KX-TG8227UAB, KX-TG8227UAR, KX-TG8227UAW, KX-TGA820RUB, KX-TGA820RUR, KX-TGA820RUW, KX-TGA820UAB, KX-TGA820UAR, KX-TGA820UAW - 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--------------------------------------- 16

6.1. Connections ----------------------------------------------- 16
6.2. Battery ------------------------------------------------------ 17

7 Operation Instructions ---------------------------------------- 18

7.1. Base Unit Settings --------------------------------------- 18
7.2. Handset Settings ----------------------------------------- 19
7.3. Registering a Handset to a Base Unit -------------- 20
7.4. Copying Phonebook Entries--------------------------- 21
7.5. Dialling Mode (Tone/Pulse) ---------------------------- 21
7.6. Error Message -------------------------------------------- 21
7.7. Troubleshooting ------------------------------------------ 22
7.8. 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) ----------- 47
9.4. How to Replace the Flat Package IC --------------- 50
9.5. How to Replace the LLP (Leadless Leadframe

Package) IC ----------------------------------------------- 52

10 Disassembly and Assembly Instructions--------------- 54

10.1. Disassembly Instructions------------------------------- 54
10.2. Assembly Instructions----------------------------------- 58

11 Measurements and Adjustments -------------------------- 59

11.1. The Setting Method of JIG (Base Unit) ------------- 59
11.2. Adjustment Standard (Base Unit) -------------------- 61
11.3. Adjustment Standard (Charger Unit) ---------------- 62
11.4. The Setting Method of JIG (Handset)--------------- 63
11.5. Adjustment Standard (Handset) ---------------------- 65
11.6. Things to Do after Replacing IC or X'tal ------------ 66
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 -------------------------------------------- 71

12.1. For Schematic Diagram -------------------------------- 71
12.2. Schematic Diagram (Base Unit)---------------------- 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 Part List-----------------------------------96