Panasonic KX-TC1205RUW, KX-TC1205RUS, KX-TC1205RUB, KX-TC1205RUF User Manual

ORDER NO. KM40204852C3

Telephone Equipment

KX-TC1205RUB
KX-TC1205RUW
KX-TC1205RUS
KX-TC1205RUF

Cordless Phone

Black Version
White Version
Silver Version
Blue Version

(for Russia)

© 2002 Kyushu Matsushita Electric Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

CONTENTS

Page Page

1 BATTERY 4

1.1. Recharge

1.2. Battery information

2 BATTERY REPLACEMENT
3 LOCATION OF CONTROLS

3.1. Base Unit

3.2. Handset

4 CONNECTION

4.1. Adding Another Phone

5 OPERATIONS

5.1. Making Calls

5.2. Answering Calls

5.3. Storing Phone Numbers in Memory

5.4. Storing a Phone Number in the DIRECT Button

5.5. Dialing a Stored Number

5.6. Dialing a Stored Number in the DIRECT Button

5.7. FLASH Button

6 DISASSEMBLY INSTRUCTIONS
7 TROUBLESHOOTING GUIDE

7.1. Check Power

7.2. Bell Reception

7.3. Check Battery Charge

7.4. Check Link

7.5. Check Handset Transmission

7.6. Check Handset Reception

10

10
10
11
11
12
12
13

14
16

17
18
19
20
22
22

8 ADJUSTMENTS (BASE UNIT)

4
4

5
6

6
6

7

9

8.1. Test Mode Flow Chart (Base Unit)

8.2. How to change the channel

8.3. Adjustment

8.4. Adjustment Standard (Base Unit)

9 ADJUSTMENTS (HANDSET)

9.1. Test Mode Flow Chart (Handset)

9.2. How to change the channel

9.3. Adjustment

9.4. Adjustment Standard (Handset)

10 R F SPECIFICAT ION

10.1. Base Unit

10.2. Handset

11 HOW TO CHECK THE HANDSET SPEAKER
12 FREQUENCY TABLE (MHz)
13 EXPLANATION OF CPU DATA COMMUNICATION

13.1. STAND-BY -> TALK, TALK -> STAND-BY

13.2. Ringing

13.3. Changing the Channel

13.4. Ports for transmitting and receiving of data

13.5. Waveform of DATA used for cordless transmission and
reception

14 BLOCK DIAGRAM (BASE UNIT)
15 BLOCK DIAGRAM (HANDSET)
16 CIRCUIT OPERATION

23

23
24
24
25

26

26
27
27
28

30

30
30

30
31
32

32
33
34
35

35

36
37
38

2

16.1. Outline 38

16.2. Power Supply Circuit

16.3. Reset Circuit (Base Unit)

16.4. Charge Circuit

16.5. Telephone Line Interface

16.6. Transmitter/Receiver

16.7. Signal Route

17 CIRCUIT OPERATION (HANDSET)

17.1. Reset Circuit (Handset)

17.2. Battery Low / Power Down Detector

18 CP U DATA (Base Unit)

18.1. IC2

19 CP U DATA (Handset)

19.1. IC2

20 HOW TO REPLACE FLAT PACKAGE IC

20.1. Preparation

20.2. Procedure

20.3. Modification Procedure of Bridge

21 CABINET AND ELECTRICAL PARTS LOCATION (BASE UNIT)

22 CABINET AND ELECTRICAL PARTS LOCATION (HANDET)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

23 ACCESSORIES AND PACKING MATERIALS
24 REPLACEMENT PARTS LIST

39
40
41
41
42
44

45

45
46

47

47

48

48

49

49
49
49

24.1. Base Unit

24.2. Handset

24.3. ACCESSORIES AND PACKING MATERIALS

25 FOR SCHEMATIC DIAGRAM

25.1. Base Unit (SCHEMATIC DIAGRAM (Base Unit))

25.2. Handset (SCHEMATIC DIAGRAM (Handset))

26 SCHEMATIC DIAGRAM (Base Unit)

26.1. Base Unit

26.2. RF Unit (Base Unit)

27 SCHEMATIC DIAGRAM (Handset)

27.1. Handset

27.2. RF Unit (Handset)

28 CIRCUIT BOARD (Base Unit)

28.1. Component View

28.2. Flow Solder Side View

29 CIRCUIT BOARD (Handset)

29.1. Component View

50

29.2. Flow Solder Side View

51

52
53

53
56
58

59

59
59

60

60
61

62

62
63

65

65
66

67

67
68

3

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

1 BATTERY

1.1. Recharge

1.2. Battery information

4

2 BATTERY REPLACEMENT

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

5

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

3 LOCATION OF CONTROLS

3.1. Base Unit

3.2. Handset

6

4 CONNECTION

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

• • USE ONLY WITH Panasonic AC ADAPTOR PQLV16CEZ.

• • The AC adaptor must remain connected at all times.

(It is normal for the adaptor to feel warm during use.)

• • When more than one unit is used, the units may interfere with each other. To prevent or reduce interference, please leave
ample space between the base units.

7

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

8

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

4.1. Adding Another Phone

This unit will not function during a power failue. To connect a standard telephone on the same line, use a telephone T-adaptor.

9

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

5 OPERATIONS

5.1. Making Calls

5.2. Answering Calls

10

5.3. Storing Phone Numbers in Memory

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

5.4. Storing a Phone Number in the DIRECT Button

11

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

5.5. Dialing a Stored Number

5.6. Dialing a Stored Number in the DIRECT Button

12

5.7. FLASH Button

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

13

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

6 DISASSEMBLY INSTRUCTIONS

Show in Fig. To remove. Remove.

1 Lower Cabinet Screws (2.6 × 12)....................... (A) × 4

2 Main P.C. Board Screws (2.6 × 6)......................... (B) × 1

Screws (2.6 × 6)..........................(C) × 2

Screws (2.6 × 12)........................(D) × 1

Main P.C. Board.

14

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Show in Fig. To remove. Remove.

3 Rear Cabinet Battery compartment cover.

4 Screws (2.6 × 12)......................(E) × 2

5 Main P. C. Board Screw (2.6 × 12)........................(F) × 1

Tape and solder.
Main P. C. Board.

15

KX-TC1205RUB / KX-TC1205R UW / KX-TC1205RUS / KX-TC1205RUF

7 TROUBLESHOOTING GUIDE

Cross Reference:

Check Power (P.17)
Bell Reception (P.18)
Check Battery Charge (P.19)
Check Link (P.20)
Check Handset Transmission (P.22)
Check Handset Reception (P.22)

16

7.1. Check Power

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Cross Reference:

Reset Circuit (Base Unit) (P.40)
Power Supply Circuit (P.39)

Cross Reference:

Charge Circuit (P.41)

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset) (P.67)

Note:

CPU: IC2

Note:

CPU: IC2

17

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

7.2. Bell Reception

Cross Reference:

Check Link (P.20)
Telephone Line Interface (P.41)

Cross Reference:

Check Link (P.20)

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset) (P.67)

Note:

CPU: IC2

18

7.3. Check Battery Charge

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Cross Reference:

Charge Circuit (P.41)
Power Supply Circuit (P.39)

Cross Reference:

Reset Circuit (Handset) (P.45)

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset) (P.67)

Note:

CPU: IC2

Note:

CPU: IC2

19

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

7.4. Check Link

**: Refer to Adjustment (P.24) Note:

CPU: IC2
RF IC: IC1

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset) (P.67)

20

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

**: Refer to Adjustment (P.27). Note:

CPU: IC2
RF IC: IC1

*: Each measurement points are shown in CIRCUIT BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset) (P.67)

21

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

7.5. Check Handset Transmission

Cross Reference:

Signal Route (P.44)

7.6. Check Handset Reception

Cross Reference:

Signal Route (P.44)

*: Each measurement points are shown in CIRCUIT
BOARD (Base Unit) (P.65) or CIRCUIT BOARD (Handset)

(P.67)

22

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

8 ADJUSTMENTS (BASE UNIT)

If your unit have below symptoms, adjust or confirm each item using remedy column from the table.

Symptom Remedy*
The base unit dose not respond to a call from handset. Make adjustments in item (A)
The base unit dose not transmit or the transmit frequency is off. Make adjustments in item (B)
The transmit frequency is off. Make confirmation in item (C)
The transmit power outlet is low, and the operating distance between the base unit and the

handset is less than normal.
The reception sensitivity of base unit is low with noise. Make confirmation in item (E)
The transmit level is high or low. Make confirmation in item (F)
The reception level is high or low. Make adjustments in item (G)
The unit does not link. Make confirmation in item (H)

*: Refer to Adjustment (P.24).

8.1. Test Mode Flow Chart (Base Unit)

The operation-flow of Test mode and main check items are shown below.

Make confirmation in item (D)

Note:

**: Refer to the above table.

23

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

8.2. How to change the channel

*: Refer to Flow Solder Side View (P.66).

8.3. Adjustment

Adjustment Items Test Mode Adjustment

(A) RX VCO

Confirmation

(B) TX VCO

Adjustment

(C) TX Frequency

Adjustment

(D) TX Power

Adjustment

(E) RX Sensitivity

Adjustment (2nd
IF output)

(F) Line Output Level

Confirmation

(G) Line Input

Modulation
Confirmation

(H) Noise Squelch

Confirmation

3ch Talk -

3ch Talk T6

3ch Talk VC1

3ch Talk T5

3ch Talk T2 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.

3ch Talk - 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.

3ch Talk - 1. Input via loop simulator 1.0KHz, 80mV (measured at T-R) signal.

3ch Talk - 1. Measure the SSG output level when the noise squelch changes from Low

Point

*Procedure Check or

• • Confirm so that the reading of the Digital Voltmeter is 1.5V ± 0.5V.

• • Adjust T6 so that the reading of the Digital Voltmeter is 2.0V ± 0.1V.

• • Adjust VC1 so that the reading of the frequency counter is 30.175MHz ±

0.1KHz.

• • Adjust T5 so that the reading of the RF VTVM is over 10dBm.

0KHz).

2. Adjust T2 so that the reading of RF VTVM is the maximum value (more
than 20mV)

3KHz).

2. Confirm that the reading of AF VTVM is 80mV ± 20mV (600Ω load).

2. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.
0KHz).

3. Confirm so that the reading of FM Deviation Meter is 2.8KHz ± 0.3KHz.

to High.

2. Confirm so that the SSG output level is -105dBm ~ -110dBm.

Replace

Parts

IC1, L10,

C26

IC1, DV1,

T6

IC1, X1,

T6,

DV1, C35,

C40, VC1

IC1, Q3,
Q4, Q5,

T5, DPX1

DPX1, T2,

CF1, CF2

IC1, Q11

IC1, DV1

IC1, DPX1

* : The connection of adjustment equipment are as shown in Adjustment Standard (Base Unit) (P.25).
SSG Frequency: 39.875 MHz

24

8.4. Adjustment Standard (Base Unit)

25

DC12V or
AC adaptor

AF OSC

Loop
SIMULATOR

FM Deviation
Meter

Frequency
Counter

RF
Volt Meter

50Ω

SSG

TXPOWER TXGND

Audio
Analyzer

(G)

(C)

(D)

Confirmation of VCO voltage

DC Volt Meter

(A), (B)

TX-VCORX-VCO

RF Volt
Meter

(E)

T.P ( CH change at test mode)

IC1

IC2

AF Volt Meter (F)

Note: (A) - (H) is refered to ADJUSTMENTS (BASE UNIT) (P.23)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

IC3

IC6

Oscilloscope (H)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

9 ADJUSTMENTS (HANDSET)

If your unit have below symptoms, adjust or confirm each item using remedy column from the table.

