KX-TG8521RUB, KX-TG8522RUB, KX-TGA850RUB - 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. Block Diagram (Handset_RF Part)-------------------12
4.5. Circuit Operation (Handset)----------------------------13
4.6. Circuit Operation (Charger Unit) ----------------------15
4.7. Signal Route -----------------------------------------------16

5 Location of Controls and Components ------------------18
6 Installation Instructions ---------------------------------------18
7 Operating Instructions-----------------------------------------18

7.1. For Service Hint-------------------------------------------18

8 Service Mode -----------------------------------------------------19

8.1. Engineering Mode ----------------------------------------19
8.2. Copying Phonebook Items when Repairing -------23
8.3. How to Clear User Setting------------------------------25

9 Troubleshooting Guide ----------------------------------------26

9.1. Troubleshooting Flowchart -----------------------------26
9.2. Troubleshooting by Symptom (Base Unit and

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

9.3. Troubleshooting by Symptom (Handset) -----------40

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

10.1. Disassembly Instructions -------------------------------43
10.2. How to Replace the Handset LCD -------------------47

11 Measurements and Adjustments---------------------------48

11.1. Equipment Required -------------------------------------48
11.2. The Setting Method of JIG (Base Unit) -------------48
11.3. Adjustment Standard (Base Unit)---------------------50
11.4. Adjustment Standard (Charger Unit)-----------------51
11.5. The Setting Method of JIG (Handset) ---------------52
11.6. Adjustment Standard (Handset) ----------------------54
11.7. Things to Do after Replacing IC or X'tal ------------55
11.8. RF Specification-------------------------------------------57
11.9. How to Check the Handset Speaker or

Receiver ----------------------------------------------------58

11.10. Frequency Table (MHz) ---------------------------------58

12 Miscellaneous ----------------------------------------------------59

12.1. How to Replace the Flat Package IC ----------------59
12.2. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------61

12.3. How to Replace the Shield Case ---------------------63
12.4. Terminal Guide of the ICs, Transistors, Diodes

and Electrolytic Capacitors-----------------------------65

13 Schematic Diagram ---------------------------------------------66

13.1. For Schematic Diagram---------------------------------66
13.2. Schematic Diagram (Base Unit) ----------------------68
13.3. Schematic Diagram (Base Unit_Operation) -------70
13.4. Schematic Diagram (Handset) ------------------------72
13.5. Schematic Diagram (Charger Unit) ------------------74

14 Printed Circuit Board-------------------------------------------75

14.1. Circuit Board (Base Unit_Main) -----------------------75

14.2. Circuit Board (Base Unit_Operation)---------------- 77
14.3. Circuit Board (Handset) -------------------------------- 79
14.4. Circuit Board (Charger Unit)--------------------------- 81

15 Exploded View and Replacement Parts List ----------- 82

15.1. Cabinet and Electrical Parts (Base Unit) ----------- 82
15.2. Cabinet and Electrical Parts (Handset)------------- 83
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 84
15.4. Accessories------------------------------------------------ 85
15.5. Replacement Part List ---------------------------------- 86