Panasonic KX-TG8021BXS, Service Manual

Page: 3 / 101

3
KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT
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. 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---------------20
7.3. Copying Phonebook Entries ---------------------------21
7.4. Dialling Mode ----------------------------------------------21
7.5. Error Messages -------------------------------------------22
7.6. Troubleshooting-------------------------------------------23
7.7. For Service Hint-------------------------------------------25
8 Service Mode ----------------------------------------------------- 26
8.1. Engineering Mode ----------------------------------------26
8.2. Copying Phonebook Items when Repairing -------30
8.3. How to Clear User Setting------------------------------32
9 Troubleshooting Guide ---------------------------------------- 33
9.1. Troubleshooting Flowchart -----------------------------33
9.2. Troubleshooting by Symptom (Base Unit and
Charger Unit) ----------------------------------------------45
9.3. Troubleshooting by Symptom (Handset) -----------49
10 Disassembly and Assembly Instructions --------------- 53
10.1. Disassembly Instructions -------------------------------53
10.2. How to Replace the Handset LCD -------------------57
11 Measurements and Adjustments --------------------------- 58
11.1. The Setting Method of JIG (Base Unit) -------------58
11.2. Adjustment Standard (Base Unit)---------------------60
11.3. Adjustment Standard (Charger Unit)-----------------61
11.4. The Setting Method of JIG (Handset) ---------------62
11.5. Adjustment Standard (Handset) ----------------------64
11.6. Things to Do after Replacing IC or X'tal ------------65
11.7. RF Specification-------------------------------------------67
11.8. How to Check the Handset Speaker or
Receiver ----------------------------------------------------68
11.9. Frequency Table (MHz) ---------------------------------68
12 Miscellaneous ---------------------------------------------------- 69
12.1. CPU Data (Base Unit) -----------------------------------69
12.2. CPU Data (Handset)-------------------------------------71
12.3. How to Replace the Flat Package IC----------------73
12.4. Terminal Guide of the ICs, Transistors and
Diodes -------------------------------------------------------75
13 Schematic Diagram --------------------------------------------- 76
13.1. For Schematic Diagram---------------------------------76
13.2. Schematic Diagram (Base Unit_Main)-------------- 78
13.3. Schematic Diagram (Base Unit_Operation) ------- 80
13.4. Schematic Diagram (Handset)------------------------ 82
13.5. Schematic Diagram (Charger Unit)------------------ 84
14 Printed Circuit Board ------------------------------------------ 85
14.1. Circuit Board (Base Unit_Main) ---------------------- 85
14.2. Circuit Board (Base Unit_Operation)---------------- 87
14.3. Circuit Board (Handset) -------------------------------- 89
14.4. Circuit Board (Charger Unit)--------------------------- 91
15 Exploded View and Replacement Parts List ----------- 92
15.1. Cabinet and Electrical Parts (Base Unit) ----------- 92
15.2. Cabinet and Electrical Parts (Handset)------------- 93
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 94
15.4. Accessories and Packing Materials ----------------- 95
15.5. Replacement Part List ---------------------------------- 97