Symptom Remedy*
The movement of Battery Low Indicator is wrong. Make confirmation in item (A)
The base unit does not respond to a call from the handset. Make adjustments in item (B)
The base unit does not transmit or the transmit frequency is off. Make adjustments in item (C)
The transmit frequency is off. Make confirmation in item (D)
The transmit power outlet is low, and the operating distance between the base unit and the

handset is less than normal.
The reception sensitivity of base unit is low with noise. Make confirmation item (F)
Does not link between the base unit and the handset. Make confirmation in item (G)
The reception level is high or low. Make confirmation item (H)
The transmit level is high or low. Make adjustments in item (I)

*: Refer to Adjustment (P.27).

Unit condition:

1. Remove the antenna lead wire from P.C Board of the handset.

2. Power Supply: DC 3.9V (DC power supply)

3. Volume: HIGH (When P.C. Board of handset is in test mode, volume condition is medium. Press “LOCATOR” key once.)

4. Speaker Load: 150Ω

CH TX Frequency RX Frequency

CH3 39.875MHz 30.175MHz

Make confirmation in item (E)

9.1. Test Mode Flow Chart (Handset)

Note:

Refet to CIRCUIT BOARD (Handset) (P.67)
Signal Route (P.44)

26

9.2. How to change the channel

9.3. Adjustment

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Adjustment Items Test Mode Adjustment

(A) Battery Low

Confirmation

(B) TX VCO

Voltage

(C) RX VCO

Confirmation

(D) TX Frequency

Adjustment

(E) TX Power

Adjustment

(F) RX Sensitivity

Adjustment
(2nd IF output)

(G) Noise Squelch

Confirmation

(H) Speaker

Output Level
confirmation

(I) Mic Modulation

Factor
Confirmation

(J) Data

Modulation
Confirmation

3ch Talk - 1. Set the power supply voltage to DC3.60V, and confirm so that the reading

3ch Talk T6 1. Adjust T6 so that the reading of the Digital Voltmeter is 1.0V ± 0.1V. IC1, X1,

3ch Talk -

3ch Talk VC1

3ch Talk T5

3ch Talk T3 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.

3ch Talk - 1. Measure the SSG output level when the noise squelch changes from Low

3ch Talk - 1. Apply -60dBm output from S.S.G. (modulation frequency 1KHz, dev.

3ch Talk - 1. Apply a MIC signal (1KHz, 2.4mV at 600Ω load).

3ch Talk -

Point

Procedure Check or

of oscillosope is High.

2. Set the power supply voltage to DC 3.40V, and confirm so that the
reading of oscilloscope is Low.

• • Confirm RX VCO voltage so that the reading of the Digital Voltmeter is

2.9V ± 0.5V.

• • Adjust VC1 so that the reading of the frequency counter is 39.875MHz ±

0.1KHz.

• • Adjust T5 so that the reading of the RF VTVM (50Ω load) is 5dBm ±
1dBm.

0KHz).

2. Adjust T3 so that the reading of RF VTVM is more than 15mV.

to High. (modulation frequency 1KHz, dev.3kHz)

2. Confirm so that the SSG output level is -105dBm.

3KHz).

2. Confirm so that SP output level is 120mV ± 30mV.
(distortion: less than 7%) (volume High).

2. Confirm so that the reading FM Deviation Meter is 3.1KHz ± 0.4KHz.

• • Confirm so that the reading of the FM Deviation Meter is 5kHz ± 1kHz.

Replace

Parts

IC1

T6

IC1, X1,

T6

L6, C24

IC1, VC1

DPX1, T5

DPX1, Q5,

T5

DPX1,

T3,IC1,

CF1, CF2

IC1, DPX1

IC1

IC1, DV1

The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.28).
SSG Frequency: 30.175 MHz

27

9.4. Adjustment Standard (Handset)

(Component View)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

28

150Ω

AF Volt Meter (H)

IC2

(A) Battery Low

(G) Noise Squelch

Oscilloscope

47µF

+

-

AF­Generator

Note: (A)-(I) is refered to ADJUSTMENTS (HANDSET) (P.26)

(Flow Solder Side View)

29

Audio
Analyzer

(E)

(D)

(I), (J)

SSG

43.820MHz

RF Millivolt
Meter

Frequency
Counter

FM Deviation
Meter

50Ω

(F)

RF
Volt Meter

TXPOWERTXGND

TX VCO

DC Volt Meter(B)

RX VCO

DC Volt Meter(C)

Note: (A)-(I) is refered to ADJUSTMENTS (HANDSET) (P.26)

IC1

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

DC Power
Supply

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

10 RF SPECIFICAT ION

10.1. Base Unit

Item Value Refer to -.* Remarks
TX Frequency 30.175 MHz ± 0.1kHz ADJUSTMENTS (BASE UNIT) (C) at CH3
TX Power 8mW (3CH) ADJUSTMENTS (BASE UNIT) (D) at CH3
Line Modulation factor 2.8 kHz~3.4 kHz ADJUSTMENTS (BASE UNIT) (G)
Line Modulation factor (Max.) 4.5 kHz~8.5 kHz —
Data Modulation factor 3 kHz~7 kHz —
Line Output level 80mV ± 20mV —

*: Refer to Adjustment (P.24).

10.2. Handset

Item Value Refer to -.** Remarks
TX Frequency 39.875 MHz ± 0.1kHz ADJUSTMENTS (HANDSET) (D) at CH3
TX Power 4mW (3CH) ADJUSTMENTS (HANDSET) (E) at CH3 (Antenna

Data Modulation factor 4.0 kHz/dev~8.0 kHz/dev ADJUSTMENTS (HANDSET) (J) at CH3
MIC Modulation factor 1.5 kHz/dev~0.3 kHz/dev ADJUSTMENTS (HANDSET) (I) at CH3 (MIC terminal

SP Output level 120mV ± 30mV —

**: Refer to Adjustment (P.27).

soldering point 50Ω
Load)

2.4mV Input)

11 HOW TO CHECK THE HANDSET SPEAKER

1. Prepare the digital voltmeter, and set the selector knob to ohm meter.

2. Put the probes at the speaker terminals as shown below.

30

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

12 FREQUENCY TABLE (MHz)

BASE UNIT PORTABLE UNIT

Channel Transmit Frequency Receive Frequency Transmit Frequency Receive Frequency

1 30.0750 39.7750 39.7750 30.0750
2 30.1250 39.8250 39.8250 30.1250

3 30.1750 39.8750 39.8750 30.1750

4 30.2250 39.9250 39.9250 30.2250
5 30.2750 39.9750 39.9750 30.2750
6 30.1000 39.8000 39.8000 30.1000
7 30.1500 39.8500 39.8500 30.1500
8 30.2000 39.9000 39.9000 30.2000
9 30.2500 39.9500 39.9500 30.2500

10 30.3000 40.0000 40.0000 30.3000

31

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

13 EXPLANATIO N OF C PU DATA COMMUNICATION

13.1. STAND-BY -> TALK, TALK -> STAND-BY

*: The channel is changed if the noise interferes with the conversation.

32

13.2. Ringing

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

33

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

13.3. Changing the Channel

34

13.4. Ports for transmitting and receiving of data

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Handset:
transmitting (TX) ... 36 Pin
receiving (RX) ... 4 Pin

Base Unit:
transmitting (TX) ... 17 Pin
receiving (RX) ... 10 Pin

13.5. Waveform of DATA used for cordless transmission and reception

The DATA which is transmitted from the Handset to the Base Unit is combination of DATA 0, DATA 1, PSEUD.
The DATA which is transmitted from the Base Unit to the Handset is combination of DATA 0, DATA 1, PSEUD.

13.5.1. Handset

13.5.2. Base Unit

• • For example (one of part of data)

35

14 BLOCK DIAGRAM (BASE UNIT)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

36

H/S

DUPLEXER

DPX1

RX LOOP

TX LOOP

RF AMP

Q3,Q4, T5

ANTENNA

X1

RX VCO

L10, C26

RF AMP

Q1, T2

POWER

CONTROL

Q2

TX VCO

Q5, T6, DV1

VC1

10.7MHz 455kHz

RF FILTER

CF1, CF2

RF IC

MIX 1/2

PLL OSC

DC 5V

IC1

RF

-DATA

-CLK

-STB

EXP

COM

X2

17

14

TELEPHONE LINE

INTERFACE

·• TEL LINE

TEL
LINE
AMP

Q11, IC3

POWER SUPPLY
RESET CHARGE

5V

REGULATOR

Q18, Q19

RY1

SW

·• LINE

SEIZURE

Q10

DIODE

BRIDGE

D2, D3,

D4, D5

DC IN

12V 150mA

(AC Adaptor)

AC DOWN

DTC

Q8

TEL LINE

DC 5V

CONTROL LINE
AUDIO SIGNAL

LED

Q21, LED1

VTX RF

TX

DATA

-DATA

-CLK

-STB

RX

DATA

CPU

IC2

RESET

DTC

Q9

CHARGE

DTC

Q7

CHARGE

CONTROL

Q14, Q17

DC 12V

CHARGE

TERMINAL

KX-TC1205RUB/W/S/F BLOCK DIAGRAM (BASE UNIT)

15 BLOCK DIAGRAM (HANDSET)

37

Base

DUPLEXER

DPX1

RX LOOP

TX LOOP

RF AMP

Q5, T5

ANTENNA

X1

RX VCO

L6, C24

RF AMP

Q1, T3

POWER

CONTROL

Q4

TX VCO

Q6, T6, DV1

VC1

MIX 1/2

PLL OSC

DC 3.9V

RF FILTER

CF1, CF2

RF IC

IC1

RF

-DATA

-CLK

-STB

EXP

COM

X3

SPEAKER

REC1

MIC

MC1

DIODE

BRIDGE

Q9

DC 3.9V

CONTROL LINE
AUDIO SIGNAL

BATTERY

3.9V

LED

Q8, LED 1-4

KEY BOARD

VTX

TX

DATA

RF

-DATA

-CLK

-STB

DATA

CPU

IC2

RX

RESET

Q11

CHARGE

DTC

IC2 PING37

BUZZER

Q7, BZ1

KX-TC1205RUB/W/S/F BLOCK DIAGRAM (HANDSET)

DIODE

BRIDGE

D1

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

CHARGE

TERMINAL

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16 CIRCUIT OPERATION

16.1. Outline

Base unit consists of the following ICs as shown in BLOCK DIAGRAM.

• • CPU:IC2

− − Controlling the whole system

− − Forming/analyzing all data signals (ACK, CMD signal etc.*)

− − All interfaces (ex: LED, KEY, SP, Mic, LCD, Detector Circuit (Charge/ Power Down)

*Refer to EXPLANATION OF CPU DATA COMMUNICATION (P.32).

• • RF IC:IC1

− − PLL Oscillator

− − Detection

− − Compress/ Expander

− − first/ second mixer

− − Amplifier for transmission and reception

• • Additionally,

− − Power Supply Circuit

− − Reset Circuit

− − Charge Circuit

− − Telephone Line Interface Circuit

Handset consist of the following ICs as shown in BLOCK DIAGRAM.

• • CPU: IC2

− − All data signals (forming/analyzing ACK or CMD signal*)

− − All interfaces (ex; LED, Key, Buzzer, Detector Circuit, Charge, Battery Low)

− − RAM for keeping the data (CH Number, ID Code, etc.)

