----------------------------------------------------71
11.10. Frequency Table (MHz) ---------------------------------71
12 Miscellaneous ----------------------------------------------------72
12.1. CPU Data (Base Unit) -----------------------------------72
12.2. CPU Data (Handset)-------------------------------------74
12.3. How to Replace the Flat Package IC ----------------76
12.4. How to Replace the LLP (Leadless Leadframe
Package) IC------------------------------------------------78
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12.5. Terminal Guide of the ICs, Transistors and
Diodes ------------------------------------------------------ 80
13 Schematic Diagram -------------------------------------------- 81
13.1. For Schematic Diagram -------------------------------- 81
13.2. Schematic Diagram (Base Unit)---------------------- 82
13.3. Schematic Diagram (Base Unit_Operation) ------- 84
13.4. Schematic Diagram (Handset)------------------------ 86
13.5. Schematic Diagram (Charger Unit)------------------ 88
14 Printed Circuit Board ------------------------------------------ 89
14.1. Circuit Board (Base Unit_MAIN) --------------------- 89
14.2. Circuit Board (Base Unit_Operation)---------------- 91
14.3. Circuit Board (Handset) -------------------------------- 92
14.4. Circuit Board (Charger Unit)--------------------------- 94
15 Exploded View and Replacement Parts List ----------- 95
15.1. Cabinet and Electrical Parts (Base Unit) ----------- 95
15.2. Cabinet and Electrical Parts (Handset)------------- 96
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 97
15.4. Accessories and Packing Materials ----------------- 98
15.5. Replacement Part List -------------------------------- 100
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KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN
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