Table Of Contents - Panasonic KX-TG8421EB 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 Setting up ----------------------------------------------------------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. Error Messages -------------------------------------------23
7.5. Troubleshooting -------------------------------------------24
7.6. 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. The Setting Method of JIG (Base Unit) -------------61
11.2. Adjustment Standard (Base Unit)---------------------63
11.3. Adjustment Standard (Charger Unit)-----------------64
11.4. The Setting Method of JIG (Handset) ---------------65
11.5. Adjustment Standard (Handset) ----------------------67
11.6. Things to Do after Replacing IC or X'tal ------------68
11.7. RF Specification-------------------------------------------70
11.8. How to Check the Handset Speaker or
Receiver ----------------------------------------------------71
11.9. 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
12.5. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------80
13 Schematic Diagram ---------------------------------------------82
KX-TG8421E/KX-TG8422E/KX-TG8423E/KX-TG8424E/KX-TGA840E
PAGE
13.1. For Schematic Diagram -------------------------------- 82
13.2. Schematic Diagram (Base Unit)---------------------- 84
13.3. Schematic Diagram (Base Unit_Operation) ------- 86
13.4. Schematic Diagram (Handset)------------------------ 88
13.5. Schematic Diagram (Charger Unit)------------------ 90
14 Printed Circuit Board ------------------------------------------ 91
14.1. Circuit Board (Base Unit_MAIN) --------------------- 91
14.2. Circuit Board (Base Unit_Operation)---------------- 93
14.3. Circuit Board (Handset) -------------------------------- 94
14.4. Circuit Board (Charger Unit)--------------------------- 96
15 Exploded View and Replacement Parts List ----------- 97
15.1. Cabinet and Electrical Parts (Base Unit) ----------- 97
15.2. Cabinet and Electrical Parts (Handset)------------- 98
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 99
15.4. Accessories and Packing Materials --------------- 100
15.5. Replacement Part List -------------------------------- 105
3
PAGE