DOWNLOAD Panasonic KX-TCA275RU Service Manual ↓ Size: 3.71 MB | Pages: 72 in PDF or view online for FREE

ORDER NO. KMS0909724CE

(for Russia)

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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

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• Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires,

injury or electric shock, which can be caused by improper repair work.

1. When repair services are provided, neither the products nor their parts or members shall be remodeled.
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.

• ICs and LSIs are vulnerable to static electricity.

When repairing, the following precautions will help prevent recurring malfunctions.

1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that con-
tains lead.
We will use PbF when discussing the lead free solder used in our manufacturing process which is made from Tin, (Sn), Silver,
(Ag), and Copper, (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder. 

• PbF solder has a melting point that is 50

° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with tempera-

ture control and adjust it to 700

° ± 20° F, (370° ± 10°C). 

Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.

• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100

°F, (600°C).

• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the

opposite side (See figure, below).

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper,
(Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac
turer's specific instructions for the melting points of their products and any precautions for using their product with other 
materials. 
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

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1. Danger of explosion if battery is incorrectly replaced. 
1. Replace only with the same or equivalent type recommended by the manufacturer.
1. Dispose of used batteries according to the manufacture's Instructions.

When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.