Toshiba GD-1221 Service Manual Download Page 49

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GD-1220/1221

DIALING/COMMUNICATION CONTROL

3 - 15

- Probing/Ranging (Phase 2)

Examines the line characteristics and sets the parameters for the modulation related items such
as the modulating speed.

Transmitter

Receiver

Signal name

Abbreviation

Function

Remarks

INFO sequence

INFO0c

Informs the modem capability

such as modulating speed

and frequency transmission

capability (two frequency

bands (high and low) used to

examine the line characteris-

tics), and requests for adjust-

ing.

Transmission rate: 600 bps

Tone B

Synchronization between the

modems by 1200 Hz tone sig-

nal

B is a signal that shifts the

phase B 180°.

Tone B

Line probing signal L1

Tone signal to analyze the line

characteristics by probing

Probing is to examine the line

characteristics.

Tone signal between 150

Hz and 3,750 Hz in units of

150 Hz

Line probing signal L2

Signal name

Abbreviation

Function

Remarks

INFO sequence

INFO0a

Informs the modem capability

such as the modulating speed

and frequency transmission

capability.

Transmission rate: 600 bps

Tone A

Synchronization between the

modems by 2,400 Hz tone

signal

A is a signal that shifts the

phase A 180°.

Tone A

INFO sequence

INFO0h

Based on the analysis of the

line probing signal sent from

the transmitter, it informs the

pre-emphasis filter and modu-

lating speed to be used for the

data transmission.

Transmission rate: 600 bps

Summary of Contents for GD-1221

Page 1: ...SERVICE MANUAL FACSIMILE GD 1220 1221 File No SME060017B0 R060121B2200 TTEC Ver02_2008 08 ...

Page 2: ...ghts reserved Under the copyright laws this manual cannot be reproduced in any form without prior written permission of TOSHIBA TEC CORPORATION No patent liability is assumed however with respect to the use of the information contained herein ...

Page 3: ...n the right and 10 cm 4 on the rear The equipment shall be installed near the socket outlet and shall be easily accessible Be sure to fix and plug in the power cable securely after the installation so that no one trips over it 2 General Precautions at Service Be sure to turn the power OFF and unplug the power cable during service except for the service should be done with the power turned ON Unplu...

Page 4: ... or equivalents Return the equipment to the original state and check the operation when the service is finished 3 Important Service Parts for Safety The breaker door switch fuse thermostat thermofuse thermistor batteries IC RAMs including lithium batteries etc are particularly important for safety Be sure to handle install them properly If these parts are short circuited and their functions become...

Page 5: ...CONTROL 3 1 3 1 Circuit Connection and Procedure to Change Mode 3 1 3 1 1 Dial call up transmission to a telephone circuit 3 1 3 1 2 Selection of the communication mode 3 2 3 1 3 Procedure to select the transmission mode 3 2 3 2 Signaling System Diagram and Signal Forms 3 3 3 2 1 Circuit control signals 3 3 3 2 2 Communication with the binary signals 3 4 3 2 3 V 8 V 34 communication sequence 3 12 ...

Page 7: ...1221 Some options can be added when the FAX unit is installed or to extend the FAX functions P 1 9 1 5 Options The external keyboard GJ 1040 is necessary for the installation of the FAX unit GD 1220 1221 Be sure to use the FAX unit and the equipment only in the following combinations GD 1220 GD 1221 Remarks e STUDIO165 205 Available N A e STUDIO167 207 237 Available Available The system firmware v...

Page 8: ...tive scanning area Standard mode For NAD model Horizontal scanning Max 280 mm Ledger width Vertical scanning Max 432 mm Ledger length For MJD AUD ASD SAD TWD and CND models Horizontal scanning Max 297 mm A3 width Vertical scanning Max 420 mm A3 length Long original mode For NAD model Horizontal scanning Max 280 mm Ledger width Vertical scanning Max 1000 mm For MJD AUD ASD SAD TWD and CND models Ho...

