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5

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

6

• Design and specifications are subject to change without notice.

Power Source:

Redial:
Speaker:

Microphone
Input Jack:

:

Dimensions (H x

 

W x D):

Weight:

Operating Environment:

:

Dial Mode:

F
From 3 AA (LR6, R6, UM-3) batteries

rom telephone line

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

         Elect
         Telephone Line, Data port

ret condenser microphone

 

         Appr
         

ox. 95 mm x 167 mm x 224 mm

         Approx. 730

         5 

o

C - 40 

o

C

Tone (DTMF)/Pulse

g

7

Mic

Speaker

VDD

ST

OP

Head Set

LCD

IC801

IC601

Q421, Q424

CPU

Handset

AMP

Receiving

T

ransmit

AMP

Dial

Line Selector SW

Q108

AMP

Q109

LINE1

Hold

LINE2

Hold

Q405, Q406

T21

Q101, Q103

Ringer

D21

D1

10

IC201

IC22

Handset

AMP

Sending

DC-DC

Converter

T

one

Detection

Mic

Speaker

Mic

Speaker

H/S

T

LINE1

C21

R21

T1

Ringer

D1

IC1

C1

R1

R

D1

1

1

Q501~505

Q551~555

LINE1 LED

LINE2 LED

T

LINE2

R

SP-PHONE

AMP

IC303

Q302

CPU

Reset

IC304

3.7V

IC302

4.5V

Battery

Battery

Low

CPU

Key Board 

Switch

KX-TS2368  BLOCK DIAGRAM

8

When the bell signal is input between telephone line, the signal are output at the speaker via the following path: 

Tel line 

 R1 [R21]  C1 [C21]  D1 [D21]  IC1 (1) [IC22 (1)]  IC1 (8) [IC22 (8)]  C5 [C35]  T1 [T21]  C625  Speaker                

[ ] : in case of Line2 

• On hook

Q101 is open, Q101 is connected as to cut DC loop current and cut the voice signal. 

In talk status, RLY output from IC801 (45) changes to low level, causing Q103, Q101 to turn on and resulting in a line loop. 
Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit) and the following signal flow is 
for the DC loop current. 
(Line 1) Tip 

 POS101  D110  SW110  Q101  Q108  R124  D106  D110   (Line 1) Ring 

A pulse signal that repeated switches between high and low logic is output from IC801 (44). 
This switches the line loop on and off, generating the dial pulse signal. 

TEL line 

 POS101  SW110  Q101  C113  R125  C108  Q109   Q405  Q406  C414  VR402  CN401 

CN402 

 Speaker (H/S)      

Mic 

 VR401  Q421  Q424  C435  R437  Q108  SW110  POS101  Tel Line 

      

This circuit is used to sense the status of the line (busy tone or dial tone) during Auto Redial. 

D110 

 Q101  C201  R201  R205  IC201 (5)  IC201 (1)  D202  R208  Q201  IC801 (50) 

When the subscriber hangs-up, check the intermittent tone. If cycle tone is detected, the collector of Q201 goes to a low logic.