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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
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. 660

         0 

o

C - 40 

o

C

Tone (DTMF)/Pulse

g

7

Mic

Speaker

Head Set

IC801

IC601

Q424

CPU

Handset

AMP

Receiving

T

ransmit

AMP

Dial

Q108

AMP

Q109

Q405, Q406

T1

Q101, Q103

Ringer

D3, D4

D9, D10

D7, D8

D5, D6

IC201

IC1

Handset

AMP

Sending

T

one

Detection

Mic

Speaker

Mic

Speaker

H/S

Data

T

LINE

C1

R1

R

SP-PHONE

AMP

Key Board 

Switch

8

When the bell signal is input between T/R, the signal are outputted at the speaker via the following path:
Tel line 

→ R1/C1 → D3/D4 → Pin 1 of IC1 → Pin 8 of IC1 → C6 → T1 → C625 → Speaker

In talk status, SW101 become ON and Q103 base changes to high level, causing Q103, Q101 to turn on and resulting in a line
loop.The loop current flows from D7 

→ Q101 → Q108 → R124 → D106 in that order. A pulse signal that repeated

switches between high and low logic is output from pin 22 of the CPU.This switches the line loop on and off, generating the dial
pulse signal.

The circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the
unit is used in the handsfree mode.

The speakerphone can only provide a one-way communication path.
In other words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both simul-
taneously. Therefore, a switching circuit is necessary to control the flow of the outgoing and incoming signals.
This switching circuit is contained in IC601 and consists of a Voice Detector, TX Attenuator, RX Attenuator, Comparator and
Attenuator Control. The circuit analyzes whether the TX(transmit) or the RX(receive) signal is louder, and then it processed the
signals such that the louder signal is given precedence.
The Voice Detector provides a DC input to the Attenuator Control corresponding to the TX signal.
The Comparator receives a TX and a RX signal, and supplies a DC input to the Attenuator Control corresponding to the RX sig-
nal.
The Attenuator Control provides a control signal to the TX and the RX attenuator to switch the appropriate signals on and off.
The Attenuator Control also detects the level of the volume control to automatically adjust for changing ambient conditions.

1. Transmission signal path:

The input signal from the microphone is sent through the circuit via the following path: MIC 

→ Pin 9 of IC601 → Pin 10 of

IC601 

→ Pin 3 of IC601 → Pin 4 of IC601 → R601 → C602 → Q108 → Tel line.

2. Reception signal path:

Signals receive from the telephone line are outputted at the speaker via the following path:Tel line 

→ Q108 → Q109 → C112

→ R600 → C603 → Pin 27 of IC601 → Pin 26 of IC601 → Pin 19 of IC601 → Pin 15 of IC601 → Speaker.

3. Transmission/Reception switching

The comparison result between TX and RX outputs as a DC level of Pin 25 of IC601.TX level is high ...... Pin 25 = Pin 21 -
6mVRX level is high ...... Pin 25 = Pin 21 - 150mVComparator output is connected to the attenuator control inside of IC601.

4. Voice detector

The output of the mic amp (Pin 10 of IC601) is supplied to Pin 13 of IC601 as a control signal for the voice detector.

5. Attenuator control

The attenuator control detects the setting of the volume control through Pin 24 of IC601 to automatically adjust for changing
ambient conditions.