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ORDER NO. KMS1110856CE

(for Europe, Asia Oceania, Middle Near East, Latin
America, Russia and Africa)

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PAGE

PAGE

1 Safety Precautions -----------------------------------------------4

1.1. For Service Technicians  ---------------------------------4
1.2. Insulation Resistance Test -------------------------------4

2 Warning --------------------------------------------------------------5

2.1. Caution--------------------------------------------------------5
2.2. About Lead Free Solder (PbF: Pb free) --------------5

2.2.1. Suggested PbF Solder -------------------------------5

2.3. Discarding of P. C. Board --------------------------------5

3 Specifications ------------------------------------------------------6

3.1. General Description ---------------------------------------6
3.2. System Capacity -------------------------------------------6

3.2.1. Power Supply Unit Selection -----------------------6

4 Technical Descriptions------------------------------------------7

4.1. Power Supply Unit Circuit Operation------------------7
4.2. PSU (KX-TDA0103X/KX-TDA0103XJ) ---------------7

4.2.1. Block Diagram------------------------------------------7

4.3. Circuit Description------------------------------------------8

4.3.1. AC Section ----------------------------------------------8
4.3.2. Rectifier and PFC Circuit ----------------------------9
4.3.3. Main Convertor--------------------------------------- 10
4.3.4. 15V Output Circuit----------------------------------- 11
4.3.5. 15VP Output Circuit--------------------------------- 11
4.3.6. 30V Output Circuit----------------------------------- 12
4.3.7. 41V Output Circuit----------------------------------- 12
4.3.8. Alarm Signal Output -------------------------------- 13
4.3.9. Protection Circuit ------------------------------------ 14

4.3.10. Battery Backup Circuit ----------------------------- 15

4.4. PSU (KX-TDA0104X/KX-TDA0104XJ) ------------- 16

4.4.1. Block Diagram---------------------------------------- 16

4.5. Circuit Description---------------------------------------- 16

4.5.1. AC Section -------------------------------------------- 16
4.5.2. Rectifier and PFC Circuit -------------------------- 17
4.5.3. Main Convertor--------------------------------------- 18
4.5.4. 15V Output Circuit----------------------------------- 18
4.5.5. 15VP Output Circuit--------------------------------- 19
4.5.6. 30V Output Circuit----------------------------------- 19
4.5.7. 41V Output Circuit----------------------------------- 20
4.5.8. Alarm Signal Output -------------------------------- 20
4.5.9. Protection Circuit ------------------------------------ 21

4.5.10. Battery Backup Circuit ----------------------------- 22

5 Location of Controls and Components------------------ 23

5.1. Installing/Replacing the Power Supply Unit ------- 23

5.1.1. Function------------------------------------------------ 23

5.2. Installing the Power Supply Unit---------------------- 24
5.3. Replacing the Power Supply Unit -------------------- 25

6 Troubleshooting Guide---------------------------------------- 26

6.1. KX-TDA0103X/KX-TDA0103XJ Power Unit 

Troubleshooting ------------------------------------------ 26

6.1.1. All Outputs no voltage ( 15V, 15Vpt, 41V, 

30V all no voltage ) --------------------------------- 26

6.1.2. Table ---------------------------------------------------- 27
6.1.3. Only 15Vpt/30V no voltage ( 15V, 41V 

have output voltage ) ------------------------------- 28

6.1.4. Table ---------------------------------------------------- 28
6.1.5. Only 41V no voltage ( 15V, 15Vpt and 30V 

have output voltage ) ------------------------------- 29

6.1.6. Table ---------------------------------------------------- 29

6.1.7. Only 41V has voltage ( 15V, 15Vpt, 30V no 

output voltage ) -------------------------------------- 29

6.1.8. Table --------------------------------------------------- 29
6.1.9. Only 15V no voltage ( 15Vpt, 41V, 30V 

have output voltage )------------------------------- 30

6.1.10. Table --------------------------------------------------- 30

6.1.11. Only 15Vpt no voltage ( 15V, 41V, 30V 

have output voltage )------------------------------- 31

6.1.12. Table --------------------------------------------------- 31
6.1.13. Only 30V no voltage ( 15V, 15Vpt, 41V 

have output voltage )------------------------------- 32

6.1.14. Table --------------------------------------------------- 32
6.1.15. All Secondary output operation are normal 

but DC ALM high------------------------------------ 33

6.1.16. Table --------------------------------------------------- 33
6.1.17. Fan not stop but FAN ALM (Low) activated -- 34
6.1.18. Table --------------------------------------------------- 34
6.1.19. AC Supply are normal and All Output 

Voltage operates Normally but AC Alm 
High ---------------------------------------------------- 35

