KX-TG8077UAJ, KX-TG8077UAS, KX-TG8077UAT, KX-TG8078UAS, KX-TG8078UAT, KX-TGA807UAJ, KX-TGA807UAS, KX-TGA807UAT, KX-TGA809RUS, KX-TGA809RUT - 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)-------------------------------- 9
4.4. Circuit Operation (Handset)----------------------------10
4.5. Signal Flow-------------------------------------------------11

5 Location of Controls and Components ------------------12

5.1. Controls -----------------------------------------------------12

6 Installation Instructions ---------------------------------------12

6.1. Connections------------------------------------------------12
6.2. Battery-------------------------------------------------------13

7 Operating Instructions-----------------------------------------14

7.1. Base Unit Settings----------------------------------------14
7.2. Handset Settings -----------------------------------------15
7.3. Registering a Handset to a Base Unit---------------16
7.4. Deregistering a Handset --------------------------------16
7.5. Key Lock ----------------------------------------------------16
7.6. For Service Hint-------------------------------------------17

8 Service Mode -----------------------------------------------------18

8.1. Engineering Mode ----------------------------------------18
8.2. How to Clear User Setting------------------------------23
8.3. How to Set when Replacing Unit ---------------------25

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

9.1. Error Message---------------------------------------------26
9.2. Troubleshooting-------------------------------------------27
9.3. Check Point ------------------------------------------------29
9.4. How to Replace the Flat Package IC----------------30

10 Disassembly and Assembly Instructions ---------------32

10.1. Disassembly Instructions -------------------------------32

11 Measurements and Adjustments---------------------------34

11.1. Preparation-------------------------------------------------34
11.2. Connections------------------------------------------------35
11.3. TEST Mode Settings ------------------------------------37
11.4. Read ID -----------------------------------------------------38
11.5. Adjustment Standard ------------------------------------39
11.6. Adjust Frequency  ----------------------------------------41
11.7. Adjust Voltage ---------------------------------------------42

12 Schematic Diagram ---------------------------------------------44

12.1. For Schematic Diagram---------------------------------44
12.2. Schematic Diagram (Base Unit_Main) --------------45
12.3. Schematic Diagram (Handset) ------------------------48

13 Printed Circuit Board-------------------------------------------51

13.1. Circuit Board (Base Unit) -------------------------------51
13.2. Circuit Board (Handset) ---------------------------------53

14 Appendix Information of Schematic Diagram ---------55

14.1. Terminal Guide of the ICs, Transistors and

Diodes -------------------------------------------------------55

15 Exploded View and Replacement Parts List -----------56

15.1. Cabinet and Electrical Parts (Base Unit) -----------56
15.2. Cabinet and Electrical Parts (Handset) -------------57
15.3. Accessories and Packing Materials------------------58

15.4. Replacement Part List ---------------------------------- 61