KX-TG8021UAC, KX-TG8021UAS, KX-TG8021UAT, KX-TGA800RUC, KX-TGA800RUS, KX-TGA800RUT - Panasonic Telephone Service Manual (repair manual). Page 3

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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 ---------------21
7.3. Copying Phonebook Entries ---------------------------22
7.4. Dialling Mode (Tone/Pulse) ----------------------------22
7.5. Error Messages -------------------------------------------23
7.6. Troubleshooting -------------------------------------------24
7.7. For Service Hint-------------------------------------------27

8 Service Mode -----------------------------------------------------28

8.1. Engineering Mode ----------------------------------------28
8.2. Copying Phonebook Items when Repairing -------32
8.3. How to Clear User Setting------------------------------34

9 Troubleshooting Guide ----------------------------------------35

9.1. Troubleshooting Flowchart -----------------------------35
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------47

9.3. Troubleshooting by Symptom (Handset) -----------51

10 Disassembly and Assembly Instructions ---------------55

10.1. Disassembly Instructions -------------------------------55
10.2. How to Replace the Handset LCD -------------------59

11 Measurements and Adjustments---------------------------60

11.1. The Setting Method of JIG (Base Unit) -------------60
11.2. Adjustment Standard (Base Unit)---------------------62
11.3. Adjustment Standard (Charger Unit)-----------------63
11.4. The Setting Method of JIG (Handset) ---------------64
11.5. Adjustment Standard (Handset) ----------------------66
11.6. Things to Do after Replacing IC or X'tal ------------67
11.7. RF Specification-------------------------------------------69
11.8. How to Check the Handset Speaker or

Receiver ----------------------------------------------------70

11.9. Frequency Table (MHz) ---------------------------------70

12 Miscellaneous ----------------------------------------------------71

12.1. CPU Data (Base Unit) -----------------------------------71
12.2. CPU Data (Handset)-------------------------------------73
12.3. How to Replace the Flat Package IC ----------------75
12.4. Terminal Guide of the ICs, Transistors and

Diodes -------------------------------------------------------77

13 Schematic Diagram ---------------------------------------------78

13.1. For Schematic Diagram---------------------------------78

13.2. Schematic Diagram (Base Unit)---------------------- 80
13.3. Schematic Diagram (Base Unit_Operation) ------- 82
13.4. Schematic Diagram (Handset)------------------------ 84
13.5. Schematic Diagram (Charger Unit)------------------ 86

14 Printed Circuit Board ------------------------------------------ 87

14.1. Circuit Board (Base Unit_MAIN) --------------------- 87
14.2. Circuit Board (Base Unit_Operation)---------------- 89
14.3. Circuit Board (Handset) -------------------------------- 91
14.4. Circuit Board (Charger Unit)--------------------------- 93

15 Exploded View and Replacement Parts List ----------- 94

15.1. Cabinet and Electrical Parts (Base Unit) ----------- 94
15.2. Cabinet and Electrical Parts (Handset)------------- 95
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 96
15.4. Accessories and Packing Materials ----------------- 97
15.5. Replacement Part List ---------------------------------- 99