Table Of Contents - Panasonic KX-TG7841S Service Manual

KX-TG7841/KX-TG7842/KX-TG7843/KX-TG7844/KX-TG7845/KX-TG365SK/KX-TG7871/KX-TG7872/KX-TG7873/KX-TG7874/KX-TG7875/KX-TG385SK/KX-TGA680

TABLE OF CONTENTS

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. Circuit Configuration
Phones ------------------------------------------------------- 8
4.2. US-DECT Description ------------------------------------ 9
4.2.1. TDD Frame Format ---------------------------------- 9
4.2.2. TDMA system------------------------------------------ 9
4.2.3. Signal Flowchart in the Radio Parts-------------10
4.3. Block Diagram (Base Unit_Main)--------------------- 11
4.4. Tel Interface Circuit---------------------------------------12
4.5. Block Diagram (Base Unit_RF Part) -----------------13
4.6. Circuit Operation (Base Unit) --------------------------14
4.6.1. BBIC (Base Band IC: IC501) ---------------------14
4.6.2. Flash Memory (IC502)------------------------------14
4.6.3. Flash Memory (IC601)------------------------------14
4.6.4. EEPROM (IC611) ------------------------------------14
4.6.5. Bluetooth Unit (IC721)------------------------------14
4.6.6. Power Supply Circuit/Reset Circuit--------------15
4.6.7. Telephone Line Interface---------------------------17
4.6.8. Parallel Connection Detect Circuit/Auto
Disconnect Circuit -----------------------------------18
4.6.9. Calling Line Identification (Caller ID)/Call
Waiting Caller ID -------------------------------------19
4.7. Block Diagram (Handset)-------------------------------21
4.8. Block Diagram (Handset_RF Part)-------------------22
4.9. Circuit Operation (Handset)----------------------------23
4.9.1. Outline --------------------------------------------------23
4.9.2. Power Supply Circuit/Reset Circuit--------------23
4.9.3. Charge Circuit ----------------------------------------24
4.9.4. Battery Low/Power Down Detector--------------24
4.9.5. Speakerphone ----------------------------------------24
4.10. Behavior of Electric Power Failure -------------------25
4.11. Circuit Operation (Charger Unit) ----------------------25
4.12. Signal Route -----------------------------------------------26
5 Location of Controls and Components ------------------28
6 Installation Instructions ---------------------------------------28
7 Operating Instructions-----------------------------------------28
8 Test Mode ----------------------------------------------------------29
8.1. Engineering Mode ----------------------------------------29
8.1.1. Base Unit ----------------------------------------------29
8.1.2. Handset ------------------------------------------------31
9 Service Mode -----------------------------------------------------33
9.1. How to Clear User Setting (Handset Only)---------33
10 Troubleshooting Guide ----------------------------------------34
10.1. Troubleshooting Flowchart -----------------------------34
10.1.1. Check Power------------------------------------------35
10.1.2. Check Record ----------------------------------------36
10.1.3. Check Playback -------------------------------------39
10.1.4. Check Battery Charge ------------------------------39
10.1.5. Check Link---------------------------------------------40
10.1.6. Check the RF part -----------------------------------42
PAGE
of TG78xx Series
10.1.7. Registering a Handset to the Base Unit ------- 46
10.1.8. Deregistering a Handset--------------------------- 46
10.1.9. Check Handset Transmission -------------------- 47
10.1.10. Check Handset Reception ------------------------ 47
10.1.11. Check Caller ID ------------------------------------- 47
10.1.12. Check BT Communication ------------------------ 48
11 Disassembly and Assembly Instructions--------------- 50
11.1. Disassembly Instructions------------------------------- 50
11.1.1. Base Unit ---------------------------------------------- 50
11.1.2. Handset ------------------------------------------------ 52
11.1.3. Charger Unit ------------------------------------------ 53
11.2. How to Replace the Base unit LCD ----------------- 54
11.3. How to Replace the Handset LCD------------------- 56
12 Measurements and Adjustments -------------------------- 57
12.1. Equipment Required ------------------------------------ 57
12.2. The Setting Method of JIG----------------------------- 57
12.2.1. Connections (Base Unit) -------------------------- 57
12.2.2. Connections (Handset) ---------------------------- 58
12.2.3. How to install Batch file into P.C. ---------------- 59
12.2.4. Commands-------------------------------------------- 60
12.3. Adjustment Standard (Base Unit) -------------------- 61
12.3.1. Bottom View ------------------------------------------ 61
12.4. Adjustment Standard (Handset) ---------------------- 62
12.4.1. Component View ------------------------------------ 62
12.5. Things to Do after Replacing IC or X'tal ------------ 63
12.5.1. How to download the data ------------------------ 63
12.6. Frequency Table------------------------------------------ 66
12.7. Bluetooth Frequency Table ---------------------------- 67
13 Miscellaneous---------------------------------------------------- 68
13.1. How to Replace the LLP (Leadless Leadframe
Package) IC ----------------------------------------------- 68
13.1.1. Preparation-------------------------------------------- 68
13.1.2. Caution------------------------------------------------- 68
13.1.3. How to Remove the IC ----------------------------- 68
13.1.4. How to Install the IC -------------------------------- 69
13.2. How to Replace the Flat Package IC --------------- 70
13.2.1. Preparation-------------------------------------------- 70
13.2.2. How to Remove the IC ----------------------------- 70
13.2.3. How to Install the IC -------------------------------- 71
13.2.4. How to Remove a Solder Bridge ---------------- 71
13.3. Terminal Guide of the ICs, Transistors and
Diodes ------------------------------------------------------ 72
13.3.1. Base Unit ---------------------------------------------- 72
13.3.2. Handset ------------------------------------------------ 72
14 Schematic Diagram -------------------------------------------- 73
14.1. For Schematic Diagram -------------------------------- 73
14.1.1. Base Unit (Schematic Diagram (Base
Unit_Main)) ------------------------------------------- 73
14.1.2. Handset
(Handset_Main))------------------------------------- 73
14.2. Schematic Diagram (Base Unit_Main)-------------- 74
14.3. Schematic Diagram (Base Unit_RF) ---------------- 76
14.4. Schematic Diagram (Base Unit_Operation) ------- 77
14.5. Schematic Diagram (Base Unit_USB Charge) --- 78
14.6. Schematic Diagram (Base Unit_LED) -------------- 78
14.7. Schematic Diagram (Handset_Main) --------------- 80
15 Printed Circuit Board ------------------------------------------ 83
15.1. Circuit Board (Base Unit_Main) ---------------------- 83
3
PAGE
(Schematic Diagram