Page 9: ... dBm to 8 dBm The setting can be changed by 1 dB Input level 43 dBm to 0 dBm Level 55 dBm or lower cannot be detected Specifications of the communication mode High speed mode Toshiba original procedure mode G3 mode ECM Horizontal scanning den sity 8 dots mm 16 dots mm Same as on the left Same as on the left Vertical scanning density 3 85 lines mm 7 7 lines mm 15 4 lines mm Same as on the left Same...

Page 10: ...e printing area Unit mm inch Paper size Dimension width x length Printing area A5 R 148 x 210 143 x 204 5 B5 R 182 x 257 177 x 251 5 B5 257 x 182 252 x 176 5 A4 R 210 x 297 205 x 291 5 A4 297 x 210 292 x 204 5 B4 257 x 364 252 x 358 5 A3 297 x 420 292 x 414 5 FOLIO 210 x 330 205 x 324 5 ST R 139 7 x 216 5 5 x 8 5 134 7 x 210 5 LT R 216 x 279 4 8 5 x 11 211 x 273 9 LT 279 4 x 216 11 x 8 5 274 4 x 2...

Page 11: ...ng List printing Laser recording on plain paper Recording is performed on fixed sizes of paper Ledger Legal Letter Letter R Statement State ment R Computer A4 A4 R to NAD model or A3 A4 A4 R A5 R B4 FOLIO Letter Letter R to MJD AUD ASD SAD TWD CND models using a laser beam printer Halftone system Photographic images are clearly recorded by the 256 grayscales using the error diffusion method High r...

Page 12: ...ic time period and all day 24 hour operation on selected days The feature can be activated and deactivated by using a 4 digit security code Memory transmission Allows you to dial the remote party while scanning the original in memory The original page data is cleared as the sending of each page is completed Therefore the memory is utilized effectively for transmissions A maximum of 100 jobs of mem...

Page 13: ...e time of transmission account codes will identify when for whom and to whom a particular facsimile message was sent Department code Permits assigning 99 department codes to control access and track activity These codes are set up beforehand and must be used to access machine functions Separator page function GD 1220 1221 have the feature which divide print jobs received original using separator p...

Page 14: ...he specified positions following the Unpacking Setup Instruction Accessory Qty Operator s manual for facsimile function except TW EU 1 pc Modular cord 2 m 1 pc Unpacking instruction 1 set Parts Qty Fax unit 1 pc SG3 label 1 pc FCC Part 68 label U S A NA only 1 pc IC label Canada NA only 1 pc DTS label EU EU only 1 pc Teleprompt label New Zealand AU only 1 pc Notice to users label New Zealand AU on...

Page 15: ...hen the FAX unit is installed The external keyboard GJ 1040 is necessary for the installation of the FAX unit GD 1220 1221 Option Function Model Platen Cover Holds originals KA 1640PC Automatic Document Feeder ADF Feeds originals MR 2017 Reversing Automatic Document Feeder RADF Feeds originals MR 3019 External Keyboard Various dialings GJ 1040 08 08 ...

Page 16: ...ghts reserved SPECIFICATIONS AND OUTLINE OF SYSTEM 1 10 1 6 System List Fig 1 1 Platen Cover KA 1640PC Automatic Document Feeder ADF MR 2017 Reversing Automatic Document Feeder RADF MR 3019 External Keyboard GJ 1040 Fax Kit GD 1220 1221 NA EU AU TW 08 08 ...

Page 17: ...ON All rights reserved GD 1220 1221 SPECIFICATIONS AND OUTLINE OF SYSTEM 1 11 1 1 7 Units and Components Fig 1 2 Fig 1 3 Fig 1 4 Original scale Scanning area Power switch Original glass Control panel External keyboard Toner cartridge ...

Page 18: ...reserved SPECIFICATIONS AND OUTLINE OF SYSTEM 1 12 1 8 Layout of PC Boards Fig 1 5 Symbol Name Function FAX PWA F FAX 635 GD 1220 PWA F FAX 678 GD 1221 FAX board Controls the FAX function NCU PWA F NCU 631 NCU board Control the line of telephone FAX NCU 08 08 ...

