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Sony IT-M708 Operation Manual

4 line-phone for soho
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NEW TECHNICAL THEORY
FOR SERVICING
Internal use only
IT-M704/M804
OPERATION MANUAL
4 Line-Phone for SOHO

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Summary of Contents for Sony IT-M708

  • Page 1 NEW TECHNICAL THEORY FOR SERVICING Internal use only IT-M704/M804 OPERATION MANUAL 4 Line-Phone for SOHO...

  • Page 2: Table Of Contents

    CONTENTS Out Line of IT-M704/M804....................3 Feature.......................... 3 1-1. 1-2. Feature List........................4 1-3. External appearance & LCD Layout................7 1-4. LCD Specifications....................... 9 1-5. System Organization....................9 Specification ........................... 11 BlockDiagram......................... 14 Maincomponent (Semiconductor) ..................14 Board Structure ........................15 Explanation of the Circuit.......................

  • Page 3: Out Line Of It-M704/M804

    IT-M704/IT-M804 is 4 Line-Phone for SOHO (Small office Home Office) that at 1. Outline 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.

  • Page 4: Feature List

    1-2. Feature List         General IT-M804 IT-M704 Type Corded Corded LINE 4Line 4Line Power Supply AC Adapter AC Adapter Station Capability ○ (3-row) ○ (1-row) LCD Display ○ (On Idle) ○ (On Idle) Time/Day Indicator ○ ○ Dialing Monitor ○...
  • Page 5 Telephone Section IT-M804 IT-M704 Line Status Indicator Back light key Back light key (orange) (orange) ○ (LED) ○ (LED) Conference ○ (LED) ○ (LED) Busy Redial ○ (LED) ○ (LED) Do Not Disturb Function ○ (LED) ○ (LED) Intercom ○ ○...
  • Page 6 KEY & LED IT-M804 IT-M704 ○ ○ (Orange) ○ ○ (Orange) LINE1 SELECT ○ ○ (Orange) ○ ○ (Orange) LINE2 SELECT ○ ○ (Orange) ○ ○ (Orange) LINE3 SELECT ○ ○ (Orange) ○ ○ (Orange) LINE4 SELECT ○ ○ (Red) ○...

  • Page 7: External Appearance & Lcd Layout

    1-3. External appearance & LCD layout  IT -M804 Back Light LED is used on LINE 1-4 and LOWER keys.
  • Page 8 IT-M704 Back Light LED is used on LINE 1-4 and LOWER keys. Message ERASE/CLEAR FLASH PROGRAM LOWER 4-LINE TELEPHONE IT-M704 LINE1 LINE3 LINE4 LINE2 TRANSFER HOLD INTERCOM CONF REDIAL/PAUSE ALL PAGE BUSY REDIAL PAGE MUTING DO NOT VOLUME DISTURB SPEAKER PHONE TONE HEADSET...

  • Page 9: Lcd Specifications

    1-4. LCD specifications liquid crystal Indication POSITIVE lightning system reflection visual angle 6:00 drive Dynamic 5.2V 1/16 Duty 1/4 Bias External form IT-M804 34 x 65 mm size IT-M704 20 x 65 mm View Area IT-M804 24 x 60 mm IT-M704 12 x 60 mm Character size...
  • Page 10 Spectrum structure of Line 1 Spectrum of Line-1 Voice carrier of receiver side for the extension call Control signal carrier Voice Base band Voice carrier of caller side for the extension call ０． ３KHz 3.4KHz 281.25KHz 321.43KHz 450.KHz 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.

