Sony IT-M708 User manual

4 Line-Phone for SOHO

NEW TECHNICAL THEORY

FOR SERVICING

IT-M704/M804

OPERATION MANUAL

Internal use only

CONTENTS

1. Out Line of IT-M704/M804....................................................................................................3

1-1. Feature..........................................................................................................................3

1-2. Feature List...................................................................................................................4

1-3. External appearance & LCD Layout...........................................................................7

1-4. LCD Specifications.......................................................................................................9

1-5. System Organization....................................................................................................9

2. Specification...........................................................................................................................11

3. BlockDiagram.........................................................................................................................14

4. Maincomponent (Semiconductor)........................................................................................14

5. Board Structure......................................................................................................................15

6. Explanation of the Circuit.......................................................................................................16

6-1. Main CPU .....................................................................................................................16

6-2. I/F for telephone line.....................................................................................................26

6-3. Speech Net Work (N/W)..............................................................................................30

6-4. Speaker Phone ............................................................................................................31

6-5. Control Data Transmission Circuit..............................................................................32

6-6. Extension Call Circuit...................................................................................................33

6-7. Caller-ID Circuit.............................................................................................................36

7.Regulation...............................................................................................................................39

Attached -1Block diagram........................................................................................................40

1. Outline

IT-M704/IT-M804 is 4 Line-Phone for SOHO (Small office Home Office) that at

most 16 telephones can be used via 4 lines.

IT-M704 is low-end model that JOG DIAL and CALLER ID function is removed

from IT-M804. IT-M704/M804 is for North America.

1-1. Feature

1. It is possible for each phone to dial, receive, and hold by using one of 4 lines.

2. Each telephone controls each other by data communication using carrier out of

audio frequency range of LINE 1.

3. It is possible to make an extension call between each telephone on each line using

carrier out of audio frequency range of LINE 1.

4. SPEAKERPHONE can be used on both outside line and extension line.

5. It is possible to transfer outside line to each telephone on each line.

6. It is possible to make a conference call by three persons.

7. Busy Redial and Visual Message Waiting operation by Stutter Tone is possible

because each phone has TONE detection circuit.

8. 3-row LCD is attached on IT-M804 and 1-row LCD is attached on IT-M704.

9. Data port/jack is attached (choose the line among LINE 2 -LINE 4 by switch)

10. CALLER-ID, CALL-WAITING and VISUAL MESSAGE WAITING functions are

attached on IT-M804.

Only VISUAL MESSAGE WAITING function is attached on IT-M704.

11. Phone Directory, Speed Dial, Caller ID List is equipped on IT-M804.

Only Speed Dial is equipped on IT-M704.

12. JOG DIAL is equipped on only IT-M804.

13. HEAD SET jack is equipped.

14. Depending on 9 volt battery 6F22(006P), it is possible to make a call for 30 minutes

after power cut.

Phone Directory Speed Dial Caller ID List

IT-M804 100(max) 16 200

IT-M704 -28 -

1-2. Feature List

General

IT-M804 IT-M704

Type Corded Corded

LINE 4Line 4Line

Power Supply AC Adapter AC Adapter

Station Capability 16 16

LCD Display ○(3-row) ○(1-row)

Time/Day Indicator ○(On Idle) ○(On Idle)

Dialing Monitor ○○

Call Timer ○○

Jog Dial ○-

Back-up Battery 9V Battery 6F22(006P) 9V Battery 6F22(006P)

Back-up Memory EEPROM USE EEPROM USE

Wall Mountable ○○

Intercom/ Paging/Transfer One line (on LINE 1) One line (on LINE 1)

Multi-Language ○(Spanish) ○(Spanish)

Visual Message Waiting ○(LED)/(LCD)

Stuttered Dial Tone (Stutter

signaling) & FSK

○(LED)/(LCD)

Stuttered Dial Tone (Stutter

signaling) only

Caller ID Section

IT-M804 IT-M704

Jog Dial ○-

Caller ID with Call Waiting ○-

Caller Name on Display ○-

Memory Match Ring ○-

Caller ID LIST ○(100) -

Dial from CID Data ○-

All / Individual Delete ○-

New Call Indicator ○(LED) -

Telephone Section

IT-M804 IT-M704

Line Status Indicator

Back light key

(orange) Back light key

(orange)

Conference ○(LED) ○(LED)

Busy Redial ○(LED) ○(LED)

Do Not Disturb Function ○(LED) ○(LED)

Intercom ○(LED) ○(LED)