• • RF IC:IC1

− − PLL Oscillator

− − Detector

− − Compress/Expander

− − first, second mixer

− − Amplifier for transmission and reception

*Refer to EXPLANATION OF CPU DATA COMMUNICATION (P.32).

38

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.2. Power Supply Circuit

The power supply to the CPU (Digital, Analog) and RF IC from AC Adaptor (+12V) is shown in the diagram below.
The base unit power supply is DC12V. The handset´s power is supplied from 3.6V battery (Nickel-Cadmium battery) which is

installed in the handset.
Power supply for transmitter is turned on by a press of "Talk" key on the handset. During the stand-by mode, the unit stops

transmitting but receive thhe signal.
Also during on-hook condition (the handset is placed on the base unit), backup power for memory of the last dialed number is

supplied through the battery (3.6V nickel-cadmium in the handset). The memory of this unit is not backed up by the curreent
from the telephone line.

The base unit DC power supply is regulated by Q18, the CPU power is regulated by Q19. The Q8, detects AC Adaptor
powerfailure and maintains the unit cecutiry cord;

Fig. 1

39

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.3. Reset Circuit (Base Unit)

After power supply from AC adaptor, the VREG is input for making reset signal. Refer to the below waveform.

Fig. 2

Fig. 3

40

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.4. Charge Circuit

Circuit Operation:

When charging the handset on the base unit, the charge current is as follows;

DC (JK2) → L8 → D6 → L7 → CHG+(Base) → [CHG+(Handset) → L4 → Q9 → BATT(1)....Battery....BATT(2) → L5 →

CHG-(Handset)] → CHG+(Base) → L5,
In this way, the CPU on both unit detects the fact that the battery is charged.
The charge current is controlled by switching Q701 of Handset. The battery is charged in normal mode for 10 hours and then

in trickle mode.

16.5. Telephone Line Interface

Function:

• • Bell signal detection

• • ON/OFF hook and pulse dial circuit

• • Side tone circuit

Bell signal detection and OFF HOOK circuit:

In the idle mode, Q103 is open to cut the DC loop current and decrease the ring load. When ring voltage appears at the Tip (T)
and Ring (R) leads (when the telephone rings), the AC ring volltage is transferred as follows.

JK1 (3): T → L6 → R144 → IC3D (12,13 → 14) → C97 → R148 → Q20 → IC2 (24) [BELL]
JK1 (2): R → L4 → R120 → R152 →↑
When the CPU (DSP) detects a ring signal and press the TALK Key on the handset. Q6 turns on and then RY1 turns on, thus

providing an off-hook condition (active DC current flow through the circuit) and the following singal flow is for the loop current.
T → R160 → L4 → RY1 → R107 → T7 → R116 → D5 → L6 → R161 → R[OFF HOOK]

ON HOOK Circuit:

Q6 is open, RY1 disconnected as to cut the DC loop current and to cut the voice signal. The unit is consequently in an on-hook
condition.

Pulse Dial Circuit:

DSP (Relay) turns RY1 ON/OFF to make the pulse dialing via Q6.

Make/Break ratio when dialing with the Handset: 40%:60%

Side Tone Circuit:

Basically this circuit prevents the TX signal from feeding back to RX signal.
As for this unit, TX signal feed back from Q11 is canceled by the cancellor circuit of AGC.

41

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.6. Transmitter/Receiver

Base Unit and Handset are mainly consists of RF(Radio Frequency) IC and CPU.
Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.

Signal Pass :

*Refer to CDL TX/RX in Signal Route (P.44).

16.6.1. Base to Handset

Circuit Operation:

The voice signal input from the TEL LINE interface goes to RF IC as shown in
BLOCK DIAGRAM (BASE UNIT) (P.36).
In the talk mode (off-hook) condition, the telephone line voice signal passes through D2, D3, D4, D5, RY1 (Relay), R107 and

T7.
The other party´s voice signal is coupled with T7 and amplified by Q11 and led to IC3-B (OP Amplifier device).
And the signal goes through the compressor of RF IC, it is output to transmitter circuit.
The signal of the data sent to the handset is applied in the anode of the variable capacitor diode (VARICAP : DV1).
The capacitor of VARICAP is changing inaccordance with the voice signal from telephone line interface or TXDATA signal from

CPU.
Therefore, the carrier frequency which is generated by TXVCO will be changing, and Frequency modulated RF signal is

generated and amplified by RF AMP(Q3, Q4, T5).
It pass through the Duplexer DPX1 and radiated from Antenna.
The signal is transmitted from the base unit and received by the handset antenna and amplified by RF amplifier (Q1) through
DPX1 as shown in BLOCK DIAGRAM (HANDSET) (P.37). And then it is converted to 10.7 MHz and 450 KHz Intermediate

frequency by RF IC and related components.
The demodulated audio signal is output from RF IC (DET OUT) and passed through "Expander" process to reduce noise, then

voice signal amplified by "Receiver amplifier" is output to receiver (REC1).
The receiver loudness is adjustable using "LOUD" key on the handset. Q2 and Q3 control the volume. When CPU (VOL1)

becomes low, the volume becomes “MID”, while CPU (VOL 1,2) becomes low, the volume becomes "HIGH".

TX data (to Handset)

CPU (VTX) becomes low to turn on the transmission power transistor Q2, and CPU (TX-data) sends data signal. It is FM­modulated by TXVCO and driven by RF AMP, then transmitted to the handset.

42

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.6.2. Handset to Base

Circuit Operation:

The voice signal from the handset user is picked up by the microphone (MC1), voice signal passes through "Compressor"
process to reduce noise as shown in BLOCK DIAGRAM (HANDSET) (P.37). And the voice is FM-modulated by VARICAP

(DV1).
The carrier frequency is generated by TX VCO. The transmitter power transistor Q4 is turned on/off by CPU (VTX).
The carrier signal is amplified by RF AMP and sent to the handset duplexer and antenna.
The signal of 49MHz band (49.670~49.99MHz) which is input from ANT is filtered at DPX1 as shown in
BLOCK DIAGRAM (BASE UNIT) (P.36), then it is input to RF IC.
The signal input to RF IC is converted through Mixer inside of RF IC, RF filter (CF1, CF2) and Expander.
The signal is transmitted from the handset and received by the base unit antenna and amplified by RF amplifier Q1, then it is

converted to10.7 MHz and 450 KHz Intermediate by RF IC. The demodulated audio signal is output from RF IC (DET OUT) and
passed through "Expander" process to reduce noise, then voice signal is led to LINE AMP.

The signal is passed through TELEPHONE INTERFACE and Tel-line.

RX data (from Handset):

The data signal from handset (ex: Talk, ACK, COM) is also included in 49 MHz band same as the voice data. After second if
filter, the data signal is made square shape by data limiting AMP of the RF IC. RX data is output to CPU (RX Data).

16.6.3. RF signal operation/control and PLL operation (RF UNIT)

Base unit radio frequency signal received by antenna passes through duplexer (DPX1). RF signal is amplified by RF AMP.
RF signal received from RF IC is mixed with RX local frequency at Mixer to generate 10.7 MHz wide band IF. The reference

frequency is generated by X1 11.15 MHz crystal.
VC1 is the reference frequency for adjustment. The 10.7 MHz is mixed with reference and 450KHz narrow band IF is generated.

The demodulation audio signal is adjusted to the maximum at T1.
RF IC is controlled by CPU (RF_STB, DATA, CLK). The RX local frequency is generated by RXVCO.

43

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

16.7. Signal Route

Each signal route is as follows.

44

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

17 CIRCUIT OPERATION (HANDSET)

17.1. Reset Circuit (Handset)

The power of handset is supplied by battery.
Whenever the battery is recharged or inserted, the impulse at CHG+ becomes Reset signal through Q11, and sent to CPU.

Fig. 4

Fig. 5

45

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

17.2. Battery Low / Power Down Detector

Circuit Operation:

“Battery Low” and “Power Down” are detected by RF IC which check the voltage from battery. Shortly, every detected blocks
are inside of RF IC. The detected voltage is as follows;

• • Battery Low
Battery voltage : V(Batt) < 3.57V
The CPU detects this level and “Recharge battery” LED starts flashing.

• • Power Down
Battery voltage : V(Batt) < 3.3V
The output of RF IC (P-DOWN) becomes low level, then CPU stops working to keep the data (CH number, ID Code, etc.)

Fig. 6

46

18 CP U DATA (Base Unit)

18.1. IC2

KX-TC1205RUB / KX-TC1205RU W / KX-TC 1205RUS / KX- TC1205RUF

47

KX-TC1205RUB / KX-TC1205RU W / KX-TC 1205RUS / KX- TC1205RUF

19 CP U DATA (Handset)

19.1. IC2

48

20 HOW TO REPLACE FLAT

PACKAGE IC

20.1. Preparation

• • SOLDER
Sparkle Solder 115A-1, 115B-1 or Almit Solder KR-19, KR-

19RMA

• • Soldering iron
Recommended power consumption will be between 30 W

to 40 W.
Temperature of Copper Rod 662 ± 50°F (350 ± 10°C)
(An expert may handle between 60 W to 80 W iron, but

beginner might damage foil by overheating.)

• • Flux
HI115 Specific gravity 0.863.
(Original flux will be replaced daily.)

20.2. Procedure

1. Temporary fix FLAT PACKAGE IC by soldering on two
marked 2 pins.

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

20.3. Modification Procedure of
Bridge

1. Re-solder slightly on bridged portion.

2. Remove remained solder along pins employing soldering

iron as shown in below figure.

*Most important matter is accurate setting
of IC to the corresponding soldering foil.

2. Apply flux for all pins of FLAT PACKAGE IC.

3. Solder employing specified solder to direction of arrow, as
sliding the soldering iron.

49

KX-TC1205RUB / KX-TC1205RU W / KX-TC 1205R US / KX-TC1205RUF

21 CABINET AND ELECTRICAL PARTS LOCATION (BASE

UNIT)

50

KX-TC1205RUB / KX-TC1205RU W / KX-TC 1205R US / KX-TC1205RUF

22 CABINET AND ELECTRICAL PARTS LOCATION

(HANDET)

51

KX-TC1205RUB / KX-TC1205RU W / KX-TC 1205R US / KX-TC1205RUF

23 ACCESSORIES AND PACKING MATERIALS

52

24 REPLACEMEN T PARTS

LIST

Note:

1. RTL (Retention Time Limited)
The marking (RTL) indicates that the Retention Time is

limited for this item.
After the discontinuation of this assembly in production, the

item will continue to be available for a specific period of
time. The retention period of availability depends on the
type of assembly and the laws governing parts and product
retention.

At the end of this period, the assembly will no longer be
available.

2. Important safety notice
Components identified by the

characteristics important for safety. When replacing any of
these components, only use specified manufacture´s parts.

3. The S mark means the part is one of some identical parts.
For that reason, it may be different from the installed part.

4. RESISTORS & CAPACITORS
Unless otherwise specified;
All resistors are in ohms (Ω) K=1000Ω, M=1000kΩ
All capacitors are in MICRO FARADS (µF) P=µµF
*Type & Wattage of Resistor

24.1. Base Unit

24.1.1. CABINET AND ELECTRICAL

PARTS

Ref.

No.
1 PQJT10180Z CHARGE TERMINAL
2 PQHR10882Z LED LENS
3 PQGT15032Z NAME LABEL (for KX-TC1205RUB)
3 PQGT14900Z NAME LABEL (for KX-TC1205RUW)
3 PQGT14901Z NAME LABEL (for KX-TC1205RUS)
3 PQGT14902Z NAME LABEL (for KX-TC1205RUF)
4 PQQT22474Z CHARGE LABEL
5 PQBC10349Z1 PUSH BUTTON (for KX-

Part No. Part Name & Description Remarks

TC1205RUB)

mark indicates special

S

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.

