KX-TG8288UAT, KX-TG8287UAT, KX-TGA828UAT, KX-TGA828RUT - 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 ------------------17

5.1. Controls -----------------------------------------------------17

6 Installation Instructions ---------------------------------------18

6.1. Connections------------------------------------------------18
6.2. Battery-------------------------------------------------------19

7 Operation Instructions-----------------------------------------21

7.1. Base Unit Settings----------------------------------------21
7.2. Handset Settings -----------------------------------------23
7.3. Registering a Handset to a Base Unit---------------25
7.4. Copying Phonebook Entries ---------------------------25
7.5. Dialling Mode (Tone/Pulse) ----------------------------25
7.6. Error Messages -------------------------------------------26
7.7. Troubleshooting-------------------------------------------26
7.8. For Service Hint-------------------------------------------30

8 Service Mode -----------------------------------------------------31

8.1. Engineering Mode ----------------------------------------31
8.2. Copying Phonebook Items when Repairing -------35
8.3. How to Clear User Setting------------------------------37

9 Troubleshooting Guide ----------------------------------------38

9.1. Troubleshooting Flowchart -----------------------------38
9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit) ----------------------------------------------51

9.3. Troubleshooting by Symptom (Handset) -----------55
9.4. How to Replace the Flat Package IC----------------58
9.5. How to Replace the LLP (Leadless Leadframe

Package) IC------------------------------------------------60

10 Disassembly and Assembly Instructions ---------------62

10.1. Disassembly Instructions -------------------------------62
10.2. Assembly Instructions -----------------------------------66

11 Measurements and Adjustments---------------------------67

11.1. The Setting Method of JIG (Base Unit) -------------67
11.2. Adjustment Standard (Base Unit)---------------------69
11.3. Adjustment Standard (Charger Unit)-----------------70
11.4. The Setting Method of JIG (Handset) ---------------71
11.5. Adjustment Standard (Handset) ----------------------73
11.6. Things to Do after Replacing IC or X’tal ------------74
11.7. RF Specification-------------------------------------------76
11.8. How to Check the Handset Speaker or

Receiver ----------------------------------------------------77

11.9. Frequency Table (MHz) ---------------------------------77

12 Schematic Diagram ---------------------------------------------79

12.1. For Schematic Diagram---------------------------------79
12.2. Schematic Diagram (Base Unit_Main) --------------80
12.3. Schematic Diagram (Base Unit_Operation) -------84

12.4. Schematic Diagram (Handset)------------------------ 86
12.5. Schematic Diagram (Charger Unit)------------------ 88

13 Printed Circuit Board ------------------------------------------ 89

13.1. Circuit Board (Base Unit_Main) ---------------------- 89
13.2. Circuit Board (Base Unit_Operation)---------------- 91
13.3. Circuit Board (Handset) -------------------------------- 93
13.4. Circuit Board (Charger Unit)--------------------------- 95

14 Appendix Information of Schematic Diagram --------- 96

14.1. CPU Data (Base Unit) ---------------------------------- 96
14.2. CPU Data (Handset) ------------------------------------ 99
14.3. Terminal Guide of the ICs, Transistors and

Diodes ---------------------------------------------------- 101

15 Exploded View and Replacement Parts List --------- 102

15.1. Cabinet and Electrical Parts (Base Unit) --------- 102
15.2. Cabinet and Electrical Parts (Handset)----------- 103
15.3. Cabinet and Electrical Parts (Charger Unit) ----- 104
15.4. Accessories and Packing Materials --------------- 105
15.5. Replacement Parts List------------------------------- 107