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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. 670

         5 

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

To

n

e

Detection

Mic

Speaker

Mic

Speaker

H/S

Data

T

LINE

C1

R1

R

SP-PHONE

AMP

Key Board 

Switch

D2

LED 1

Ringer indic

a

tion LED

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.

• On hook

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

• Off hook

Q101 turns on thus providing an off-hook condition (active DC current flow through the circuit) and the following signal flow id for
the DC loop current
T 

→ PO101 → L1→ D7 → Q101 → Q108 → R124 → D106 → D10 → L2→ R

• Receiving signal flow :

Tel line 

→ PO101 → Q101 → R115 → R120 → R121→ Q108 → R123 → R125 → C108 → Q109 → C112→ R401→ C405 → R405 → Q405

→ R409 → C408 →Q406 → C414 → VR402 → Headset Jack → Handset (SP)

• Transmission signal flow :

MIC 

→ C422 → L3 → VR401 →  R432 → C426 → Q424 → C435 → R437 → Q108 → Q101→ D7 → L1 → PO101 → Tel Line

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

D7 

→ Q101 → C201 → R201 → R205 → Pin 5 of IC201 → Pin 1 of IC201 → D202 → R208 → Q201

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