5 PQBC10349Z3 PUSH BUTTON (for KX-

5 PQBC10349Z2 PUSH BUTTON (for KX-

6 PQKE10335Z1 HOOK LEVER (for KX-TC1205RUB) S
6 PQKE10335Z5 HOOK LEVER (for KX-TC1205RUW) S
6 PQKE10335Z4 HOOK LEVER (for KX-TC1205RUS) S
6 PQKE10335Z2 HOOK LEVER (for KX-TC1205RUF) S
7 PQKF10534Y1 LOWER CABINET (for KX-

7 PQKF10534Y3 LOWER CABINET (for KX-

7 PQKF10534Y2 LOWER CABINET (for KX-

8 PQKM10509W1 UPPER CABINET (for KX-

8 PQKM10509W4 UPPER CABINET (for KX-

8 PQKM10509W3 UPPER CABINET (for KX-

8 PQKM10509W2 UPPER CABINET (for KX-

9 PQSA10104Y ANTENNA
10 XXLABALACE1 HOOK LABEL (for KX-TC1205RUB)
10 XXLASILUER1 HOOK LABEL (for KX-

Part No. Part Name & Description Remarks

TC1205RUW)

TC1205RUS/KX-TC1205RUF)

TC1205RUB/KX-TC1205RUF)

TC1205RUW)

TC1205RUS)

TC1205RUB)

TC1205RUW)

TC1205RUS)

TC1205RUF)

TC1205RUW/KX-TC1205RUS/KX­TC1205RUF)

24.1.2. MAIN P.C.BOARD PARTS

Ref.

No.

PCB1 PQWPC1205RUH MAIN P.C.BOARD ASS´Y (RTL)

IC1 SA133122409 IC
IC2 SA138740577 IC
IC3 SA110032403 IC
IC4 AN6183S IC

Q1 BB230024104 TRANSISTOR(SI)
Q2 SB010390608 TRANSISTOR(SI)
Q3 SB110390405 TRANSISTOR(SI)
Q4 SB110390405 TRANSISTOR(SI)
Q5 SB110390405 TRANSISTOR(SI)
Q6 SB110390405 TRANSISTOR(SI)
Q7 SB110390405 TRANSISTOR(SI)
Q8 SB110390405 TRANSISTOR(SI)
Q9 SB110390405 TRANSISTOR(SI)
Q10 BB010009408 TRANSISTOR(SI)
Q11 SB110390405 TRANSISTOR(SI)
Q14 SB010390608 TRANSISTOR(SI)
Q16 SB110390405 TRANSISTOR(SI)
Q17 SB110390405 TRANSISTOR(SI)
Q18 BB1G0390403 TRANSISTOR(SI)
Q19 BB1G0390403 TRANSISTOR(SI)
Q20 SB110390405 TRANSISTOR(SI)
Q21 SB110390405 TRANSISTOR(SI)

D1 SC15L414808 DIODE(SI)
D2 BC2G0400400 DIODE(SI)
D3 BC2G0400400 DIODE(SI)
D4 BC2G0400400 DIODE(SI)
D5 BC2G0400400 DIODE(SI)
D6 BC2G0400400 DIODE(SI)
D9 SC15L414808 DIODE(SI)
D10 SC15L414808 DIODE(SI)
DV1 BC6K0025101 DIODE(SI)
ZD1 BC050474801 DIODE(SI)
ZD2 BC050474801 DIODE(SI)
ZD3 SC4555C4V71 DIODE(SI)
ZD5 SC4555C4V71 DIODE(SI)
ZD6 BC2G0400400 DIODE(SI)
ZD7 BC4579C2702 DIODE(SI)
ZD8 BC4579C5V65 DIODE(SI)
ZD10 SC4555C1506 DIODE(SI)

Part No. Part Name & Description Remarks

(ICS)

(TRANSISTORS)

(DIODES)

S

S

S

S

S

S

S

S

S

53

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.
ZD11 SV110201203 DIODE(SI)
ZNR1 VA107D271K1 DIODE(SI)

L1 PQLQZK2R2J COIL
L4 PQLQZK120J COIL
L5 PQLQZK120J COIL
L6 PQLQZK120J COIL
L7 PQLQZK120J COIL
L10 PQLQZK120J COIL
L12 SH4Y0750K46 COIL

JK1 DC72P120018 JACK/SOCKET
JK2 DC71P120023 JACK/SOCKET

CF1 BDFL107MA53 CERAMIC FILTER
CF2 BDFL0455E02 CERAMIC FILTER
DPX1 BDFL0083004 CERAMIC FILTER

X1 BD1R1024504 CRYSTAL OSCILLATOR
X2 BDRR0800005 CRYSTAL OSCILLATOR

T1 CLIP1200053 TRANSFORMER
T2 CLIP1200100 TRANSFORMER
T5 CLIP1200096 TRANSFORMER
T6 CLIP1200142 TRANSFORMER
T7 DG0P1200035 TRANSFORMER

D7 PQVDDSP272M VARISTOR
IC5 PQVIPC817K PHOTO ELECTRIC TRANSDUCER
LED1 SC5E0192115 LED
RY1 DCR000105H7 RELAY
SW1 DETP1200017 PUSH SWITCH
VC1 CR00020RRT5 TRIMMER CAPACITOR

R1 ERJ3GEYJ470 47
R2 ERJ3GEYJ330 33
R3 ERJ3GEYJ153 15k
R4 ERJ3GEYJ822 8.2k
R5 ERJ3GEYJ103 10k
R6 ERJ3GEYJ103 10k
R7 ERJ3GEYJ334 330k
R8 ERJ3GEYJ103 10k
R10 ERJ3GEYJ393 39k
R11 ERJ3GEYJ102 1k
R12 ERJ3GEYJ101 100
R13 ERJ3GEYJ623 62k
R14 ERJ3GEYJ103 10k
R15 ERJ3GEYJ562 5.6k
R16 ERJ3GEYJ153 15k
R17 ERJ3GEY0R00 0
R18 ERJ3GEYJ472 4.7k
R19 ERJ3GEYJ124 120k
R20 ERJ3GEYJ475 4.7M
R21 ERJ3GEYJ473 47k
R22 ERJ3GEYJ472 4.7k
R23 ERJ3GEYJ563 56k
R24 ERJ3GEYJ103 10k
R25 ERJ3GEYJ683 68k
R26 ERJ3GEYJ473 47k
R27 PQ4R10XJ560 56 S
R29 ERJ3GEY0R00 0
R30 ERJ3GEYJ104 100k
R31 ERJ3GEYJ473 47k
R32 ERJ3GEYJ105 1M
R33 ERJ3GEY0R00 0
R35 ERJ3GEYJ101 100
R36 ERJ3GEYJ224 220k
R37 ERJ3GEYJ101 100
R38 ERJ3GEYJ823 82k
R40 ERJ3GEYJ223 22k
R41 ERJ3GEYJ473 47k
R42 ERJ3GEYJ103 10k
R43 ERJ3GEYJ393 39k

Part No. Part Name & Description Remarks

(COILS)

(CONNRCTORS)

(CERAMIC FILTERS)

(CRYSTAL OSCILLATORS)

(TRANSFORMERS)

(OTHERS)

(RESISTORS)

Ref.

No.
R44 ERJ3GEYJ104 100k
R45 ERJ3GEYJ334 330k
R46 ERJ3GEYJ222 2.2k
R48 ERJ3GEYJ223 22k
R49 ERJ3GEYJ473 47k
R50 ERJ3GEYJ822 8.2k
R51 ERJ3GEYJ182 1.8k
R52 ERJ3GEYJ225 2.2M
R53 ERJ3GEYJ153 15k
R55 ERJ3GEYJ681 680
R56 ERJ3GEYJ222 2.2k
R57 ERJ3GEYJ224 220k
R58 ERJ3GEYJ511 510
R59 ERJ3GEYJ104 100k
R60 ERJ3GEYJ223 22k
R61 ERJ3GEYJ224 220k
R63 ERJ3GEYJ104 100k
R64 ERDS2TJ103 10k
R68 ERJ3GEYJ104 100k
R74 ERJ3GEY0R00 0
R75 ERJ3GEYJ103 10k
R77 ERJ3GEYJ203 20k
R78 ERJ3GEYJ393 39k
R79 ERJ3GEYJ823 82k
R80 ERJ3GEYJ222 2.2k
R81 ERJ3GEYJ164 160k
R82 ERJ3GEYJ103 10k
R83 ERJ3GEYJ103 10k
R84 ERJ3GEYJ103 10k
R85 ERJ3GEYJ103 10k
R86 ERJ3GEYJ473 47k
R87 ERJ3GEYJ102 1k
R88 ERJ3GEYJ103 10k
R89 ERJ3GEYJ103 10k
R90 ERJ3GEYJ304 300k
R91 ERJ3GEYJ154 150k
R92 ERJ3GEYJ103 10k
R93 ERJ3GEYJ104 100k
R95 ERJ3GEYJ392 3.9k
R96 ERJ3GEYJ274 270k
R97 ERJ3GEYJ822 8.2k
R98 ERJ3GEYJ123 12k
R99 ERJ3GEYJ823 82k
R100 ERJ3GEYJ104 100k
R103 ERJ3GEYJ223 22k
R104 ERJ3GEYJ472 4.7k
R105 ERJ3GEYJ472 4.7k
R106 ERDS2TJ220 22
R107 CQ63110RJ21 110
R108 ERJ3GEYJ472 4.7k
R109 ERJ3GEYJ334 330k
R110 ERJ3GEYJ104 100k
R111 ERJ3GEYJ471 470
R112 ERJ3GEYJ102 1k
R113 ERDST1TJ330 33
R114 ERJ3GEYJ223 22k
R115 ERJ3GEYJ563 56k
R116 ERJ3GEY0R00 0
R117 ERJ3GEYJ394 390k
R118 ERDS1TJ150 15
R119 ERJ3GEYJ823 82k
R120 ERJ3GEY0R00 0
R122 ERJ3GEYJ132 1.3k
R123 ERJ3GEYJ153 15k
R126 ERJ3GEYJ621 620
R129 ERJ3GEYJ682 6.8k
R131 ERJ3GEYJ104 100k
R132 ERJ3GEYJ222 2.2k
R133 ERJ3GEYJ820 82
R134 ERJ3GEY0R00 0
R135 ERJ3GEYJ152 1.5k
R139 ERJ3GEYJ106 10M
R141 ERJ3GEYJ512 5.1k

Part No. Part Name & Description Remarks

54

Ref.