  • Page 11: Specification

    2. SPECIFICATION TELEPHONE SECTION SPECIFICATION ITEM UNIT CONDITION OFFHOOK DCR Ω 20mA DC ONHOOK DCR 100V DC MΩ RINGER IMPEADANCE 75V AC 20Hz KΩ AC IMPEADANCE 300Hz 30mA DC Ω 1KHz 1.5KHz 3.4KHz SPEED 0Kf Length MAKE RATIO DIAL 0 MIN PAUSE TONE FREQ...
  • Page 12 TRANSMIT HANDSET 1KHz, -40dBV LEVEL HEADSET 1KHz, -50dBV 1KHz, -50dBV SIDE TONE HANDSET 1KHz, -40dBV NOR position BELL OPERATION VOLT(CONT) Vrms BELL FREQ : 20Hz RINGER HIGH BELL FREQ LEVEL :20Hz, 75mV CAS TONE DETECT LEVEL FSK DATA RECEIVE LEVEL CAS TONE DETECT TIME STTUTER TONE DETECT LEVEL TERCOM SECTION TX...
  • Page 13 INTERCOM SECTION RX SPECIFICATION ITEM UNIT CONDITON HANDSET MOD: 30% 321.428KHz SENSITIVITY S/N : 30dB 281.25KHz RF INPUT:-25dBV DISTORTION HANDSET MOD: 1KHz 30% HEADSET 321.428KHz RF INPUT:-25dBV OUTPUT HANDSET MOD: 1KHz 30% LEVEL HEADSET 321.428KHz H/S,HD/S VR:Max SP VR: Position AUDIO HANDSET 300Hz...

  • Page 14: Blockdiagram

    3. Hardware block diagram     See attached paper 4. Main component (semi conductor) NAME TYPE MAKER FUNCTION PACKAGE UPD78078 8bit One-Chip CPU(4.5MHz) 100pin QFP FOR MAIN CONTROL ROM 60KB RAM 2KB TIMER 16bit x1 8bit x4 WDT,CLOCK,BUZZER SIO x3 CSIO I2BUS ASYNC A/D 8bit x8 D/A 8bit x2 PIO 88ports SUB X’TAL FOR CLOCK/BACKUP MODE...

  • Page 15: Board Structure

    5. Board structure Organization of boards. NAME FUNCTION SIZE Material Soldering MAIN Except KEY/LED 198 x 167 Both side Silver- through Reflow /Dip Paper phenol board KEY/LED 115 x 115 side paper phenol Hand Soldering board IT-M804: Both side Silver- through Soldering side: Reflow 144.4 x 119.6 Speed Dial Key...

