KX-TG8051RUB, KX-TG8051UAB, KX-TG8051CAB, KX-TGA806RUB - 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
6 Installation Instructions ---------------------------------------16
7 Operating Instructions-----------------------------------------16

7.1. For Service Hint-------------------------------------------16

8 Service Mode -----------------------------------------------------17

8.1. Engineering Mode ----------------------------------------17
8.2. Copying Phonebook Items when Repairing -------21
8.3. How to Clear User Setting------------------------------23

9 Troubleshooting Guide ----------------------------------------24

9.1. Troubleshooting Flowchart -----------------------------24
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------36

9.3. Troubleshooting by Symptom (Handset) -----------39

10 Disassembly and Assembly Instructions ---------------43

10.1. Disassembly Instructions -------------------------------43
10.2. How to Replace the Handset LCD -------------------46

11 Measurements and Adjustments---------------------------47

11.1. Equipment Required -------------------------------------47
11.2. The Setting Method of JIG (Base Unit) -------------47
11.3. Adjustment Standard (Base Unit)---------------------49
11.4. Adjustment Standard (Charger Unit)-----------------50
11.5. The Setting Method of JIG (Handset) ---------------51
11.6. Adjustment Standard (Handset) ----------------------53
11.7. Things to Do after Replacing IC or X'tal ------------54
11.8. RF Specification-------------------------------------------56
11.9. How to Check the Handset Speaker or

Receiver ----------------------------------------------------57

11.10. Frequency Table (MHz) ---------------------------------57

12 Miscellaneous ----------------------------------------------------58

12.1. How to Replace the Flat Package IC ----------------58
12.2. How to Replace the Shield Case ---------------------60
12.3. Terminal Guide of the ICs, Transistors and

Diodes -------------------------------------------------------62

13 Schematic Diagram ---------------------------------------------63

13.1. For Schematic Diagram---------------------------------63
13.2. Schematic Diagram (Base Unit) ----------------------64
13.3. Schematic Diagram (Handset) ------------------------66
13.4. Schematic Diagram (Charger Unit) ------------------68

14 Printed Circuit Board-------------------------------------------69

14.1. Circuit Board (Base Unit_Main) -----------------------69
14.2. Circuit Board (Handset) ---------------------------------71
14.3. Circuit Board (Charger Unit) ---------------------------73

15 Exploded View and Replacement Parts List -----------74

15.1. Cabinet and Electrical Parts (Base Unit) -----------74

15.2. Cabinet and Electrical Parts (Handset)------------- 75
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 76
15.4. Accessories------------------------------------------------ 77
15.5. Replacement Part List ---------------------------------- 78