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 ORDER NO. KM41404462SE

Digital Cordless Phone
Digital Cordless Answering System

M: Metic Grey Version
S: Silver Version
T: Titanium Black Version

2

PAGE

PAGE

1 ORIGINAL SERVICE MANUAL INFORMATION ----------4
2 REPLACEMENT PARTS LIST ---------------------------------4

2.1. REFERENCE CHART ------------------------------------4
2.2. ORIGINAL AND NEW PARTS COMPARISON

LISTS----------------------------------------------------------4

3 Safety Precautions -----------------------------------------------6

3.1. For Service Technicians ----------------------------------6

4 Warning --------------------------------------------------------------6

4.1. Battery Caution ---------------------------------------------6
4.2. About Lead Free Solder (Pbf: Pb free) ---------------6
4.3. Discarding of P.C. Board ---------------------------------7

5 Specifications ------------------------------------------------------8
6 Technical Descriptions------------------------------------------9

6.1. Block Diagram (Base Unit) ------------------------------9
6.2. Circuit Operation (Base Unit) ------------------------- 10
6.3. Block Diagram (Base Unit RF Part) ----------------- 11
6.4. Circuit Operation (Base Unit) ------------------------- 12
6.5. Block Diagram (Handset) ------------------------------ 15
6.6. Circuit Operation (Handset) --------------------------- 16
6.7. Circuit Operation (Charger Unit) --------------------- 17
6.8. Signal Route----------------------------------------------- 18

7 Location of Controls and Components------------------ 20
8 Installation Instructions--------------------------------------- 20
9 Operating Instructions ---------------------------------------- 20

9.1. For Service Hint ------------------------------------------ 20

10 Service Mode ----------------------------------------------------- 21

10.1. Engineering Mode---------------------------------------- 21
10.2. EEPROM LAYOUT (Handset) ------------------------ 25
10.3. Copying Phonebook Items when Repairing ------- 26
10.4. How to Clear User Setting ----------------------------- 28

11 Troubleshooting Guide --------------------------------------- 29

11.1. Troubleshooting Flowchart ---------------------------- 29
11.2. Troubleshooting by Symptom 

(Base Unit and Charger Unit)------------------------- 40

11.3. Troubleshooting by Symptom (Handset) ---------- 42

12 Disassembly and Assembly Instructions -------------- 46

12.1. Disassembly Instructions ------------------------------ 46
12.2. How to Replace the Handset LCD ------------------ 49

13 Measurements and Adjustments -------------------------- 50

13.1. Equipment Required ------------------------------------ 50
13.2. The Setting Method of JIG (Base Unit) ------------ 50
13.3. Adjustment Standard (Base Unit)-------------------- 52
13.4. Adjustment Standard (Charger Unit)---------------- 53
13.5. The Setting Method of JIG (Handset) -------------- 54
13.6. Adjustment Standard (Handset) --------------------- 56
13.7. Things to Do after Replacing IC or X'tal ----------- 57
13.8. RF Specification------------------------------------------ 59
13.9. How to Check the Handset Speaker 

or Receiver ------------------------------------------------ 60

13.10. Frequency Table (MHz) -------------------------------- 60

14 Miscellaneous --------------------------------------------------- 61

14.1. How to Replace the Flat Package IC --------------- 61
14.2. How to Replace the Shield Case -------------------- 63

15 Schematic Diagram -------------------------------------------- 65

15.1. For Schematic Diagram -------------------------------- 65
15.2. Base Unit (Main) ----------------------------------------- 66
15.3. Handset ---------------------------------------------------- 68
15.4. Charger Unit ---------------------------------------------- 70

16 Printed Circuit Board------------------------------------------ 71

16.1. Base Unit (Main) ----------------------------------------- 71

There are special components used in this equipment which are important for safety. These parts are marked by 
in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that 
these critical parts should be replaced with manufacturer's specified parts to prevent shock, fire or other hazards.
Do not modify the original design without permission of manufacturer.

If lead free solder was used in the manufacture of this product, the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the 
use of PbF and how it might be permissible to use Pb solder during service and repair work.

L When you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit. 
L The illustrations in this Service Manual may vary slightly from the actual product.

3

16.2. Handset -----------------------------------------------------73
16.3. Charger Unit -----------------------------------------------75

17 Exploded View and Replacement Parts List -----------76

17.1. Cabinet and Electrical Parts (Base Unit) -----------76
17.2. Cabinet and Electrical Parts (Handset) -------------77
17.3. Cabinet and Electrical Parts (Charger Unit) -------78
17.4. Accessories ------------------------------------------------79
17.5. Replacement Part List-----------------------------------80

4

Serial No.Label tells you the suffix code as follows.

KX-TG2511CAM/KX-TG2511CAS/KX-TG2511CAT/KX-TG2512CAM/
KX-TG2512CAT/KX-TGA250RUM/KX-TGA250RUS/KX-TGA250RUT

Kazakhstan, Tajikistan, Uzbeki-

stan, Turkmenistan and Kyr-

gyzstan

KM41006113CE

B to D

A to D

KX-TG2521CAT/KX-TGA251RUT

Kazakhstan, Tajikistan, Uzbeki-

stan, Turkmenistan and Kyr-

gyzstan

KM41007180CE

B to D

A to D

Reason for Change
*The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS 
COMPARISON LISTS.
1. Improve performance

Note:
When changing main board in base unit or handset board for suffix C or older,
parts with *1 marking have been changed at the same time for both main and handset board.
All old parts are discontinued for suffix C or older.

2. Change of material or dimension
3. To meet approved specification
4. Standardization
5. Addition
6. Deletion
7. Correction
8. Other

t ese c t ca pa ts s ou d be ep aced

t

a u actu e s spec ed pa ts to p e e t s oc ,

e o ot e

a a ds

Do not modify the original design without permission of manufacturer.

If lead free solder was used in the manufacture of this product, the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the 
use of PbF and how it might be permissible to use Pb solder during service and repair work.

L When you note the serial number, write down all 11 digits. The serial number may be found on the bottom of the unit. 
L The illustrations in this Service Manual may vary slightly from the actual product.

Ref. No.

Part No.

Part Name & Description 

Pcs/

Set

Remarks

Time of Change

Original (Old)

(Suffix)

Cabinet and Electrical Parts (Base Unit) 
6

PNLA1030Z

ANTENNA *1

1

--

4

Y

*2

7

PNYE1027Z

SPACER, ANTENNA

*1

0

--

6

Y

*2

Main P.C. Board Parts (Base Unit) 
PCB1

PNWPG2511CAH

MAIN P.C.BOARD ASS'Y
(RTL) (for KX-TG2511CA) 

*1

1

--

8

Y

*2

PCB1

PNWPG2521CAH

MAIN P.C.BOARD ASS'Y
(RTL) (for KX-TG2521CA)

*1

1

--

8

Y

*2

IC401

PNWITG6511EH

IC (EEPROM) 
(for KX-TG2511CA)

*1

0

--

6

Y

*2