Page 19: ...ed GD 1220 1221 LSU RELATED FUNCTIONS 2 1 2 2 LSU RELATED FUNCTIONS 2 1 Recording paper size The following recording paper sizes can be used For NAD model LD LG LT LT R ST R COMP A4 A4 R For MJD AUD ASD SAD TWD CND models A3 A4 A4 R A5 R B4 FOLIO LT LT R ...

Page 20: ...AD model Unit mm inch Paper size Size Horizontal x Vertical Effective recording area LD 279 x 432 11 x 17 275 x 424 10 8 x 16 7 LG 216 x 356 8 5 x 14 212 x 348 8 3 x 13 7 LT 279 x 216 11 x 8 5 275 x 208 10 8 x 8 2 LT R 216 x 279 8 5 x 11 212 x 271 8 3 x 10 7 ST R 140 x 216 5 5 x 8 5 136 x 208 5 4 x 8 2 COMP 257 x 356 10 125 x 14 253 2 x 348 9 97 x 13 7 A4 297 x 210 293 x 202 A4 R 210 x 297 206 x 2...

Page 21: ...izontal x Vertical Effective recording range A3 297 x 420 293 x 412 A4 297 x 210 293 x 202 A4 R 210 x 297 206 x 289 A5 R 148 x 210 144 x 202 B4 257 x 364 253 x 356 FOLIO 210 x 330 206 x 322 LT 279 x 216 11 x 8 5 275 x 208 10 8 x 8 2 LT R 216 x 279 8 5 x 11 212 x 271 8 3 x 10 7 2 mm 0 08 inch 4 mm 0 16 inch Effective recording area Feed direction 4 mm 0 16 inch 2 mm 0 08 inch ...

Page 22: ...TOSHIBA TEC CORPORATION All rights reserved LSU RELATED FUNCTIONS 2 4 2 3 Print mode The machine provides various print modes to meet various requests from users such as applicable recording paper types recording methods etc ...

Page 23: ...able it selects recording paper for printing according to the set mode The mode is set by using Func 15 bit 3 1 Automatic reduction mode Func 15 bit 3 0 Default Selects recording paper on which the received document can be printed and prints on it 2 Reduction OFF mode Func 15 bit 3 1 Selects recording paper on which the received document can be printed in a full size 2 4 2 Print algorithm A recept...

Page 24: ... bottom Discard Function setting by user Vertical reduction Function setting by user Discard parameter Func 15 bit 6 7 Vertical reduction print Divided print Start YES YES Full size print Fraction discard print Receive FAX Within effective recording area NO Fraction discard ON Within fraction discard length range Vertical reduction ON γ within max reduce ratio Calculate reduce ratio γ from actual ...

Page 25: ... part discarded When the length of the received document in the feed direction exceeds the discard parameter range and is within the reduction range of the maximum reduce ratio vertical reduction print takes place When it is not within the reduction range of the maximum reduce ratio divided print takes place The discard extra takes preference over the vertical reduction print Fig 2 2 If the length...

Page 26: ...io settings of 95 90 86 80 83 and 73 are valid When the option for vertical reduction print is OFF When the length of the received document in the feed direction exceeds the effective recording area divided print takes place 3 Divided print When received data cannot be recorded on one sheet even if reception reduction and reception dis card are carried out the recorded data is divided in the verti...

Page 27: ...hose sheets the received document is rotated by 270 degrees before being printed The rotation function is performed after discard extra reduction or dividing processing The rotation function is valid for received documents of A4 LT A5 and ST R sizes 6 Printing with no recording paper When recording paper has run out during printing printing takes place on another printable recording paper starting...

Page 28: ...printed on each page but RTI is printed on the first page only in the case of divided print ON or OFF of RTI is possible by means of the user setting Default OFF RTI is created for the LT or A4 R width When printing RTI on A5 B5 and ST R smaller than those sheets the information to be printed is reduced to a printable length LT size or up Fig 2 5 A5 B5 ST R Fig 2 6 ...

Page 29: ... be printed on one page with a max reduce ratio of 75 is selected The recording paper length of A4 is 297 mm the recording paper length of B4 is 364 mm and the recording paper length of A3 is 420 mm Therefore an A3 paper range covering 390 mm is selected After an A3 range is selected recording paper is selected according to the priority in Table 2 followed by printing Table 1 Selection of recordin...