No.
R142 ERDS2TJ220 22
R143 ERJ3GEYJ514 510k
R144 ERDS2TJ206 20M
R145 ERJ3GEYJ102 1k
R146 ERJ3GEYJ153 15k
R148 ERJ3GEYJ103 10k
R149 ERJ3GEYJ182 1.8k
R150 ERJ3GEYJ514 510k
R151 ERDST1TJ682 6.8k
R152 ERDS2TJ206 20M
R153 ERJ3GEYJ105 1M
R154 ERJ3GEY0R00 0
R155 ERJ3GEYJ470 47
R156 ERJ3GEYJ470 47
R159 ERJ3GEYJ104 100k
R160 PQ4R10XJ000 0 S
R161 PQ4R10XJ000 0 S
R166 ERJ3GEYJ470 47
R167 ERJ3GEYJ103 10k
R170 ERJ3GEYJ102 1k
R171 ERJ3GEYJ102 1k
R172 ERDS2TJ223 22k
R173 ERDS2TJ102 1k
R174 ERDS2TJ102 1k
R176 ERJ3GEY0R00 0
R180 ERJ3GEYJ563 56k
R181 ERJ3GEYJ330 33
R186 ERJ3GEYJ472 4.7k
R187 ERJ3GEYJ273 27k
R188 ERJ3GEYJ103 10k
R189 ERJ3GEYJ223 22k
R190 ERJ3GEYJ103 10k
R191 ERJ3GEYJ683 68k
R192 ERJ3GEYJ124 120k
R193 ERJ3GEYJ104 100k
R194 ERJ3GEY0R00 0

C1 ECEA1EK470 47 S
C2 ECUV1H473MDV 0.047 S
C4 ECUV1H103KBV 0.01
C6 ECUV1C104ZFV 0.1
C7 ECUV1H102KBV 0.001
C8 ECUV1C104ZFV 0.1
C9 ECUV1H471JCV 470p
C10 ECUV1H471JCV 470p
C11 ECUV1H473MDV 0.047 S
C12 ECUV1H103KBV 0.01 S
C15 ECEA1HU2R2 2.2
C16 ECUV1H270JCV 27p
C17 ECEA1AKA101 100
C18 ECUV1C473KBV 0.047
C19 ECUV1H102KBV 0.001
C20 ECEA1HKA2R2 2.2
C22 ECUV1H103KBV 0.01 S
C23 ECUV1H103KBV 0.01 S
C24 ECUV1E223ZFV 0.022
C25 ECUV1H822KBV 0.0082
C26 ECUV1H070DCV 7p S
C27 ECUV1H103KBV 0.01
C28 ECUV1C104KBV 0.1
C29 ECUV1C104KBV 0.1
C30 ECEA1HKA2R2 2.2
C31 ECUV1H103KBV 0.01
C32 ECEA1HU2R2 2.2
C33 ECUV1H101JCV 100p
C34 ECUV1H471JCV 470p
C35 ECUV1H180JCV 18p
C36 ECUV1H101JCV 100p
C37 ECUV1H151JCV 150p
C38 ECEA1HKS010 1 S
C39 ECUV1H103KBV 0.01 S
C40 ECUV1H270JCV 27p
C41 ECEA1EK470 47 S

Part No. Part Name & Description Remarks

(CAPACITORS)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.
C42 ECEA1HU2R2 2.2
C43 ECUV1C104ZFV 0.1
C44 ECUV1A105ZFV 1
C45 ECUV1H682KBV 0.0068
C46 ECUV1H102KBV 0.001
C47 ECUV1H103KBV 0.01 S
C48 ECUV1H223KBV 0.022 S
C49 ECUV1H103KBV 0.01 S
C50 ECEA1HU220 22 S
C51 ECUV1H103KBV 0.01 S
C52 ECUV1H223KBV 0.022 S
C53 ECUV1H120JCV 12p
C54 ECUV1H020CCV 2p
C55 ECUV1H103KBV 0.01 S
C56 ECUV1H180JCV 18p
C57 ECUV1H390JCV 39p
C58 ECUV1H682KBV 0.0068
C59 ECUV1H390JCV 39p
C60 ECUV1H180JCV 18p
C61 ECUV1C104ZFV 0.1
C62 ECUV1H390JCV 39p
C63 ECUV1H103KBV 0.01 S
C64 ECUV1C104ZFV 0.1
C65 ECUV1H220JCV 22p
C66 ECEA1AU101 100
C67 ECUV1H220JCV 22p
C68 ECEA1HKAR47 0.47
C69 ECUV1H271JCV 270p
C70 ECUV1H223KBV 0.022 S
C71 ECUV1C104ZFV 0.1
C72 ECUV1H223KBV 0.022 S
C73 ECUV1C104ZFV 0.1
C74 ECUV1C104ZFV 0.1
C75 ECUV1H223KBV 0.022 S
C76 CATZ681KC68 680p
C77 ECUV1H151JCV 150p
C78 ECEA1AU471 470
C79 ECUV1C104ZFV 0.1
C80 CATZ681KC68 680p
C81 CJB21004K00 1
C82 ECUV1C104ZFV 0.1
C85 ECUV1C683KBV 0.068
C86 ECUV1H103KBV 0.01 S
C88 ECUV1A105ZFV 1
C90 ECUV1C224KBV 0.22
C92 ECUV1C104KBV 0.1
C93 ECUV1H562KBV 0.0056
C94 ECEA1CK101 100 S
C95 CB114714205 470
C96 ECUV1H103KBV 0.01 S
C97 ECEA1HKA4R7 4.7
C98 ECEA1EU221 220
C99 ECUV1H103KBV 0.01 S
C100 CJB21004K00 1
C101 ECUV1H562KBV 0.0056
C102 ECEA1EU221 220
C103 ECEA1AU470 47
C104 ECUV1H390JCV 39p
C104 ECFD1C104KD 104
C105 ECEA1CKA100 10
C106 ECUV1A105ZFV 1
C107 ECUV1C104ZFV 0.1
C108 ECUV1C104KBV 0.1
C109 ECUV1H682KBV 0.0068
C110 ECUV1H470JCV 47p
C111 ECUV1H103KBV 0.01 S
C121 ECUV1H103KBV 0.01 S
C123 ECUV1C474ZFV 0.47
C124 ECUV1C224KBV 0.22
C125 ECUV1H100DCV 10p S
C126 ECUV1C224KBV 0.22
C127 ECEA1EK470 47 S
C128 ECUV1C104KBV 0.1

Part No. Part Name & Description Remarks

55

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.
C129 ECUV1C104ZFV 0.1
C130 ECEA1AKA101 100
C131 ECUV1C104KBV 0.1
C132 ECUV1C104KBV 0.1
C133 ECUV1H390JCV 39p

Part No. Part Name & Description Remarks

24.2. Handset

24.2.1. CABINET AND ELECTRICAL
PARTS

Ref.

No.
101 PQJT10182Z CHARGE TERMINAL
102 PQGT15033Z NAME LABEL (for KX-TC1205RUB)
102 PQGT14903Z NAME LABEL (for KX-TC1205RUW)
102 PQGT14904Z NAME LABEL (for KX-TC1205RUS)
102 PQGT14905Z NAME LABEL (for KX-TC1205RUF)
103 PQKF10535Y1 REAR CABINET (for KX-

103 PQKF10535Y5 REAR CABINET (for KX-

103 PQKF10535Y4 REAR CABINET (for KX-

103 PQKF10535Y2 REAR CABINET (for KX-

104 PQKK10124Z1 BATTERY COVER (for KX-

104 PQKK10124Z5 BATTERY COVER (for KX-

104 PQKK10124Z4 BATTERY COVER (for KX-

104 PQKK10124Z2 BATTERY COVER (for KX-

105 PQKM10510W1 FRONT CABINET (for KX-

105 PQKM10510W5 FRONT CABINET (for KX-

105 PQKM10510W4 FRONT CABINET (for KX-

105 PQKM10510W2 FRONT CABINET (for KX-

106 PQSA10084U ANTENNA (for KX-TC1205RUB/KX-

106 PQSA10084V ANTENNA (for KX-TC1205RUW/KX-

107 PQSX10191Z KEYBOARD SWITCH (for KX-

107 PQSX10191V KEYBOARD SWITCH (for KX-

107 PQSX10191W KEYBOARD SWITCH (for KX-

108 PQXA36ASVC BATTERY
109 FH1T1200011 CUSHION, URETHANE FORM
110 CG2P1200012 SPEAKER
111 FE4T1200019 SP NET
112 FH2T1200012 BUZZER SHEET
113 PQHR10896Z LIGHT PIPE
114 FE4T1200027 MIC NET

24.2.2. MAIN P.C.BOARD PARTS

Ref.

No.
PCB100 PQWPC1205RUR MAIN P.C.BOARD ASS´Y (RTL)

IC1 SA133122409 IC
IC2 SA138780731 IC

Q1 SB110390405 TRANSISTOR(SI)
Q2 SB110390405 TRANSISTOR(SI)
Q3 SB110390405 TRANSISTOR(SI)
Q4 SB010390608 TRANSISTOR(SI)
Q5 SB110390405 TRANSISTOR(SI)
Q6 SB110390405 TRANSISTOR(SI)

Part No. Part Name & Description Remarks

TC1205RUB)

TC1205RUW)

TC1205RUS)

TC1205RUF)

TC1205RUB)

TC1205RUW)

TC1205RUS)

TC1205RUF)

TC1205RUB)

TC1205RUW)

TC1205RUS)

TC1205RUF)

TC1205RUF)

TC1205RUS)

TC1205RUB/KX-TC1205RUF)

TC1205RUW)

TC1205RUS)

Part No. Part Name & Description Remarks

(ICS)

(TRANSISTORS)

Ref.

No.
Q7 SB010390608 TRANSISTOR(SI)
Q8 SB110390405 TRANSISTOR(SI)
Q9 SB110390405 TRANSISTOR(SI)
Q11 SB110390405 TRANSISTOR(SI)

D1 SC15L414808 DIODE(SI)
D2 SC15L414808 DIODE(SI)
D3 SC15L414808 DIODE(SI)
DV1 BC6K0025101 DIODE(SI)
ZD1 BC4579C1005 DIODE(SI)
ZD3 SC455C5V601 DIODE(SI)

LED1 SC5E0192115 LED
LED2 SC5E0192115 LED
LED3 SC5E0192115 LED
LED4 SC5E0192115 LED
LED5 SC5E0192115 LED
LED6 SC5E0192123 LED

S

S

S

S

S

S

S

S

S

S

S

S

L1 PQLQZKR68J COIL
L2 PQLQZM120K COIL
L3 PQLQZM120K COIL
L4 PQLQZK120J COIL
L5 PQLQZK120J COIL
L6 PQLQZK1R8J COIL
L7 SH590121N75 COIL

CF1 BDFL107MA53 CERAMIC FILTER
CF2 BDFL0455E02 CERAMIC FILTER
DPX1 BDFL0083012 CERAMIC FILTER

X1 BD5R1024501 CRYSTAL OSCILLATOR
X2 BD8R3276805 CRYSTAL OSCILLATOR
X3 BD1R0399202 CRYSTAL OSCILLATOR

T1 CLIP1200053 TRANSFORMER
T3 CLIP1200070 TRANSFORMER
T5 CLIP1200061 TRANSFORMER
T6 CLIP1200088 TRANSFORMER

E101 CK15HC12G10 RINGER
E102 CGAP1200019 MICROPHONE
E103 PQJT10183Z CHARGE CONTACT
BATT1 PQJP2D13Z CONNECTOR
VC1 CR00020RRT5 TRIMMER CAPACITOR

R1 ERJ3GEYJ331 330
R2 ERJ3GEYJ153 15k
R3 ERJ3GEYJ682 6.8k
R5 ERJ3GEYJ103 10k
R6 ERJ3GEYJ103 10k
R8 ERJ3GEYJ224 220k
R9 ERJ3GEYJ823 82k
R10 ERJ3GEYJ823 82k
R11 ERJ3GEYJ562 5.6k
R12 ERJ3GEYJ224 220k
R13 ERJ3GEYJ123 12k
R14 ERJ3GEYJ153 15k
R15 ERJ3GEY0R00 0
R16 ERJ3GEYJ103 10k
R17 ERJ3GEYJ512 5.1k
R18 ERJ3GEYJ103 10k
R19 ERJ3GEYJ472 4.7k
R20 ERJ3GEYJ182 1.8k
R21 ERJ3GEYJ823 82k
R22 ERJ3GEYJ472 4.7k
R23 ERJ3GEYJ473 47k
R24 ERJ3GEYJ472 4.7k
R25 ERJ3GEYJ563 56k
R26 ERJ3GEYJ103 10k
R28 ERJ3GEYJ124 120k
R29 ERJ3GEYJ682 6.8k
R30 ERJ3GEY0R00 0

Part No. Part Name & Description Remarks

(DIODES)

(LEDS)

(COILS)

(CERAMIC FILTERS)

(CRYSTAL OSCILLATORS)

(TRANSFORMERS)

(OTHERS)

(RESISTORS)

56

Ref.