Page (Station Page) ○○

All Page ○○

Call Transfer ○○

Data jack Capability ○

(Choose LINE2 –LINE4) ○

(choose LINE2 –LINE4)

Speakerphone ○(LED) ○(LED)

Speakerphone Volume ○

16 steps by S/W control ○

16 steps by S/W control

Speed Dial ○(16 Name) ○(28)

Lower Key ○(LED) ○(LED)

Hold ○(Line LED Flashing) ○(Line LED Flashing)

Muting ○(LED) ○(LED)

Redial/Pause ○○

Flash/Call Waiting ○○(Flash)

Program ○○

Handset Volume ○

3 steps by S/W control ○

3 steps by S/W control

Ringer Volume ○

4 steps by S/W control

(High, Mid, Low, Off)

○

4 Steps by S/W control

(High, Mid, Low, Off)

KEY & LED IT-M804 IT-M704

KEY LED KEY LED

LINE1 SELECT ○○(Orange) ○○(Orange)

LINE2 SELECT ○○(Orange) ○○(Orange)

LINE3 SELECT ○○(Orange) ○○(Orange)

LINE4 SELECT ○○(Orange) ○○(Orange)

CONFERENCE ○○(Red) ○○(Red)

HOLD ○○

(LINE LED flash) ○○

(LINE LED flash)

REDIAL/PAUSE ○- ○-

FLASH/CALL WAITING ○- ○-

DO NOT DISTURB ○○(Red) ○○(Red)

MUTING ○○(Red) ○○(Red)

SPEAKER PHONE ○○(Green) ○○(Green)

PROGRAM ○- ○-

SPEED DIAL ○(16) - ○(28) -

LOWER ○○(Red) ○○(Red)

12KEY ○- ○-

JOG DIAL ○- - -

ERASE/CLEAR ○- - -

BUSY REDIAL ○〇(Red) ○○(Red)

INTERCOM ○〇(Red) ○○(Red)

TRANSFER ○- ○-

PAGE ○- ○-

ALL PAGE ○- ○-

NEW CALL INDICATOR - 〇(Red) - -

Visual Message

Waiting - 〇(Red) - ○(Red)

VOLUME +/- ○- ○-

JACK IT-M804 IT-M704

LINE1/2 ○(4pin) ○(4pin)

LINE3/4 ○(4pin) ○(4pin)

DATA ○(2pin) ○(2pin)

HANDSET ○(4pin) ○(4pin)

HEADSET ○(3pin) ○(3pin)

POWER ADAPTER ○(12V/200mA) ○(12V/200mA)

1-3. External appearance & LCD layout

IT -M804

Back Light LED is used on LINE 1-4 and LOWER keys.

IT-M704

Back Light LED is used on LINE 1-4 and LOWER keys.

LCD LAYOUT PLAN

LINE1 LINE2 LINE3 LINE4

PAGE

CPX-957

ALL PAGE

PROGRAM

INTERCOM





CONF TRANSFER HOLD

VOLUME

REDIAL/PAUSE



BUSY

REDIAL



MUTING



DO NOT

DISTURB



SPEAKER

PHONE

4-LINE TELEPHONE IT-M704

LOWER

123

MIC

Message



ERASE/CLEAR FLASH

HEADSET

TONE

MESSAGESLINE1 LINE2 LINE3 LINE4

1-4. LCD specifications

liquid crystal STN

Indication POSITIVE

lightning system reflection

visual angle 6:00

drive Dynamic 5.2V 1/16 Duty 1/4 Bias

IT-M804 34 x 65 mmExternal form

size IT-M704 20 x 65 mm

IT-M804 24 x 60 mmView Area IT-M704 12 x 60 mm

Character size Dot Character 3.1 x 6.1

Connection By conductive rubber connector

CONTACT PITCH 0.75mm/0.8mm

1-5. System organization

Each phone uses out of audio frequency range of Line 1 and controls data and

makes a extension call.

System organization chart

Spectrum structure of Line 1

Control data: ASK modulation by On and OFF of 450 KHz carrier

Data transmission speed: 780bps

Extension call: AM modulation, dial side 281.25KHz, receiving side 321.43KHz

Compander IC is equipped for improving better calling quality.

note

ASK: Amplitude Shift Keying

Spectrum of Line-1

０．３KHz 3.4KHz 281.25KHz 321.43KHz 450.KHz

Voice Base band Voice carrier of

caller side for the

extension call

Voice carrier of

receiver side for

the extension call Control signal

carrier

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