KX-TG8127UAS, KX-TG8127UAT, KX-TGA810UAS, KX-TGA810UAT - 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

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 Operation Instructions-----------------------------------------19

7.1. Base Unit Settings----------------------------------------19
7.2. Handset Settings -----------------------------------------20
7.3. Registering a Handset to a Base Unit---------------22
7.4. For Service Hint-------------------------------------------23

8 Service Mode -----------------------------------------------------24

8.1. Engineering Mode ----------------------------------------24
8.2. EEPROM Layout (Base Unit)--------------------------29
8.3. EEPROM Layout (Handset) ---------------------------34

9 Troubleshooting Guide ----------------------------------------37

9.1. Troubleshooting Flowchart -----------------------------37
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------45

9.3. Troubleshooting by Symptom (Handset) -----------49
9.4. How to Replace the Flat Package IC----------------52
9.5. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------54

10 Disassembly and Assembly Instructions ---------------56

10.1. Disassembly Instructions -------------------------------56
10.2. Assembly Instructions -----------------------------------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 ----------------------67
11.7. RF Specification-------------------------------------------68
11.8. How to Check the Handset Speaker or

Receiver ----------------------------------------------------69

11.9. Frequency Table (MHz) ---------------------------------69

12 Schematic Diagram ---------------------------------------------70

12.1. For Schematic Diagram---------------------------------70
12.2. Schematic Diagram (Base Unit_Main) --------------72
12.3. Schematic Diagram (Base Unit_Operation) -------74
12.4. Schematic Diagram (Handset) ------------------------76
12.5. Schematic Diagram (Charger Unit) ------------------78

13 Printed Circuit Board-------------------------------------------79

13.1. Circuit Board (Base Unit_Main) -----------------------79
13.2. Circuit Board (Base Unit_Operation) ----------------81

13.3. Circuit Board (Handset) -------------------------------- 83
13.4. Circuit Board (Charger Unit)--------------------------- 85

14 Appendix Information of Schematic Diagram --------- 86

14.1. CPU Data (Base Unit) ---------------------------------- 86
14.2. CPU Data (Handset) ------------------------------------ 88
14.3. Terminal Guide of the ICs, Transistors and

Diodes ------------------------------------------------------ 90

15 Exploded View and Replacement Parts List ----------- 91

15.1. Cabinet and Electrical Parts (Base Unit) ----------- 91
15.2. Cabinet and Electrical Parts (Handset)------------- 92
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 93
15.4. Accessories and Packing Materials ----------------- 94
15.5. Replacement Parts List--------------------------------- 96