  • Page 16: Explanation Of The Circuit

    6. Explanation of the Circuit 6 -1 MAIN CPU CPU μPD78076is used for main control of this equipment        .   Specifications 1 FREQUEN 4.5MHz 2 MEMORY ROM 60KBytes RAM 2Kbytes 3 TIMER 16bit TIMER x 1CH BELL OUTPUT 8bit TIMER x 4CH INTERCOM CARRIER DATA CARRIER TIMER INTERRUPT 4 SIO CSIO x 3CH EEPROM I/F...
  • Page 17 CPU PORT MAP A) MAIN CPU PORT MAP ASSIGNMENT PIN NAME ACTIVE FUNCTION NAME OF SIGNAL 1 P120/RTP0 HEAD SET DETECT L: HEAD SET H: NO HEADSET 2 P121/RTP1 HEAD /HAND SET CONT L: HAND SET H: HEAD SET 3 P122/RTP2 H/S TONE CNT H:H/S TONE OUT 4 P123/RTP3...
  • Page 18 ASSIGNMENT PIN NAME ACTIVE FUNCTION NAME OF SIGNAL 37 P70/SI2/RxD RX DATA INPUT RX DATA INPUT 38 P71/SO2/ＴxD TX DATA OUTPUT TX DATA OUTPUT (780bps) 39 P71SCK2/ACK SUB CPU RESET SUB CPU RESET SIGNAL 40 VSS 41 P20/SI1 CID DO FRM SUB CPU SUB CPU DO SIGNAL 42 P21/SO1 CID DI TO SUB CPU...
  • Page 19 APPORTIONMENT PIN NAME ACTIVE FUNCTION NAME OF SIGNAL ON HOOK : RINGER VOLUME OFF HOOK : HAND SET VOLUME VOLUME R/H VOL 1 R/H VOL 2 85 P103 R/H VOL2 STD BY/OFF 86 P30/TO0 PULSE DIAL PULSE BREAK : H MAKE/ON CALL : L 87 P31/TO1 BEEP OUT...
  • Page 20 APPORTIONMENT ACTIV PIN-NAME FUNCTION NAME OF SIGNAL 16 P54 CALL ID MODE SET LINE 2 TO FSK RECEIVER IC502 L: DETECTION OF DUAL TONE ALARM SIGNAL H: FSK SIGNAL RECEPTION 17 VSS 18 P55 CALL ID RX DATA LINE 3 FROM FSK RECEIVER IC503 19 P56 CALL ID DATA CLOCK LINE 3...
  • Page 21 CPU timer CPU clock frequency 4.5 MHz Data transmission career TM5 is used. 1/10 of main clock frequency Input clock 4.5MHz (main clock frequency) Output clock 450KHz TM: Timer Career for Extension TM6 is used. 1/16 or 1/14 of main clock frequency Input clock 4.5MHz (main clock frequency) Output clock 281.25KHz when sending signal Output clock 321.43KHz when receiving signal...
  • Page 22 KEY SCAN TIMING Following chart shows a state in case that the key which connected with KEY SCAN 0(KS 0/P50) and KEY IN 0(KI 0/P40)is depressed. key input detection KEY SCAN is not implemented in IDLE state, and all SCAN ports turn to ACTIV then observes the key is depressed.
  • Page 23 LED OUTPUT KEYSCAN signals (P50-P57) are latched by external latch ICs(IC952,IC953 /TC74HC273),and the port is expound then LED is used. LED PORT LINE1 LINE2 LINE3 LINE4 INTER SPEKER BUSY LATCH1 CALL PHONE REDIAL CONF DND LOWER MUTE VISUAL LATCH2 MESSAGE WAITING DATA "1"...
  • Page 24 Control of LCD Controller As below shows, LCD controller writes/reads the date for letters or characters into/from the register, and controls the ports. LCD writing timing more than 1uS LCD reading timing take the data into note : Writing and reading to LED extension port should be done under interruption restraint condition.
  • Page 25 Power cut detection and backup When the unit operate by batteries, the unit detect Power cut by POWER DOWN Port in CPU and keeps telephone conversation for 30 minutes (in case of new batteries being used) Power cut detection Power source is observed at DC jack input, and if this power goes down under 7V, Power cut is noticed to CPU.

  • Page 26: I/F For Telephone Line

    6-2. I/F for Telephone line This chapter is for an interface (I/F) to connect with telephone line and there are 4 I/Fs for 4 lines (Line 1-4) on IT-M804/M704. I/F for Line 1, 2, 3, and 4 are similar circuit, but Line 1 has control data/circuit for extension call. One DATA PORT is equipped and the line which DATA PORT being connected is selectable by switch.
  • Page 27 Outline of Line I/F RINGER detection HOLD IN USE detection CALL-ID detection LOOP CURRENT circuit...
  • Page 28 Dialing & connection timing LINE connection timing DP Dialing During DP dialing, mute of receiving is performed. Detail of Dial signal DB Dialing...
  • Page 29 Busy tone detection Signal of BUSSY/STUTTER TONE is input to BUSSY/STUTTER TONE detection IC(IC605) through SPEECH N/W (NETWORK) IC(IC601). 15mS～545mS If ON and OFF of Busy tone described in right table is 450mS～545mS continued/repeated, CPU considers being in BT. 450mS～545mS 450mS～545mS 450mS～545mS STUUTER TONE detection...

