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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 manufac
turer's specific instructions for the melting points of their products and any precautions for using their product with other materi-
als. 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.

0.3mm X 100g

0.6mm X 100g

1.0mm X 100g

6

• Design and specifications are subject to change without notice.

Power Source: 

From telephone line
From 3 AA (LR6, R6, UM-3) batteries

Memory Capacity: 

        50 Caller ID memory, 50 Directory memory.

Redial:

The unit redials the last dialed number

Microphone:

         Electret condenser microphone

Input Jack:

         Telephone Line

         Approx. 93 mm x 172 mm x 220 mm

Dimensions (H x W x D):
Mass (weight): 

         Approx. 550

Operating Enviroment: 

         0 

o

C - 40 

o

C, 20 % - 80 % relative air humidity (dry)

g

Speaker Unit: 

        Unit: 5.7cm (2.5") PM magnetic type 32     

                                                  Handset: 3 cm (1

13

/

16

") PM dynamic type 150

7

1

R

5

D ,

3

D

1

C

P

1

T

P

S

      D1

C1

MIC (2AP)

6

D ,

4

D

1

CI

D601

Q107

Q101, Q103

D101

T     

IC601

Handset/Headset

R    

SP

MIC

Q108

IC201, Q201

  D302

Q110

D301

 IC871

           IC302

      IC831

1AP PCB

D505

 IC861

IC651

4.5V

2AP PCB

IC501, Q501, Q502

Batter

y

LCD

KX-TS880 / 

TS2388 Ser

ies :

 BLOCK DIA

GRAM

Q422

        Q401, Q402, Q403

MICON

Ringer indication LED

LED1 (Small PCB)

JOHN SMITH

1234567890

RINGER

IC

INUSE / EXHOOK

Line

ON/OFF

Handset Receiving

Amp

EEPR

OM

128K

TIPIN

Sidetone

Br

idge

RESET

BA

TTLO

W

Reset IC

2.7V

Handset

Sending

Amp

K

e

yboard

Switch

RIN

GIN

Batter

y

 Lo

w

Detector

Regulator

3.3 V

FSK / DTMF Circuit

W

a

k

eup Circuit

WAK

EU

P

Dumm

y Ringer

Circuit

SP-Phone

Circuit

Expander

I/O IC

DRIN

G

DTM

F

Dial T

o

ne

Detect

Ex-Hook

Detect

T

O

NE_DET

In Use

Detect

PGAIN2

RING_

DET

D801

8

When the bell signal is input from LINE to T/R (when the telephone rings), the signal is output at the speaker via the following
path :
T/R 

 R1/C1  D1/LED1 (small PCB)  D3/D4  IC1 (pin8)  IC1 (pin5)  PC1  C5  SW2 (R7/R8/R9) T1  Speaker

When {AOH} button is pressed during incoming call (Caller ID AOH mode), dummy ring function will be activated.
The bell signal from LINE stops and Caller ID is received.  
Set will keep on ringing by the dummy ring function until the handset is picked up / speakerphone is on.

The dummy ring signal is generated from IC801 via the following path :
(Speakerphone will be activated during dummy ring)
IC801 (pin 89)

 R901  Q2  SW2 ( R11/R12/R13 )  C8  R615  C616  IC601 (pin 19)  IC601 (pin 15) C618 

Speaker

• On hook

Q101 is OFF, on-hook condition where DC loop is disconnected and voice signal flow is cut.

• Off hook

During Off-Hook, pin 1_3 of SW101 and Q101 is ON, providing an off-hook condition (active DC current flow through the circuit)
and the following is the signal flow :
T 

 POS101  L101  D101(+)  Q101  R180  Q107  R119  D103  D101(-)  L102  R

• Receiving signal flows:

LINE 

 Q101  R180  C109  C401  R401  L412  L401  Q401  C404  R405  R417  L405  C405  L406

 Q402  C408  R413  L409  Q403  C410  VR401  SP (handset)

• Transmission signal flows:

MIC (handset) 

 C422  VR402  R423  C425  L421  R430  Q422  R429  C429  L107  Q107  Q101 

R180 

 LINE

• Pulse Dial

A pulse signal switches repeatedly between high and low logic is output from IC801 (pin 73), on and off the line loop, generating
the pulse dial signal.