Page 30: ... 3 LG LD LD 2 LT R 1 LT R 1 LT 3 4 A4 R LG 2 3 LT R LT 1 3 LT 1 3 LG 5 A4 3 A4 LT 3 LG 1 LG 1 A4 R 6 COMP 2 A4 R 3 A4 R A4 R 1 A4 R 1 A4 3 7 LD 2 COMP 2 3 A4 3 A4 1 3 A4 1 3 COMP 2 8 ST R 1 ST R 1 3 ST R 1 ST R 1 ST R 1 LD 2 Recording paper range A4 R B4 A3 A4 A5 FOLIO B5 Priority of recording paper 1 A4 R B4 A3 A4 A5 R 3 FOLIO B4 2 A4 3 A3 2 B4 1 A4 R 3 A4 R B4 2 A4 2 3 FOLIO A4 R 1 A4 R 1 A3 A4 ...

Page 31: ...direction 3 Rotation processing Recording paper range LT long COMP long LD long Priority of recording paper 1 LD 2 LD 2 LD 2 COMP 2 COMP COMP 1 3 LT R LT R 1 LT R 1 4 LT 3 LT 1 3 LT 1 3 5 LG LG 1 LG 1 6 A4 R A4 R 1 A4 R 1 7 A4 3 A4 1 3 A4 1 3 8 ST R 1 ST R 1 ST R 1 Recording paper range A4 long B4 long A3 long Priority of recording paper 1 A3 2 A3 2 A3 2 B4 2 B4 B4 1 3 A4 R A4 R 1 A4 R 1 4 A4 3 A4...

Page 32: ...he first recording paper size declared as it is 2 If a document has been received with recording paper of a larger size empty Declare the maximum value of the remaining recording paper or the attached drawer Conform to the setting of Func 8 bit 4 3 If the drawer has been pulled out Assume A4 if none of the drawers is left 4 If all paper has run out When the recording paper width capacity is record...

Page 33: ...ompletion of printout is assumed and no printout is performed again 4 The feed length of a received document is not limited That is printing is performed even if the received document has several lines for printing However if the top lines are less than 5 lines no printing takes place This also applies to multiple pages in divided print 5 Paper of the same size is present in multiple drawers print...

Page 35: ...MMUNICATION CONTROL 3 1 Circuit Connection and Procedure to Change Mode 3 1 1 Dial call up transmission to a telephone circuit START END Detecting a calling signal Detecting an off hook signal DC circuit closed After detecting the dial tone or 3 3 seconds elapsed Selection signal sent out Standby state NO NO YES YES ...

Page 36: ... 3 Procedure to select the transmission mode Communication mode Toshiba original procedure ECM G3 Telephone circuit 1 This step is only checked when the other side machine has CRP2 CRP1 or when the trans mission is started by the CRP calling The first transmission to the other side with CRP1 only is performed in the ECM mode YES YES YES NO NO 1 START ECM communication Communication using the Toshi...

Page 37: ...d in the binary and tonal procedures Circuit control signals 1 This signal can be sent manually Signal form CED Called station identification Indicates that the sender is a FAX machine in the automatic called mode 1 CNG Calling tone Indicates that the sender is a FAX machine in the automatic calling mode 1 Signal name Signal form Signal form CED f 2100 15 Hz t 2 6 4 0 sec CNG f 1100 38 Hz t 0 5 se...

Page 38: ...d with the binary procedure as follows 1 Binary procedure Transmission and reception in the Toshiba original procedure G3 modes Mode change is possible only for the original set manually Transmtter Receiver Mode change possible Image signal Image signal Image signal Informing that there is the next page CED CFR MCF MCF MCF NSF CSI DIS NSS TSI DCS NSF CSI DIS NSS TSI DCS TCF EOM Training CFR TCF MP...

Page 39: ...ved image data the receiving station informs the sending station of the occurrence of the error and the sending station sends the image data again Transmtter Receiver Image signal Image signal Image signal retransmitted Image signal 256 frames received Error occurred Only error frame retransmitted Page 1 completed Page 2 completed CED NSF CSI DIS NSS TSI DCS Training TCF CFR MCF MCF MCF PPS MPS PP...