No.
R34 ERJ3GEYJ224 220k
R35 ERJ3GEYJ473 47k
R36 ERJ3GEYJ202 2k
R37 ERJ3GEYJ102 1k
R38 ERJ3GEY0R00 0
R39 ERJ3GEYJ224 220k
R40 ERJ3GEYJ330 33
R41 ERJ3GEYJ683 68k
R42 ERJ3GEYJ223 22k
R43 ERJ3GEYJ104 100k
R44 ERJ3GEYJ393 39k
R45 ERJ3GEYJ104 100k
R46 ERJ3GEYJ434 430k
R47 ERJ3GEYJ222 2.2k
R48 ERJ3GEYJ223 22k
R49 ERJ3GEYJ473 47k
R50 ERJ3GEYJ822 8.2k
R51 ERJ3GEYJ272 2.7k
R52 ERJ3GEYJ681 680
R53 ERJ3GEYJ820 82
R54 ERJ3GEYJ104 100k
R55 ERJ3GEYJ390 39
R56 ERJ3GEYJ222 2.2k
R57 ERJ3GEYJ332 3.3k
R58 ERJ3GEYJ470 47
R59 ERJ3GEYJ222 2.2k
R60 ERJ3GEYJ222 2.2k
R61 ERJ3GEYJ331 330
R62 ERJ3GEYJ222 2.2k
R63 ERJ3GEYJ103 10k
R64 ERJ3GEYJ103 10k
R65 ERJ3GEYJ331 330
R66 ERJ3GEYJ222 2.2k
R67 ERJ3GEYJ222 2.2k
R68 ERJ3GEYJ103 10k
R69 ERJ3GEYJ222 2.2k
R70 ERJ3GEYJ222 2.2k
R72 ERJ3GEYJ105 1M
R74 ERJ3GEYJ104 100k
R75 ERJ3GEYJ104 100k
R76 ERJ3GEYJ104 100k
R77 ERJ3GEYJ103 10k
R78 ERJ3GEYJ104 100k
R79 ERJ3GEYJ105 1M
R81 ERJ3GEYJ105 1M
R82 ERJ3GEY0R00 0
R83 ERJ3GEY0R00 0
R84 ERJ3GEYJ105 1M
R85 ERJ3GEYJ102 1k
R86 ERJ3GEYJ104 100k
R87 ERJ3GEYJ104 100k
R91 ERJ3GEY0R00 0
R93 ERJ3GEYJ103 10k
R94 ERJ3GEYJ334 330k
R95 ERJ3GEYJ393 39k
R96 ERJ3GEY0R00 0
R97 ERJ3GEYJ104 100k
R98 ERJ3GEYJ475 4.7M
R99 ERJ3GEYJ472 4.7k
R101 ERJ3GEY0R00 0
R103 ERJ3GEYJ105 1M
R105 ERJ3GEYJ103 10k
R106 ERJ3GEYJ151 150
R107 ERJ3GEYJ222 2.2k
R108 ERJ3GEYJ102 1k
R109 ERJ3GEYJ102 1k
R110 ERJ3GEYJ102 1k
R111 ERJ3GEYJ102 1k
R112 ERJ3GEYJ102 1k

C1 ECEA1EK470 47 S
C2 ECUV1H473MDV 0.047 S
C3 ECUV1H390JCV 39p

Part No. Part Name & Description Remarks

(CAPACITORS)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.
C4 ECUV1H270JCV 27p
C5 ECUV1C104ZFV 0.1
C6 ECUV1H102KBV 0.001
C7 ECUV1C104ZFV 0.1
C8 ECUV1H473MDV 0.047 S
C9 ECUV1H103KBV 0.01
C12 ECEA1HKA2R2 2.2
C13 ECUV1H270JCV 27p
C14 ECUV1H103KBV 0.01
C15 ECEA1CKA100 10
C16 ECUV1C473KBV 0.047
C17 ECUV1H102KBV 0.001
C18 ECEA1HKA2R2 2.2
C21 ECUV1H223KBV 0.022 S
C22 ECUV1H390JCV 39p
C23 ECUV1H102KBV 0.001
C24 ECUV1H220JCV 22p
C26 ECUV1H103KBV 0.01
C27 ECUV1C104KBV 0.1
C28 ECUV1H682KBV 0.0068
C29 ECEA1HKA2R2 2.2
C30 ECUV1C104KBV 0.1
C31 ECUV1H103KBV 0.01
C32 ECUV1C104KBV 0.1
C33 ECUV1C104KBV 0.1
C34 ECUV1H101JCV 100p
C35 ECUV1H681JCV 680p
C36 ECUV1H180JCV 18p
C37 ECEA1HKA010E 1
C38 ECUV1H101JCV 100p
C39 ECUV1H151JCV 150p
C40 ECUV1H103KBV 0.01 S
C41 ECUV1H220JCV 22p
C42 ECEA1EK470 47 S
C43 ECEA1HKA2R2 2.2
C44 ECUV1C105ZFV 1
C45 ECUV1C683KBV 0.068
C47 ECUV1H682KBV 0.0068
C48 ECEA1EK470 47 S
C49 ECUV1H223KBV 0.022 S
C50 ECUV1H103KBV 0.01 S
C51 ECEA1CKA100 10
C52 ECUV1H103KBV 0.01 S
C53 ECUV1H223KBV 0.022 S
C54 ECUV1H100DCV 10p S
C55 ECUV1H103KBV 0.01 S
C56 ECUV1H010CCV 1p
C57 ECUV1H150JCV 15p
C58 ECUV1H103KBV 0.01
C59 ECUV1H270JCV 27p
C60 ECUV1H270JCV 27p
C61 ECUV1C104ZFV 0.1
C62 ECUV1H560JCV 56p
C63 ECEA1CK101 100 S
C64 ECUV1H103KBV 0.01 S
C65 ECUV1H150JCV 15p
C66 ECUV1H150JCV 15p
C69 ECUV1C104ZFV 0.1
C70 ECUV1H330JCV 33p
C71 ECUV1H330JCV 33p
C72 ECUV1C104ZFV 0.1
C73 ECUV1C104ZFV 0.1
C74 ECUV1H473MDV 0.047 S
C75 ECUV1H103KBV 0.01
C76 ECUV1H471JCV 470p
C77 ECUV1H471JCV 470p
C78 ECUV1H103KBV 0.01
C79 ECUV1H103KBV 0.01
C80 ECUV1H103KBV 0.01
C84 ECUV1C104ZFV 0.1
C85 ECUV1C105ZFV 1
C86 ECUV1C104ZFV 0.1
C88 ECUV1C104ZFV 0.1

Part No. Part Name & Description Remarks

57

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

Ref.

No.

R102 ECUV1H333KBV 0.033 S

Part No. Part Name & Description Remarks

24.3. ACCESSORIES AND PACKING
MATERIALS

Ref.

No.
A1 PQJA10075Z TEL CORD
A2 PQLV16CEZ AC ADAPTOR
A3 PQQX13178Z INSTRUCTION BOOK
A4 PQQW12509Z LEAFLET
P1 PQPP10090Z POLY BAG (for Base Unit)
P2 PQPP10091Z POLY BAG (for Handset)
P3 PQPP10092Z POLY BAG
P4 PQPK13522Z GIFT BOX

Part No. Part Name & Description Remarks

58

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

25 FOR SCHEMATIC DIAGRAM

25.1. Base Unit (SCHEMATIC DIAGRAM (Base Unit))

1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

Important Safety Notice:

Components identified by
any of these components, use only the manufacturer´s specified parts.