6.1.20. Table --------------------------------------------------- 35
6.1.21. Battery Charging, Backup function not 

working ------------------------------------------------ 36

6.1.22. Table --------------------------------------------------- 37

6.2. KX-TDA0104X/KX-TDA0104XJ Power Unit 

Troubleshooting ------------------------------------------ 38

6.2.1. All Outputs no voltage ( 15V, 15Vpt, 41V, 

30V all no voltage ) --------------------------------- 38

6.2.2. Table --------------------------------------------------- 39
6.2.3. Only 15Vpt/30V no voltage ( 15V, 41V 

have output voltage )------------------------------- 39

6.2.4. Table --------------------------------------------------- 39
6.2.5. Only 41V has voltage ( 15V, 15Vpt, 30V no 

output voltage ) -------------------------------------- 40

6.2.6. Table --------------------------------------------------- 40
6.2.7. Only 41V no voltage ( 15V, 15Vpt, 30V 

have output voltage )------------------------------- 41

6.2.8. Table --------------------------------------------------- 41
6.2.9. Only 15Vpt no voltage ( 15V, 41V, 30V 

have output voltage )------------------------------- 42

6.2.10. Table --------------------------------------------------- 42

6.2.11. Only 15V/15Vpt no voltage ( 41V, 30V 

have output voltage )------------------------------- 43

6.2.12. Table --------------------------------------------------- 43
6.2.13. Only 30V no voltage ( 15V, 15Vpt, 41V 

have output voltage )------------------------------- 44

6.2.14. Table --------------------------------------------------- 44
6.2.15. All Secondary output operation are normal 

but DC ALM high------------------------------------ 45

6.2.16. Table --------------------------------------------------- 45
6.2.17. AC Supply are normal and All Output 

Voltage operates Normally but AC Alm 
High ---------------------------------------------------- 46

6.2.18. Table --------------------------------------------------- 46
6.2.19. Battery Charging, Backup function not 

working ------------------------------------------------ 47

6.2.20. Table --------------------------------------------------- 48

7 Service Fixture & Tools--------------------------------------- 49

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7.1. Extension Cord for Servicing --------------------------49

8 Disassembly and Assembly Instructions ---------------50

8.1. KX-TDA0103X/KX-TDA0103XJ-----------------------50
8.2. KX-TDA0104X/KX-TDA0104XJ-----------------------52

9 Miscellaneous ----------------------------------------------------53

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

9.1.1. Preparation --------------------------------------------53
9.1.2. Removal Procedure ---------------------------------53
9.1.3. Procedure----------------------------------------------53
9.1.4. Removing Solder From Between Pins ---------53

10 Schematic Diagram ---------------------------------------------55

10.1. KX-TDA0103X/KX-TDA0103XJ-----------------------55
10.2. KX-TDA0104X/KX-TDA0104XJ-----------------------65

11 Printed Circuit Board-------------------------------------------74

11.1. KX-TDA0103X/KX-TDA0103XJ-----------------------74

11.1.1. Main Board --------------------------------------------74
11.1.2. 30V Board ---------------------------------------------76
11.1.3. Battery Board -----------------------------------------77
11.1.4. Filter Board --------------------------------------------79

11.2. KX-TDA0104X/KX-TDA0104XJ-----------------------80

11.2.1. Main Board --------------------------------------------80
11.2.2. Battery Board -----------------------------------------82
11.2.3. Filter Board --------------------------------------------84
11.2.4. Module Board-----------------------------------------85

12 Appendix Information of Schematic Diagram ---------87
13 Exploded View and Replacement Parts List -----------88

13.1. Cabinet and Electrical Parts Location ---------------88

13.1.1. KX-TDA0103X/KX-TDA0103XJ------------------88
13.1.2. KX-TDA0104X/KX-TDA0104XJ------------------89

13.2. Accessories and Packing Materials------------------91

13.2.1. KX-TDA0103X----------------------------------------91
13.2.2. KX-TDA0103XJ --------------------------------------92
13.2.3. KX-TDA0104X----------------------------------------93
13.2.4. KX-TDA0104XJ --------------------------------------94

13.3. Replacement Part List-----------------------------------95

13.3.1. KX-TDA0103X/KX-TDA0103XJ  -----------------95
13.3.2. KX-TDA0104X/KA-TDA0104XJ---------------- 101
13.3.3. Fixtures----------------------------------------------- 105

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1. Before servicing, unplug the AC power cord to prevent an electric shock.
2. When replacing parts, use only the manufacturer's recommended components.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to perform the following insulation resistance test to prevent 

the customer from being exposed to shock hazards.

• 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.

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as 

screw threads, control shafts, handle brackets, etc.
Note:

Some exposed parts may be isolated from the chassis by design. These will read infinity.

4. If the measurement is outside the specified limits, there is a possibility of shock hazard. The equipment should be repaired 

and rechecked before it is returned to the customer.