KX-TG8551UAB, KX-TG8561UAB, KX-TG8561UAR, KX-TGA855RUB, KX-TGA855RUR - Panasonic Telephone Service Manual (repair manual). Page 3

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1 Safety Precautions----------------------------------------------- 5

1.1. For Service Technicians --------------------------------- 5

2 Warning -------------------------------------------------------------- 5

2.1. Battery Caution--------------------------------------------- 5
2.2. About Lead Free Solder (Pbf: Pb free)--------------- 5

2.2.1. Suggested PbF Solder ------------------------------ 6

2.3. Discarding of P.C. Board--------------------------------- 6

3 Specifications ----------------------------------------------------- 7
4 Technical Descriptions ----------------------------------------- 8

4.1. Block Diagram (Base Unit) ------------------------------ 8
4.2. Circuit Operation (Base Unit) --------------------------- 9

4.2.1. Outline --------------------------------------------------- 9

4.3. Block Diagram (Base Unit RF Part)------------------10
4.4. Circuit Operation (Base Unit) -------------------------- 11

4.4.1. BBIC (Base Band IC: IC501) --------------------- 11
4.4.2. Flash Memory (IC601) (for KX-TG8561

only) ----------------------------------------------------- 11

4.4.3. EEPROM (IC611) ------------------------------------ 11
4.4.4. Power Supply Circuit--------------------------------12
4.4.5. Telephone Line Interface---------------------------13
4.4.6. Transmitter/Receiver--------------------------------13

4.5. Block Diagram (Handset)-------------------------------14
4.6. Circuit Operation (Handset)----------------------------15

4.6.1. Outline --------------------------------------------------15
4.6.2. Power Supply Circuit/Reset Circuit--------------15
4.6.3. Charge Circuit ----------------------------------------15
4.6.4. Battery Low/Power Down Detector--------------15
4.6.5. Speakerphone ----------------------------------------15

4.7. Circuit Operation (Charger Unit) ----------------------16

4.7.1. Power Supply Circuit--------------------------------16

4.8. Behavior of Electric Power Failure -------------------16
4.9. Signal Route -----------------------------------------------17

5 Location of Controls and Components ------------------19
6 Installation Instructions ---------------------------------------19
7 Operating Instructions-----------------------------------------19

7.1. For Service Hint-------------------------------------------19

8 Service Mode -----------------------------------------------------20

8.1. Engineering Mode ----------------------------------------20

8.1.1. Base Unit ----------------------------------------------20
8.1.2. Handset ------------------------------------------------22

8.2. EEPROM LAYOUT (Handset)-------------------------24

8.2.1. Scope ---------------------------------------------------24
8.2.2. Introduction--------------------------------------------24
8.2.3. EEPROM contents ----------------------------------24

8.3. Copying Phonebook Items when Repairing -------25
8.4. How to Clear User Setting------------------------------27

8.4.1. Resetting both base unit and handset----------27
8.4.2. Resetting only handset -----------------------------27

9 Troubleshooting Guide ----------------------------------------28

9.1. Troubleshooting Flowchart -----------------------------28

9.1.1. Check Power------------------------------------------29
9.1.2. Check Battery Charge ------------------------------30
9.1.3. Check Link---------------------------------------------32
9.1.4. Check the RF part -----------------------------------35
9.1.5. Check Handset Transmission --------------------38
9.1.6. Check Handset Reception-------------------------38
9.1.7. Check Caller ID --------------------------------------38
9.1.8. Check Headset Transmission --------------------38

9.1.9. Check Headset Reception ------------------------ 38

9.1.10. Bell Reception---------------------------------------- 39

9.1.11. Check TAM Operation (for KX-TG8561

only) ---------------------------------------------------- 39

9.1.12. Operation with supply from handset under

electric power failure ------------------------------- 40

9.2. Troubleshooting by Symptom (Base Unit and

Charger Unit)---------------------------------------------- 41

9.2.1. Check Point (Base Unit) --------------------------- 41
9.2.2. Check Point (Charger Unit) ----------------------- 43

9.3. Troubleshooting by Symptom (Handset)----------- 44

9.3.1. Check Point (Handset)----------------------------- 44
9.3.2. Troubleshooting for Speakerphone ------------- 47

10 Disassembly and Assembly Instructions--------------- 48

10.1. Disassembly Instructions------------------------------- 48

10.1.1. Base Unit ---------------------------------------------- 48
10.1.2. Handset------------------------------------------------ 51
10.1.3. Charger Unit ------------------------------------------ 52

10.2. How to Replace the Base Unit LCD (KX-

TG8561 Only) --------------------------------------------- 53

10.3. How to Replace the Handset LCD------------------- 55

11 Measurements and Adjustments -------------------------- 56

11.1. Equipment Required ------------------------------------ 56
11.2. The Setting Method of JIG (Base Unit) ------------- 56

11.2.1. Connections ------------------------------------------ 56
11.2.2. How to install Batch file into P.C. ---------------- 57
11.2.3. Commands-------------------------------------------- 57

11.3. Adjustment Standard (Base Unit) -------------------- 58

11.3.1. Bottom View ------------------------------------------ 58

11.4. Adjustment Standard (Charger Unit) ---------------- 60

11.4.1. Bottom View ------------------------------------------ 60

11.5. The Setting Method of JIG (Handset)--------------- 61

11.5.1. Connections ------------------------------------------ 61
11.5.2. How to install Batch file into P.C. ---------------- 62
11.5.3. Commands-------------------------------------------- 62

11.6. Adjustment Standard (Handset) ---------------------- 63

11.6.1. Component View ------------------------------------ 63

11.7. Things to Do after Replacing IC or X'tal ------------ 64

11.7.1. How to download the data ------------------------ 64

11.8. RF Specification ------------------------------------------ 66

11.8.1. Base Unit ---------------------------------------------- 66
11.8.2. Handset------------------------------------------------ 66

11.9. How to Check the Handset Speaker or

Receiver ---------------------------------------------------- 67

11.10. Frequency Table (MHz)--------------------------------- 67

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

12.1. How to Replace the Flat Package IC --------------- 68

12.1.1. Preparation-------------------------------------------- 68
12.1.2. How to Remove the IC----------------------------- 68
12.1.3. How to Install the IC -------------------------------- 69
12.1.4. How to Remove a Solder Bridge ---------------- 69

12.2. How to Replace the Shield Case--------------------- 70

12.2.1. Preparation-------------------------------------------- 70
12.2.2. Caution------------------------------------------------- 70
12.2.3. How to Remove the Shield Case---------------- 70
12.2.4. How to Install the Shield Case ------------------- 71

12.3. Terminal Guide of the ICs, Transistors, Diodes

and Electrolytic Capacitors ---------------------------- 72