25.2. Handset (SCHEMATIC DIAGRAM (Handset))

1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

mark have special characteristics important for safety. When replacing

59

26 SCHEMATIC DIAGRAM (Base Unit)

26.1. Base Unit

VREG

R57

60

C106
105
C0603

EXPO

COMP

CHARGE--

TP

13V to 5V
While charging

ZD10

15V/0.5W

ZD7.5

CHARGE+

D7

2700V

JK1

CHAG-CNTL

PIN2

R131

R132

100K

2K2

R0603

R0603

ADAPTOR
120V AC
12VDC
200mA

JK2
JACK DC

Q7
SOT-23

TP

C63

220K

103

R0603

C0603

R76
NA

R0603

R97
8K2
R0603

C73
104
C0603

C107
104
C0603

L5
12uH
L10

L7
12uH
L10

R118

150 1/2W

R12.5

Q14
SOT-23

Q17
SOT-23

D6
D10B

L8
JUMPER

+

L10

L9
JUMPER
L10

470UF\25V

TP

TP

R58
510
R0603

LED1
CHARGE
LED

19-21VGC/
TR8 GREEN

R100
100K
R0603

ZD4
NA
ZD7.5

R125
NA
R0603

R142
22 1/4W
R10

C95
EC10\5

TP

SW1
PAGE
SW2P

Q8
SOT-23

R108
4K7

R0603

AGC
CIRCUIT

AGC1

AGC2

R59
100K
R0603

R64
10K 1/4W
R0603

TX DATA

R91 150KR0603

R98
12K

R0603

TP

TO-92\EBC

R111KR0603

+

C98
220uF
EC5\5

RF-CLK

R171

IC3B

SIP14

0V

C82
104

C0603

+

C105
100UF/10V
EC5/5

Q19

R0603

5

NA
C0603

Q13
NA
SOT-23

Q16
SOT-23

+

R60
22K
R0603

7

C84

1K

VB

+12V

-

6

C0603

C88
105
C0603

R145
1K
R0603

C99
103
C0603

TP

+5V

C0603

PMUTE

411

C79
104

C64
104

Q21

SOT-23

R92
10K
R0603

R0603

R121

NA
R0603

R157

NA
R0603

A

R134
R0603

VB

TO-92\EBC

0

Q18

VTX

R114
22K

R166
R0603

R167
10K
R0603

RINGDET

CR-DET

47

+

C102
220UF/25V
EC10/5

ZD8
ZD7.5

VCPU

C68

0.47uF/50V
EC5\5

R109
330K
R0603

VREG

+5V

C96
103
R0603

CHAG-CNTL

R87 1K
R0603

+

VREG

C77
150P
C0603

R159
100K

R0603

R80 2K2 R0603

R82 10K
R84 10K
R89 10K

R99
82K
R0603

TP

+

C94
100UF\10V
EC8\5

C89
NA
C0603

R158
NA
R0603

VREG

+

C78

470UF/10V

EC10/5

R115
56K

R0603

R141

RING DET

R0603
R0603
R0603

5K1
R0603

C75
223
C0603

Q20
SOT-23

ZD3
4V7
D\362

ZD5
4V7
D\362

Q11
SOT-23

R133
82
R0603

R122

1K3
R0603

+5V

VCC
RESET
CHG LD

PAGE
HOOK
VTX
CNDET
CHG D
TX D
P MUTE
CLOCK

Q9
SOT-23

R106
22 1/4W
R10

C83
NA
C0603

C92

104
C0603

R146
15K
R0603

TP

C124
224
C0603

KX-TC1205RUB / KX-TC1205RU W / KX-TC1205RUS / KX-TC1205RUF

R153
1M
R0603

7.952
XTAL\10

R10

C91

R144
20M 1/4W
R10

20M 1/4W

X2

R112
1K
R0603

+

1Vp-p

100uF/10V

EC10/5

C67
22P
C0603

R83 10K

RF-STB

R88 10K

R0603

D1
D\362

PMUTE

LIMITED CURRENT

ZD6
27V
ZD7.5

ZD7
27V
ZD7.5

R10

C66

+

R0603

1

R104
4K7
R0603

D2
D10B

D4
D10B

R127
NA
R10

RING
IMPEDENCE

R151
6K8/1W
R12.5

0V

4 11

+12V

D3
D10B

D5
D10B

R189

22K

R0603

MPC25\22

R68
100K
R0603

-

2

+

3

IC3A

SIP14

1U/250V

C100

300K
R0603

C69
270P
C0603

R128
NA
R10

C120
NA
C0603

C0603

R90

C121
103

VREG

C74
104
C0603

R0603

R120

R75 10K R0603
R77 20K R0603
R78 39K R0603
R79 82K R0603
R81 160K R0603

C72
223
C0603

R103
22K
R0603

L4
12uH
L10

C76

IC3 PIN7

C86
103
C0603

0V

9

10

R139
10M
R0603

VCPU

R96
270K
R0603

VREG

680P 500V
CC6\5

C80
680P 500V
CC6\5

R117
390K

R0603

-

+

IC3C

411

SIP14

+12V

R147

R0603

Q6
SOT-23

ZD9
NA

ZD7.5
R86
47K
R0603

C70
223
C0603

C111

R102

103

NA

R0603

R0603

FS1
JUMP 5MM
FUSE\12.5

R160
0
R0805

R161
0
R0805

L6
12uH
L10

R178
NA
R10

C126

D10

224

D\362

C0603

8

R186
R0603

4K7

D9

D\362

0

TP

TP

R179
NA
R0603

R0603
27K
R187

+

LINE JACK 4C

R162
NA
R0805

AGC1

C127
47UF

R163
NA
R0805

JK1

1
2
3
4

LINE\JK1

AGC2

R188
10K
R0603

L11
JUMP
4MM

RX DATA

RF-DATA

R95
3K9

R0603

R180
56K
R0603

ZNR1
270V

ZNR\7K

0

R135

0603

1.5K
C132
104

C0603

RING SELECT

AGC CIRCUIT

RX
TX

8MHz

C104
104
C0603

28

VDD

27

RST

26

P10

25

P11

24

P12

23

P13

22

P14

21

P15

20

P16

19

P17

18

P72

17

P73

16

P74

15

P75

C71
104
C0603

R105

4.7K
R0603

R181
330
R0603

C123
474
C0603

C85
683

C0603

R126
620
R0603

C90
224
C0603

R148
10K
R0603

IC2

DIP28

R0603

R111
470

XOUT
TEST

6

4

R129
6K8
R0603

XIN

P67
P66
P65
P64
P63
P62
P61
P60
P77
P76
VSS

5

R0603

0V

LB-0627

R0603

R123

15K

R149
1K8
R0603

T7

R143
510K
R0603

R119
82K

1
2
3
4
5
6
7
8
9
10
11
12
13
14

R61
220K

R0603

OSCO
OSCI
TEST
POW F
DTMF4
DTMF3
DTMF2
DTMF1
DTMF0
RXDATA
COUT1
STROBE
DATA

JUMP
4MM

1

2

3

+

4U7/50V
EC5\5

L3

C97

ZD1
22V/1W
ZD7.5

R62
NA
R0603

R107
110 2W
R15

C81 1U/250V

R113
33/1W
R12.5

R137
4K7
R0603

C93
562
C0603

14

IC3D

SIP14

R63
100K
R0603

R93
100K
R0603

R172

22K L10

ZD2
22V/1W
ZD7.5

MPC25/22

PULSE
DAIL

R116

R0603

Q12 TO-92\EBC

C87
NA

C0603

R138
4K7
R0603

+12V

411

+

-

0V

R150
510K

R0603
C101

562

C0603

R74
0
R0603

R94
NA
R0603

Q10

TO-92\EBC

12
13

C65

22P

C0603

R85

C108
104 R0603

RY1

500 OHM

RY1

R110
100K
R0603

0

R124

27 R0603

R130
27 R0603

R10

Q15
TO-92\EBC

10uF/100V

10K
R0603

VB

IC5
DIP4

EC5\5

R152

KX-TC1205RUB/W/S/F SCHEMATIC DIAGRAM (Base Unit)

26.2. RF Unit (Base Unit)

ANT1
ANTENNA
PAD3

61

2.2uH
L7.5

1

ZD11

15V/0.5W
ZD7.5

TP

C5
NA

L1

C0603

TP

C14
NA
C0603

3

DPX1
0830

ANT

DUP\5P

GRX

GTXRXTX

425

L12

TP

750nH
L1206

C110

C104

47P

39P

R0603

C0603

C133
39P
C0603

C46
102
C0603

T5
1436
IFT\7

3

4

5

1

C0603

103
C0603

2

C53
12P

R175
NA
R0603

R28

NA

R0603

C47

47UF/10V

Q3

SOT-23\ECB

CH+

R29
0
R0603

Q1
TO-92\EBC

C23
103
C0603

C103
EC5/5

2

R0603

TP

R39
NA
R0603

R12
100
R0603

R15
5K6

+

R46

2K2
R0603

R27
56
R0603

3

1

C22
103
C0603

R16
15K
R0603

R1
47
R0603

VB

R41
47K
R0603

C55
103
C0603

4

T2
1437

IFT\7

6

C20

2U2/50V
EC5/5

C29
104
C0603

C6
104
C0603

TP

+

R34
NA
R0603

R47
NA
R0603

C31
103
C0603

R33
0
R0603

C42
2U2 50V
EC5/5

C60

18P

C0603

C27
103
C0603

R22
4K7
R0603

C19
102

C0603

L10

1.2uH
L10

C49
103
C0603

Q4
SOT-23\
ECB

R0603

+

R17
0

C39
103
C0603

C26
7P
C0603

R35
100
R0603

R55
680
R0603

R0603

C17
10U/16V
EC5/5

+

2.1V

R14
10K

+

2U2/50V
EC5/5

0V

C125
10P

C0603

47U/10V
EC5/5

R42
10K
R0603

R53
15K
R0603

C30

C41

C56
18P

C0603

CF1 10.7MHZ
FILTER\1

1 3

R2
330

2

R0603

C7
102

C0603

C15
2U2/50V
EC5/5

IST

+

MIX
OUT

37

38

37

38

39

39

E-REC

VREF

40

40

IST Mix IN

41

41

VCC2

42

43

44

45

46

47

48

4.8V

10.7MHz

42

VCO CONT

43

VCO1

44

VCO2

45

C-RECT

46

RX CP

47

TX CP

PLL GND

48

VCC3 LO1 LO2 S-OUT CLK DATA STB FL-OUT

1

2

TX IN

123

+

C43
104

C0603

X1

11.15MHZ
XTAL\10A

R154
0
R0603

C54
2P
C0603

1 5

C11
473

C0603

34

35

36

35

36

N-REC2ND

MIX

MIX

IN

OUT

3

4

4

5

C35

VC1

18P

20P
C0603
C0603

C40
27P

R30
100K
R0603

TP

R37
100

R0603

C51
103
C0603

Q5

SOT-23

R56
2K2
R0603

34

5

C2
473
C0603

CF2
450
FILTER\2

234

33

33

VCC12ND

4.4V

6

678

R173

1K

L10

C1
47UF/10V
EC5/5

+

31

32

31

32

IN

450kHz

IC1

7

8

C0603
C37
150P

R170

R174

1K

1K

R0603

L10

R43
39K
R0603

C59
39P
C0603

C62
39P
C0603

1431
IFT\7

C8
104
C0603

R156

47

TP

13

T1

GND2DECIF

R3
15K

R0603

C16
27P

C0603

27

28

29

30

30

27

28

29

QUADIF

OUT

OUT

0V

COMP

FL-IN

OUT

9

10

R31
47K
R0603

10

R0603

11

11

EC5/5

1U/16V

R24
10K

R23

56K

R0603

C45
682
C0603

9

C34
470P
C0603

470P
C0603

R10

39K

R0603

26

26

C-NF

121314

121314

C38

+

C9

FIL-INF OUTDET.

25

DATA I/P

DATA O/P

RSSI

BAT. ALM

RO2

RO1

REC IN

EXP OUT

AF
OUT

C36
100P

C0603

R0603

R7
330K

R0603

470P

C0603

25

REF
OUT

REF
IN

R25
68K

R32
1M
R0603

C4
103
C0603

C10

AF-IN

R6
10K
R0603

24

24

23

23

22

22

21

21

20

20

19

19

18

18

17

17

16

16

15

15

R176

0
R0603

R0603

R5
10K
R0603

R8
10K
R0603

C12

C13

103

NA

C0603

C0603

C18
473

C0603

R13

C24
223

62K

C0603

R0603

R18

C32

4K7

2U2/50V

TP

+

C33
100P

C0603

C109

682
C0603

R26
47K
R0603

R155
47
R0603

EC5/5

R19
120K
R0603

R20
4M7
R0603

R0603

C44

105
C0603

R4
8K2
R0603

C131
R9
NA

R0603

IC4

4
3
2

R191

TP

TP

C25
822

C28
104
C0603

R21
47K
R0603

C0603

A

R190
10K
R0603

C128
104

C0603

TP

R0603

R194

R0603

1

68K

0

104

C0603
R192

120K
R0603

5
6
7
8

R193
100K

C130

R0603

10uF
C0603

C129

VREG

104

C0603

VERG
RX DATA
EXPO
COMP
RF-STB
RF-DATA
RF-CLK
CR-DET
VTX
TX DATA
GND

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

R40
22K
R0603

SOT-23

R48
22K
R0603

Q2

R36
220K
R0603

TP

C58
682
C0603

39P
C0603

R54
NA
R0603

C48
223

C0603

R0603

DV1
VCD2

C0603

C52
223

R49

47K

C61
104
C0603

R50
8K2

R0603

R44
100K

R0603

+

C50
22U/16V
EC5/5

C57

T6
1961
IFT\7

R38
82K
R0603

R51
1K8
R0603

R52
2M2
R0603

R45
330K
R0603

RX
TX

KX-TC1205RUB/W/S/F SCHEMATIC DIAGRAM (RF Unit (Base Unit))

27 SCHEMATIC DIAGRAM (Handset)

27.1. Handset

+

C63
100uF/10V
EC4\2.5
MINI

R112 1K R0603

62

CHG+

10V 0.5W
D\362

CHG-

TX DATA

R72

R71
NA
R0603

R79
1M
R0603

TP

L4

H

12u
L7.5

C86
104
C0603

ZD3

ZD1

TP

L5
12uH
L7.5

5V6 0.5W
ZD7.5

TP TP

BATT1
3V6/300mA
CNT2P\2.5

2

1M
R0603

NA
R0603

1

R80

Q9
SOT-23

VBAT

D1
D\362

3.9V0V

R73
NA
R0603

R81
1M
R0603

R85
1K
R0603

RSSI

R86
100K
R0603

C72
104
C0603

C69
104
C0603

ROW5
ROW4

ROW3
ROW2

ROW1
ROW0

0V to 5V
While charging

C73
104
C0603

C64
103
C0603

32.768kHz

R59 2K2 R0603
R60 2K2 R0603

R62 2K2 R0603
R66 2K2 R0603

R67 2K2 R0603
R69 2K2 R0603

R77 10K R0603

0V

0V

3.9V

R91(LOW BATT)

