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ORDER NO. KM41407558SE

Digital Cordless Phone

B: Black Version
M: Metic Grey Version

2

PAGE

1 ORIGINAL SERVICE MANUAL INFORMATION ----------3
2 REPLACEMENT PARTS LIST ---------------------------------3

2.1. REFERENCE CHART ------------------------------------3
2.2. ORIGINAL AND NEW PARTS

COMPARISON LISTS ------------------------------------3

3 CHANGES (Suffix Code: E or later) -------------------------4

3.1. Technical Descriptions ------------------------------------4

3.1.1. Block Diagram (Base Unit)--------------------------4
3.1.2. Circuit Operation (Base Unit)-----------------------5
3.1.3. Block Diagram (Handset)----------------------------7
3.1.4. Circuit Operation (Handset)-------------------------8
3.1.5. Signal Route --------------------------------------------9

3.2. Troubleshooting Guide---------------------------------- 10

3.2.1. Check Power ----------------------------------------- 10
3.2.2. Check Battery Charge------------------------------ 11
3.2.3. Bell Reception---------------------------------------- 11
3.2.4. Troubleshooting by Symptom (Base Unit

and Charger Unit) ----------------------------------- 12

3.2.5. Troubleshooting by Symptom (Handset) ------ 13

3.3. Measurements and Adjustments --------------------- 16

3.3.1. Adjustment Standard (Base Unit) --------------- 16
3.3.2. Adjustment Standard (Handset) ----------------- 17

3.4. Schematic Diagram-------------------------------------- 18

3.4.1. Schematic Diagram (Base Unit) ----------------- 18
3.4.2. Schematic Diagram (Handset) ------------------- 20

3.5. Printed Circuit Board ------------------------------------ 23

3.5.1. Circuit Board (Base Unit_Main)------------------ 23
3.5.2. Circuit Board (Handset)---------------------------- 25

3.6. Miscellaneous --------------------------------------------- 27

3.6.1. Terminal Guide of the ICs, Transistors and

Diodes-------------------------------------------------- 27

3.7. Replacement Parts List --------------------------------- 28

3.7.1. Base Unit ---------------------------------------------- 28
3.7.2. Handset ------------------------------------------------ 29

3

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

Note:
Please refer to "1 ORIGINAL SERVICE MANUAL INFORMATION".

KX-TG6611RUB/KX-TG6611RUM/KX-TG6611UAB/KX-TG6611UAM/
KX-TG6611CAB/KX-TG6611CAM/KX-TG6612CAB/KX-TGA661RUB/
KX-TGA661RUM

CIS

KM41103335CE

D to E

D to E

KX-TG6612RUB/KX-TG6612RUM/KX-TGA661RUB/KX-TGA661RUM

Russia and Belarus

KM41204887SE

D to E

D to E

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:
To change Main board in base unit and handset board.
Change parts based on Suffix Code.

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

4

Analog

Front

End

To TEL_LINE

Bridge

Rect

 D3 D

3

Hook Switch

Q3,Q4,Q5Q

3

,Q

4

,Q

5

Audio

Bell/Caller ID

Interface

CPU

19

21

13

15

17

18

12

BELL

HOOK

Off-Hook Line Voltage

11

A/D

D/A

ADPCM

Codec Filter

DSP

Speech Encoding

Speech Decoding

BMC

Burst Encoding

Burst Decoding

RF

PLL 

3

1

87

7

8

EEPROM

SCL

SDA

46

66

67

AC Adaptor

ANDSET

Limit

Resistor

Charge

Detector

Power Failer Mode

Power Supply SW

      Q351,IC351

CHARGE(+)

CHARGE(-)

Optional

Optional

DC/DC convertorD

C

/D

C

 c

o

n

v

e

rt

o

r

IC2,L3,C36,Q602IC

2

,L

3

,C

3

6

,Q

6

0

2

Q8Q

8

1.8V

Reg.

2.85 V

3.0 V

1.8 V

BBIC

KX-TG6611 BLOCK DIA

GRAM 

(BASE UNIT)

MOD/DEMOD

Charge

Pump

DCDC

Converter

45

XTAL

X1X

1

10.368

MHz

RX

n

RX

p

TX

p

TX

n

TX

on

RX

on

D801

4

72

ANT1

ANT2

ANT1

ANT2

ANT1

ANT2

86

88

L1

L2

DCP

DCM

2

QSPI

FLASH MEMORY

IC431

44

3.0V

QSPI-CS 

DC,DCI

DC-CTRL

DC-SENSE 

QSPI-SCK 

QSPI-IO 0-3

47,48,

51,53

Q22,Q23

R55,R56,

D22

52

49

30 
29

31

QSPI

Control