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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 manufacturer’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: 0.3 mm, 0.6 mm and 1.0 mm.

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

0.3 mm X 100 g

0.6 mm X 100 g

1.0 mm X 100 g

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• Design and specifications are subject to change without notice.

Power Source:

Redial:
Speaker:

Microphone:
Dimensions (H x W x D):

Weight:

Dial Mode:

From telephone line

Last dialed telephone number 
Handset; 3 cm (1       ) PM dynamic type, 150 

         Electret condenser microphone
         Appr
         

ox. 95 mm x 167 mm x 224 mm

         Approx. 590

Tone (DTMF)/Pulse (10 pps)

g

7

RI

NG

E

R

 IC

Li

ne

ON

/O

F

F

Tr

ans

m

it

Am

p

H

ands

et

 A

m

p

R

ec

eiv

in

g

H

ands

et

 A

m

p

S

endi

ng

K

ey

boar

d

Sw

itc

h

Ringer

Handset

Q4, Q6, Q7

Q3

Q1, Q2,Q22

D1

LINE

T

R

DIALE

R

 IC

C1

R1

Q9

Speaker

Mic

KX-TS2361: BLOCK DIAGRAM

8

When the hook switch SW1 is ON (off-hook), the circuit is closed, and current is supplied to the base of Q2 via the diode bridge
D1 and Q2 is On 

 Q1 is ON (OFF-HOOK condition).

Q1 and Q2 are the dial pulse generating circuits, and are driven by the DIALER (IC1), when the DIALER Pin 10 of IC1 is LOW
 Q2 is OFF and Q1 is OFF. (break) If port Pin 10 is HIGH  Q2 is ON  Q1 is ON. (make)

The tone dialing circuit consists of a DTMF (Dual Tone Multi Frequency) signal generator (outputted from Pin 11 of the IC1) for
tone dialing, and also a circuit for outputting the signal to line.
The DTMF circuit identifies inputs from the 12 keys (1,2,3,4,5,6,7,8,9,0,   and #) by means of a total of seven frequencies, that
is four low frequencies (Low group) and threehigh frequencies (High group).

When a dial key is pressed, a DTMF signal is output from Pin 11 of IC1 as an analog synthetic wave.
The signal flow to the line is as follows.
Pin 11 of IC1 

 VR3  Q9  Q3  Q1  Tel Line.

The DTMF signal is sent to the line via the following path. Q9 and Q3 is an amplifier which is used to output the signal to line.
Shown below is the signal flow used to output the DTMF signal from the handset as a monitor tone when a dial key is pressed.
Pin 11 of IC1 

 R48  C33  Q7  C18  Handset Speaker.

The bell signal passes through C1 (R1) 

 supplying power to pin 1 of IC2.

The ring signal is output from Pin 5 of IC2, and its volume is adjusted in 3 steps (H-L-OFF) by SW3 then impressed on the
ceramic sound generator, and so is generated.
Output frequency is controlled by R2 and C3 following below formula.

High Group 

Low Group 

H1 H2 H3

L1

1

2

3

L2

4

5

6

L3

7

8

9

L4

0

#

Low Group  Frequencies  High Group 

Frequencies 

L1

697 Hz ± 1.5%

H1

1209 Hz ± 1.5%

L2

770 Hz ± 1.5%

H2

1336 Hz ± 1.5%

L3

852 Hz ± 1.5%

H3

1477 Hz ± 1.5%

L4

941 Hz ± 1.5%

-----

-----

f

2

 = 0.725 f

1

fswcep = 

750

C3 (nF)

R2 = 

2 + 72 +10

4

f

2 

(CH2)

x (1 - 0.04ln            )

1943

f

1