R87
100K
R0603

Q11
SOT-23

C74

473
C0603

3.5Vp-p

ALERT

CHARGE DET
TX DATA
ROW5
ROW4

ROW3

ROW2
ROW1
ROW0

CR-DET

C65
15P
C0603

C66
15P
C0603

33
32
31
30
29
28
27
26
25
24
23

X2

32.768KHz
XTAL\2R

3435363738394041424344

P15

P16

P17

P20

P14
P13
P12
P11
P10
P51

IC2

P50

QFP-44P

P67
P66
P65
P64

P61

P62

P63

R83
0

R0603

0V

R104
NA
R0603

L2
12uH
L4

C67
NA
C0603

BUZ CNTL

R105 10K R0603

P77

P76

P75

P74

VDD

XTIN

P73

XTOUT

P72
P71
P70
P07

3.9V

P06
P05
P04
P03
P02
P01

P00

TEST

RESET

XIN

XOUT

VSSNCP60

1213141516171819202122

TEST

XOUT VDD

XIN

RESET

X3

4.0 MHZ
XTAL\10

C70
33P

C0603

L3

12uH

L4

3.9V to 0V
While charging

R111
1K
R0603

C68
NA
C0603

R57 3K3 R0603
R58 47 R0603

DATA

R63 10K R0603

1

CLOCK

R64 10K R0603

2

RX PWR

3

RX DATA

R68 10K R0603

4

BACKLED

R70 2K2 R0603

5

TALK LED

6

LOW LED

7

COL3

8

COL2

9

COL1

10

COL0

11

4MHz

R82 0

R0603

R84
1M

R0603

C71
33P

C0603

LED2 LED3

GREEN
LED\SQ

R53
82
R0603

LED4
GREEN
LED\SQ

R61 330

R0603

R65 330

R0603

R74 100K R0603
R75 100K R0603
R76 100K R0603
R78 100K R0603

LED5

LED6

TALK

RECHG

GREEN
LED\SQ

RED
LEC\SQ

C84
102
C0603

VOL1
VOL2
RF-STB

D2
D\362

R54
100K
R0603

R56
2K2
R0603

D3
D\362

R55
39
R0603

Q7
STO-23

TP

BZ1
BZ
BZ12

RF-DATA
RF-CLK
VTX
RX DATA

LED1
GREEN
LED\SQ

1
2

GREEN
LED\SQ

Q8
SOT-23

2Vp-p

K1 RINGER

1 2

K5 PROG

1 2

ROW5

K8 *

1 2

ROW4

K11 7

1 2

ROW3

K14 4

1 2

ROW2

K17 1

1 2

ROW1

K20 TALK

1 2

ROW0

L7 120 OHM COIL SMD R0805

1 2

1 2

1 2

1 2

1 2
TP TP
1 2

1 2

K2 FLASH

K6 PAUSE

K9 0

K12 8

K15 5

K18 2

K21 AUTO

K3 LOUD

1 2

K7 CH

1 2

K10 #

1 2

K13 9

1 2

K16 6

1 2

K19 3

1 2

K22 DIRT

1 2

K4 REDIAL

1 2

KP\RO\4.5C

KX-TC1205RUB/W/S/F SCHEMATIC DIAGRAM (Handset)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

27.2. RF Unit (Handset)

ANT1
ANTENNA
PAD3

TP

L1

0.68UH
L7.5

TP

3

ANT

GRX

GTXRXTX

425

1

TP

C0603

C22
39P

DPX1
DPX0830
DUP\25P

R10
82K

R0603

Q1

C5
104
C0603

T3
1440

IFT\7

2

SOT-23\EBC

TX

T5
1856
IFT\7

3

4

5

C3
39P
C0603

1

63

27P
C0603

C11
NA
C0603

C0603

1

3

R0603

2

C54
10P

R106
150
R0603

6

4

C88
104

C0603

R11
5K6

TP

Q5

SOT-23\EBC

R14
15K
R0603

R47
2K2
R0603

RX

C18

2.2U/50V
EC5/2.5

C27
104

C0603

TP

C50
103
C0603

+

C31
103
C0603

2U2/50V

R43
100K
R0603

C55
103
C0603

C26
103
C0603

R24
4K7
R0603

C43

EC5/2.5

C17
102

C0603

R97
100K
R0603

R0603

+

L6

1.8uH
L7.5

R15
0

C40
103
C0603

C60
27P
C0603

R38
0
R0603

C0603

C24
22P
C0603

C56
1P

C15
10U/16V
EC5/2.5

2.1V

+

+

C29

2.2U/50V
EC5/2.5

0V

C42

47U/10V
EC5/2.5

C6
102

C0603

+

36

37

36

37

MIX
IN

10.7MHz

3.9V

2

3

2

3

C36
18P

C0603
C0603

C41
22P

10U/16V
EC5/2.5

R1
330
R0603

C8
473

C0603

35

35

N-REC2ND

MIX
OUT

4

456

VR8

VC1

20P

R34
220K
R0603

TP

C51

Q6

SOT-23\EBC

R52
680
R0603

1 5

34

34

5

R108

1K
R0603

+

CF1 10.7MHZ
FILTER\1

123

C12
2U2/50V
EC5/2.5

IST
MIX
OUT

38

38

39

39

E-REC

VREF

40

40

IST Mix IN

41

41

VCC2

42

42

VCO CONT

43

43

VCO1

44

44

VCO2

45

45

C-RECT

46

46

RX CP

47

47

TX CP

PLL GND

48

48

VCC3 LO1 LO2 S-OUT DATA STB FL-OUT

1

1

TX IN

C44

+

105

C0603

X1

10.245MHZ
XTAL\10A

R40
33

R0603

C2

C1

473

47UF/10V

C0603

EC5/2.5

C85

+

105

C0603

T1
1431

CF2
455E
FILTER\2

234

VCC12ND

IFT\7

C7
104
C0603

30

31

32

33

33

30

31

32

GND2DECIF

IN

3.9V 0V
450kHz

IC1

CLK

6

7

8

9

7

8

C0603
C39
150P

R110

R109

1K

1K

R0603

R0603

R44
39K
R0603

C57 15P

C59

C0603
27P
C0603

C62
56P
C0603

9

C35
680P
C0603

13

C0603

29

29

OUT

FL-IN

R0603

R35 47K

R0603

C52
103
C0603

C13
27P

QUADIF

10

10

R26
10K

T6 1960

R0603

28

IFT\7

VBAT

TP

R93
10K

R0603

R2
15K

C76
470P
C0603

R95 39K

R0603

26

27

26

27

28

OUT

COMP
OUT

11

11

R25
56K
R0603

C47
682
C0603

FIL-INF OUTDET.

C-NF

12

121314

+

C37
10U/16V
EC5/2.5

C49
223

C0603

C53
223

C0603

R49
47K

R0603

DV1

VCD2

25

25

DATA I/P

DATA O/P

RSSI

BAT. ALM

RO2

RO1

REC IN

EXP OUT

AF
OUT

13

R0603

C75
103
C0603

C77
470P
C0603

24

24

23

23

22

22

21

21

C23
102

20

20

C0603

19

19

C28
6800P
C0603

18

18

17

17

C32 104

C0603

REF

16

16

OUT
REF

15

IN

15

14

AF-IN

C38
100P
C0603

R28

120K

C87
N/A
C0603

R101 0 R0603

R45
100K

R0603

R50

8K2
R0603

C61
104
C0603

R94

330K
R0603

R29

6K8
R0603

R102

333

C34
100P
C0603

C79
103
C0603

C0603

R5
10K
R0603

C9
103
C0603

C0603

R0603

R6 10K

R0603

C16
473

R13
12K
R0603

R18
10K

R21
82K
R0603

R0603

C46
NA
C0603

RX

C78
103
C0603

R30

0

C20
NA
C0603

R16
10K
R0603

SOT-23\ECB

C0603

R41
68K
R0603

R51
2K7
R0603

C10
NA
C0603

R0603

Q3

C30
104
C0603

R20
1K8

C45
683

R7
NA

R0603

SOT-23\ECB

R36
2K
R0603

R98
4M7
R0603

R46
430K
R0603

TP

TP
R17
5K1
R0603

Q2

R103
1M
R0603

C48
47U/10V
EC5/2.5

R96

0

R0603

R23
47K
R0603

C80
103
C0603

REC1
SD153
SIP2

C33
104
C0603

+

R48
22K
R0603

R3
6K8
R0603

C14
103
C0603

R37
1K
R0603

R42
22K
R0603

TP

TP

C0603

R12
220K
R0603

R19
4K7

R0603

R91

R0603

0

R22
4K7
R0603

TP

MIC

TP

SOT-23\ECB

C58
103
C0603

R8
220K
R0603

R9

C21

82K

223

R0603

3.1V
(In Talk Mode)

MC1

Q4

R39
220K
R0603

R107
2K2
R0603

R99
4K7

R0603

TP

VOL1
VOL2
VB
RX DATA
RSSI
IC2-22
RF-STB
RF-DATA
RF-CLK
VTX
TXDATA
GND

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

TX

KX-TC1205RUB/W/S/F SCHEMATIC DIAGRAM (Handset (RF Unit))

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

64

28 CIRCUIT BOARD (Base Unit)

28.1. Component View

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

IC5

65

KX-TC1205RUB/W/S/F CIRCUIT BOARD (Component View (Base Unit))

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

28.2. Flow Solder Side View

+12V
GND

TXPOWER

TXGND

TX DATA
(DV1)

RX-VCO

TX-VCO

2nd Mix
(RF IC: 36)

IC1

IF IN
(RF IC: 32)

T.P ( CH change at test mode)

R98: for Changing the channel

IC2

XOUT
(CPU: 1)

VDD (CPU: 28)

CHG LD
(CPU: 26)

DETOUT
(RF IC: 27)

RST
(CPU: 27)

RX DATA
(CPU: 10)

RX DATA
(RF IC: 23)

RING

TIP

CHG DET
(CPU: 18)

TX DATA
(CPU: 17)

IC3

IC4

RING DET
(CPU: 24)

66

KX-TC1205RUB/W/S/F CIRCUIT BOARD (Flow Solder Side View (Base Unit))

29 CIRCUIT BOARD (Handset)

29.1. Component View

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

IC2

TX DATA
(DV1)

TX DATA
(CPU: 36)

67

VDD (CPU: 40)

(A) Battery Low

(G) Noise Squelch

KX-TC1205RUB/W/S/F CIRCUIT BOARD (Component View (Handset))

CHG DET
(CPU: 37)

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

29.2. Flow Solder Side View

V Bat
(RF IC: 33)

IF IN
(RF IC: 32)

RX VCO

TX VCO

IC1

2nd Mix
(RF IC: 36)

TXPOWER

KX-TC1205RUB/W/S/F CIRCUIT BOARD (Flow Solder Side View (Handset))

TXGND

68

KX-TC1205RUB / KX-TC1205RUW / KX-TC1205RUS / KX-TC1205RUF

69

I
KXTC1205RUB
KXTC1205RUW
KXTC1205RUS
KXTC1205RUF