  • Page 30: Speech Net Work (N/W)

    6-3. SPEECH N/W Voice signal from LINE I/F is connected to SPEECH N/W IC (IC601) TEA11110AT from secondary side of AF TRANSFORMER. LINE signal of 2W/4W conversion is made inside SPEECH N/W, and receiving signal is connects to RECEIVER AMP IC(IC604) KA8602 or SPEAKER PHONE IC ((IC701)MC33219 through ANALOG SW.

  • Page 31: Speaker Phone

    6-4. SPEAKER PHONE MC33219 (IC701) is used as SPEAKER PHONE IC. By this IC, voice switch is performed and SPEAKER PHONE operation is performed without howling. Operation mode to this IC is divided into IDLE, TX, and RX. By comparing transmitting signal and receiving signal, it shifts to each mode, and ATT(attenuation) is inserted into TX/RX circuit.

  • Page 32: Control Data Transmission Circuit

    6-5. Control data transmitting circuit Data transmitting function is equipped for mutual communication of telephone. Specifications for Data communication Data transmitted line LINE 1 is used. Frequency 450KHz Modulation system ASK by CARRIER ON/OFF CARRIER ON : DATA "0" CARRIER OFF : DATA "1" Transmitting speed 780bps Avoiding method for...

  • Page 33: Extension Call Circuit

    6-6. Extension Call Extension call is realized by using a carrier out of sound/voice frequency range and AM modulation is applied. Specifications 1 CARRIER frequency Transmitting : 281.25KHz, Receiving : 321.43KHz Made of CPU TIMER frequency. 2 Modulation system AM modulation Standard modulation ratio:30% 3 EXPANDER/COMPRESSER equipped...
  • Page 34 Extension call circuit Transmitting : 281.25KHz Receiving : 321.43KHz COMPANDER COMPANDER IC KA8507 is used for extension call in order to secure DYNAMIC RANGE and improve S/N ratio. COMPRESSOR and EXPANDER are equipped into one chip of COMPANDER. Compression of amplitude is performed by COMPANDER and prevents over-modulation. Expanding amplitude by EXPANDER, it is possible to improve S/N ratio when the signal is weakly inputted.
  • Page 35 CONPANDER...

  • Page 36: Caller-Id Circuit

    6-7 CALL-ID Circuit   SUB-CPU uPD78082(IC500) is equipped in order to control FSK DECORDER for CALLER-ID on 4 LINES.(only IT-M804) SUB-CPU communicates with MAIN CPU by serial signal. 1. FSK decoder mode is set by direction of MAIN-CPU. 2. Receiving terminal of FSK Decoder is observed.  3.
  • Page 37 FISK DECORDER CONTROL FSK Decoder IC CMX 602 (IC501,IC502,IC503,IC504,IC505)is used in order to receive FSK data of CALLER-ID, CALL WAITING, VISUAL MESSAGE WAITING and detect CAS tone during a telephone call. LINE1 HOOK LINE2 HOOK LINE3 HOOK LINE4 HOOK FSKSEL TONE RXOUT SPEECH...
  • Page 38 Timing for CALL ID data reception Caller-ID data when receiving Line Signal Line Signal Line Signal Line Signal Ch. seizure Signal like 01010101 300bit Mark Mark signal 300bit Data Packet data 48Byte(max.) Receiving timing during telephone Call Waiting data when receiving Receiving Talk Talk...

  • Page 39: Regulation

      Receiving data taking timing into CMX-602    Details of data receiving Cx indicates C1 through C4. 7. Regulation Safety requirement/Standard Canada Interface for telephone line FCC Part 68 IC CS-03 Spurious/Interference wave emission FCC Part 15 FCC Part15 Safety requirement for telephone UL UL1950 C-UL Safety requirement for AC adapter...

  • Page 40: Attached-1 Block Diagram

    Attached-1 Block Diagram...
  • Page 41 IT-M704/M804 Sony Corporation 2000E1600-1 Audio Entertainment Group 9-927-900-21 Printed in Japan ©2000.5 Published by PE General Engineering Dept.

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