KX-TCA285RU - Panasonic Telephone Service Manual (repair manual). Page 2

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

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

2 Warning --------------------------------------------------------------4

2.1. About Lead Free Solder (PbF: Pb free) --------------4

2.1.1. Suggested PbF Solder -------------------------------4

2.2. Discarding of P. C. Board --------------------------------4

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

4.1. Block Diagram ----------------------------------------------6
4.2. Circuit Operations ------------------------------------------7

4.2.1. Outline----------------------------------------------------7
4.2.2. Power Supply Circuit / Reset Circuit--------------7
4.2.3. Reset Circuit --------------------------------------------7
4.2.4. Clock Circuit --------------------------------------------8
4.2.5. Bus Access ---------------------------------------------8
4.2.6. Charge circuit  ------------------------------------------8
4.2.7. Battery Low/Power Down Detector ---------------9
4.2.8. LCD Circuit -------------------------------------------- 10
4.2.9. LED Circuit -------------------------------------------- 11

4.2.10. Vib Circuit---------------------------------------------- 11

4.2.11. RF Circuit ---------------------------------------------- 12

4.2.12. Bluetooth Circuit ------------------------------------- 13
4.2.13. TX Audio Path---------------------------------------- 14
4.2.14. RX Audio Path --------------------------------------- 15

5 Location of Controls and Components------------------ 16

5.1. Name of Controls----------------------------------------- 16

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

6.1. Charger Connection ------------------------------------- 18
6.2. Battery ------------------------------------------------------ 18

6.2.1. Battery Installation ---------------------------------- 18
6.2.2. Charging the Battery-------------------------------- 18
6.2.3. Battery Information---------------------------------- 19
6.2.4. Low Battery Warning ------------------------------- 19
6.2.5. Replacing the Battery ------------------------------ 19

7 Operating Instructions ---------------------------------------- 20

7.1. Soft Keys --------------------------------------------------- 20
7.2. Handset Setting Menu Layout ------------------------ 22
7.3. Key Lock---------------------------------------------------- 23
7.4. Selecting the Display Language---------------------- 23
7.5. Display ------------------------------------------------------ 23
7.6. Function Menus------------------------------------------- 24
7.7. Function Keys --------------------------------------------- 25
7.8. Flexible Keys ---------------------------------------------- 26
7.9. Caller ID ---------------------------------------------------- 27

7.10. Character Mode Table ---------------------------------- 28

8 Firmware Version up ------------------------------------------- 29
9 Troubleshooting Guide---------------------------------------- 32

9.1. Power ON NG--------------------------------------------- 32
9.2. No Display ------------------------------------------------- 33
9.3. LED Trouble ----------------------------------------------- 34

9.3.1. Key backlight does not light----------------------- 34
9.3.2. Charge LED (BELL LED) does not light ------- 34

9.4. Charge problem ------------------------------------------ 36

9.4.1. Handset ------------------------------------------------ 36
9.4.2. Charger ------------------------------------------------ 37

9.5. Vibrator Trouble------------------------------------------- 38
9.6. RF Trouble ------------------------------------------------- 39

9.6.1. No Link problem (DECT) -------------------------- 39

9.6.2. No Link problem (BT) ------------------------------ 40

9.7. STM (Start Monitor) ------------------------------------- 40
9.8. Error Message-------------------------------------------- 41

9.8.1. Need Repair  ----------------------------------------- 41
9.8.2. “ERROR 1”, “ERROR 2” -------------------------- 41

10 Disassembly and Assembly Instructions -------------- 42

10.1. Handset ---------------------------------------------------- 42
10.2. Charger Unit ---------------------------------------------- 42

11 Measurements and Adjustments -------------------------- 43

11.1. Check Procedure (Handset) -------------------------- 43

11.1.1. Preparation ------------------------------------------- 43
11.1.2. PC Setting -------------------------------------------- 43

11.2. Adjustment (Handset) ---------------------------------- 45

11.2.1. Equipment Required ------------------------------- 45
11.2.2. The Setting Method of JIG------------------------ 45
11.2.3. Connections (Handset) ---------------------------- 45

12 Miscellaneous --------------------------------------------------- 48

12.1. Terminal Guide of the ICs Transistors and

Diodes ------------------------------------------------------ 48

12.1.1. Handset ----------------------------------------------- 48
12.1.2. Charger ------------------------------------------------ 48

12.2. How To Replace a Flat Package IC ----------------- 49

12.2.1. Preparation ------------------------------------------- 49
12.2.2. Removal Procedure -------------------------------- 49
12.2.3. Procedure--------------------------------------------- 49
12.2.4. Removing Solder From Between Pins--------- 49

12.3. How to Replace the LLP (Leadless Leadframe

Package) IC ----------------------------------------------- 50

12.3.1. Preparation ------------------------------------------- 50
12.3.2. Caution ------------------------------------------------ 50
12.3.3. How to Remove the IC ---------------------------- 50
12.3.4. How to Install the IC -------------------------------- 50
12.3.5. How to Remove a Solder Bridge---------------- 51

13 Schematic Diagram -------------------------------------------- 52

13.1. Handset ---------------------------------------------------- 52
13.2. Charger----------------------------------------------------- 56

14 Printed Circuit Board------------------------------------------ 57

14.1. Handset ---------------------------------------------------- 57

14.1.1. Component View ------------------------------------ 57
14.1.2. Bottom View ------------------------------------------ 58

14.2. Charger----------------------------------------------------- 59

15 Appendix Information of Schematic Diagram -------- 60
16 Exploded View and Replacement Parts List----------- 61

16.1. IC Data ----------------------------------------------------- 61

16.1.1. IC1 (APU) --------------------------------------------- 61
16.1.2. IC100 (DPU) ----------------------------------------- 63

16.2. Cabinet and Electric Parts----------------------------- 66

16.2.1. Handset ----------------------------------------------- 66
16.2.2. Charger Unit------------------------------------------ 67

16.3. Accessories and Packing Materials ----------------- 68
16.4. Replacement Parts List -------------------------------- 69

16.4.1. Handset ----------------------------------------------- 69
16.4.2. Charger Unit------------------------------------------ 71
16.4.3. Accessories and Packing Materials ------------ 71
16.4.4. Fixtures and Tools ---------------------------------- 71