KX-TG7331CAM, KX-TG7331CAT, KX-TGA731RUM, KX-TGA731RUT, KX-TGA731RUC, KX-TGA731RUS - 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-------------------------------------------------------17

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

7.1. Programmable Settings ---------------------------------18
7.2. Registering a Handset to the Base Unit ------------19
7.3. Copying Phonebook Entries ---------------------------20
7.4. Dialling Mode ----------------------------------------------20
7.5. Error Messages -------------------------------------------20
7.6. Troubleshooting-------------------------------------------21
7.7. For Service Hint-------------------------------------------24

8 Service Mode -----------------------------------------------------25

8.1. Engineering Mode ----------------------------------------25
8.2. Copying Phonebook Items when Repairing -------29
8.3. How to Clear User Setting------------------------------31

9 Troubleshooting Guide ----------------------------------------32

9.1. Troubleshooting Flowchart -----------------------------32
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------44

9.3. Troubleshooting by Symptom (Handset) -----------48

10 Disassembly and Assembly Instructions ---------------52

10.1. Disassembly Instructions -------------------------------52
10.2. How to Replace the Handset LCD -------------------56

11 Measurements and Adjustments---------------------------57

11.1. The Setting Method of JIG (Base Unit) -------------57
11.2. Adjustment Standard (Base Unit)---------------------59
11.3. Adjustment Standard (Charger Unit)-----------------60
11.4. The Setting Method of JIG (Handset) ---------------61
11.5. Adjustment Standard (Handset) ----------------------63
11.6. Things to Do after Replacing IC or X'tal ------------64
11.7. RF Specification-------------------------------------------66
11.8. How to Check the Speaker or Receiver ------------67
11.9. Frequency Table (MHz) ---------------------------------67

12 Miscellaneous ----------------------------------------------------68

12.1. CPU Data (Base Unit) -----------------------------------68
12.2. CPU Data (Handset)-------------------------------------70
12.3. How to Replace the Flat Package IC----------------72
12.4. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------74

12.5. Terminal Guide of the ICs, Transistors and

Diodes -------------------------------------------------------76

13 Schematic Diagram ---------------------------------------------77

13.1. For Schematic Diagram -------------------------------- 77
13.2. Schematic Diagram (Base Unit_Main)-------------- 78
13.3. Schematic Diagram (Base Unit_RF Part)---------- 80
13.4. Schematic Diagram (Base Unit_Operation) ------- 81
13.5. Schematic Diagram (Handset)------------------------ 82
13.6. 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