KX-TCA275RU - Panasonic PBX Service Manual (repair manual). Page 2

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1 Safety Precautions -----------------------------------------------3

1.1. For Service Technicians  ---------------------------------3

2 Warning --------------------------------------------------------------3

2.1. About Lead Free Solder (PbF: Pb free) --------------3

2.1.1. Suggested PbF Solder -------------------------------3

2.2. Battery Caution ---------------------------------------------4
2.3. Discarding of P. C. Board --------------------------------4

3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------6

4.1. Block Diagram (Handset) --------------------------------6
4.2. Circuit Operation (Handset) -----------------------------7

4.2.1. Outline----------------------------------------------------7
4.2.2. Power Supply Circuit/Reset Circuit ---------------7
4.2.3. Charge Circuit (Include Charger)------------------8
4.2.4. Battery Low/Power Down Detector ---------------8
4.2.5. TX Audio Path------------------------------------------9
4.2.6. RX Audio Path --------------------------------------- 11
4.2.7. Ringer Circuit ----------------------------------------- 12
4.2.8. Key Click Sound Circuit---------------------------- 12
4.2.9. Vibrator Circuit --------------------------------------- 13

5 Location of Controls and Components------------------ 14

5.1. Handset----------------------------------------------------- 14

6 Installation Instructions--------------------------------------- 16

6.1. Charger Connection ------------------------------------- 16
6.2. Battery ------------------------------------------------------ 16

6.2.1. Battery Installation ---------------------------------- 16
6.2.2. Charging the Battery-------------------------------- 16
6.2.3. Battery Information---------------------------------- 17
6.2.4. Low Battery Warning ------------------------------- 17
6.2.5. Replacing the Batteries ---------------------------- 17

7 Operating Instructions ---------------------------------------- 18

7.1. Soft Keys --------------------------------------------------- 18
7.2. Handset Setting Menu Layout ------------------------ 20
7.3. Key Lock---------------------------------------------------- 21
7.4. Selecting the Display Language---------------------- 21
7.5. DISPLAY --------------------------------------------------- 22
7.6. Function Menus------------------------------------------- 23

7.6.1. Main Menu-While in Standby Mode------------- 23
7.6.2. Sub Menu-While Off-hook/During a

Conversation ----------------------------------------- 23

7.7. Function Keys --------------------------------------------- 24
7.8. Flexible Keys ---------------------------------------------- 25
7.9. Caller ID ---------------------------------------------------- 26

7.10. Character Mode Table ---------------------------------- 27

8 Troubleshooting Guide---------------------------------------- 28

8.1. Power Trouble (Handset) ------------------------------ 29

8.1.1. Power Does Not Go On---------------------------- 29

8.2. Battery Charge Trouble (Handset)------------------- 31

8.2.1. Charge On -------------------------------------------- 31
8.2.2. Charge Off--------------------------------------------- 32

8.3. LED Trouble (Handset) --------------------------------- 33

8.3.1. Key Back-Light --------------------------------------- 33
8.3.2. Charging And Ringing LED ----------------------- 33

8.4. Vibrator Trouble (Handset) ---------------------------- 34
8.5. Ringer Trouble (Handset) ------------------------------ 34
8.6. No Voice Transmission --------------------------------- 35
8.7. No Voice Reception-------------------------------------- 36

8.7.1. Talk Mode --------------------------------------------- 36

8.7.2. Speakerphone Mode ------------------------------- 37

8.8. Password Trouble --------------------------------------- 37

8.8.1. User Password is forgotten.---------------------- 37
8.8.2. System Lock Password is forgotten. ----------- 37

9 Service Fixture & Tools--------------------------------------- 38

10 Disassembly and Assembly Instructions -------------- 39

10.1. Handset ---------------------------------------------------- 39
10.2. Charger Unit ---------------------------------------------- 39

11 Measurements and Adjustments -------------------------- 40

11.1. Check Procedure (Handset) -------------------------- 40

11.1.1. Preparation ------------------------------------------- 40
11.1.2. PC Setting -------------------------------------------- 40
11.1.3. Download Manual----------------------------------- 41

11.2. Adjustments (Handset and Charger Unit) --------- 46

11.2.1. Adjustment (Handset)------------------------------ 46
11.2.2. Adjustment Standard (Handset)----------------- 48
11.2.3. Adjustment (Charger Unit)------------------------ 50
11.2.4. Adjustment Standard (Charger Unit) ----------- 50

11.3. RF Specification (Handset)---------------------------- 50
11.4. How to Check the Handset Speaker---------------- 51
11.5. How to Check the Handset Receiver --------------- 51
11.6. Frequency Table (MHz) -------------------------------- 52

12 Miscellaneous --------------------------------------------------- 53

12.1. How To Replace a Flat Package IC----------------- 53

12.1.1. Preparation ------------------------------------------- 53
12.1.2. Removal Procedure -------------------------------- 53
12.1.3. Procedure--------------------------------------------- 53
12.1.4. Removing Solder From Between Pins--------- 53

12.2. Terminal Guide of the ICs Transistors and

Diodes ------------------------------------------------------ 54

12.2.1. Handset ----------------------------------------------- 54
12.2.2. Charger Unit------------------------------------------ 54

13 Schematic Diagram -------------------------------------------- 56

13.1. Handset ---------------------------------------------------- 56
13.2. Handset (RF Unit) --------------------------------------- 58
13.3. Charger Unit ---------------------------------------------- 59

14 Printed Circuit Board------------------------------------------ 61

14.1. Handset ---------------------------------------------------- 61

14.1.1. Component View------------------------------------ 61
14.1.2. Flow Solder Side View----------------------------- 62

14.2. Charger Unit ---------------------------------------------- 63

14.2.1. Component View------------------------------------ 63
14.2.2. Flow Solder Side View----------------------------- 63

15 Appendix Information of Schematic Diagram -------- 63
16 Exploded View and Replacement Parts List----------- 64

16.1. CPU Data (Handset) ------------------------------------ 64

16.1.1. IC3 (BBIC) -------------------------------------------- 64

16.2. Cabinet and electrical Parts Location--------------- 66

16.2.1. Handset ----------------------------------------------- 66
16.2.2. Charger Unit------------------------------------------ 67
16.2.3. Accessories and Packing Materials ------------ 68

16.3. Replacement Parts List -------------------------------- 69

16.3.1. Cabinet and Electrical Parts (Handset)-------- 69
16.3.2. Cabinet and Electrical Parts (Charger unit) -- 69
16.3.3. Accessories and Packing Materials ------------ 69
16.3.4. Handset Board Parts------------------------------- 69
16.3.5. Charger unit Board Parts ------------------------- 72
16.3.6. Fixtures and Tools ---------------------------------- 72