KX-TG8411RUB, KX-TG8411RUN, KX-TG8411RUT, KX-TG8411RUW, KX-TG8412RUT, KX-TGA840RUB, KX-TGA840RUN, KX-TGA840RUT, KX-TGA840RUW - 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 ------------------15

5.1. Controls -----------------------------------------------------15

6 Installation Instructions ---------------------------------------16

6.1. Connections------------------------------------------------16
6.2. Battery-------------------------------------------------------16

7 Operating Instructions-----------------------------------------18

7.1. Programmable Settings ---------------------------------18
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-------------------------------------------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 -------------------59

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

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

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

11.10. 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. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------77

12.5. Terminal Guide of the ICs, Transistors and

Diodes ------------------------------------------------------ 79

13 Schematic Diagram -------------------------------------------- 81

13.1. For Schematic Diagram -------------------------------- 81
13.2. Schematic Diagram (Base Unit)---------------------- 82
13.3. Schematic Diagram (Handset)------------------------ 84
13.4. Schematic Diagram (Charger Unit)------------------ 86

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

14.1. Circuit Board (Base Unit_MAIN) --------------------- 87
14.2. Circuit Board (Handset) -------------------------------- 89
14.3. 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 ---------------------------------- 98