Page 40: ... the next page or mode changes by pressing the CLEAR STOP button If the CLEAR STOP button is pressed anytime except during the transmission of the image data DCN is forcibly sent to terminate the communication To cancel the job during the memory transmission or the polling transmission job press the JOB STATUS button on the External Keyboard select the transmission job to cancel and then press the...

Page 41: ...etc DCS Digital Command Signal Commands to transmit using the standard facility which is selected corresponding to DIS or DTC SUB Sub address Indicates that the FIF information is a sub address in the domain on the call in side SEP Select Polling Indicates that the FIF information is a sub address for the polling mode PWD Password Indicates that the FIF information is a password for the polling mo...

Page 42: ...RNR Receive Not Ready Informs that the FAX is not in the receivable state ECM mode PPR Partial Page Request Informs that a part of page ECM block has not been received correctly The number of the frame needs to be corrected is informed by the FIF EC mode PPS Partial Page Signal Informs that a part of page ECM block or one page has been transmitted EC mode CTC Continue to Correct Replies to the 4th...

Page 43: ...me Also establishes the frame synchronization A Address field Informs the address C Control field Informs if this frame is the last one in this procedure FCF FAX control field Informs the type of the binary signal FIF FAX information field Informs FAX information such as the functions FCS Frame check sequence Checks if there was any error in the transmission from A to FIF Format of F A and C When ...

Page 44: ...0 0 0 0 0 1 DTC 1 0 0 0 0 0 0 1 DCS x 1 0 0 0 0 0 1 SUB x 1 0 0 0 0 1 1 SEP 1 0 0 0 0 1 0 1 PWD Rx 1 0 0 0 0 0 1 1 PWD Tx x 1 0 0 0 1 0 1 CFR x 0 1 0 0 0 0 1 FTT x 0 1 0 0 0 1 0 EOM x 1 1 1 0 0 0 1 MPS x 1 1 1 0 0 1 0 EOP x 1 1 1 0 1 0 0 MCF x 0 1 1 0 0 0 1 RTN x 0 1 1 0 0 1 0 PIP x 0 1 1 0 1 0 1 PIN x 0 1 1 0 1 0 0 PRI EOM x 1 1 1 1 0 0 1 PRI MPS x 1 1 1 1 0 1 0 PRI EOP x 1 1 1 1 1 0 0 DCN x 1 0 ...

Page 45: ...follow When the receiving side detects an error in the TCF signal it transmits an FTT signal to the transmitting side to request the retraining When there is no error the receiv ing side transmits a CFR signal The TCF signal transmits all zeros for 1 5 seconds at the same modem speed as that for the training signal Alternation of ABAB Scrambled binary data 1 Segment 1 Segment 2 Segment 3 Segment 4...

Page 46: ...bps 9 6 kbps 7 2 kbps 4 8 kbps 2 4 kbps The modulating speed baud rate 4 can be selected from 2 400 3 000 3 200 symbol sec man datory or 2 743 2 800 3 429 symbol sec option The data rate can be set more accurately than the conventional modem Notes 1 ECM is used in the V 34 procedure If the setting for the ECM transmission reception of the user data is set to Not performed the V 8 procedure is not ...

Page 47: ... information about the modem capa bility is exchanged the receiver determines the modulation speed based on the result of reception of the probing signal which was sent by the transmitter To determine the image transmission speed the transmitter sends a training signal The optimum image transmission speed is determined according to the training signal received The pre FAX transmission which is the...

Page 48: ... a FAX machine in the auto matic calling mode Call Menu signal CM Mainly indicates an available modulation method such as V 21 V 27ter V 29 V 17 V 34 etc Modulated by V 21 L 1 Transmission rate 300 bps CM terminator CJ Indicates the detection of the JM signal or the termination of CM signal Modulated by V 21 L 1 Transmission rate 300 bps Call Indicator signal CI Indicates the general commu nicatio...

Page 49: ...0 Hz tone sig nal B is a signal that shifts the phase B 180 Tone B B Line probing signal L1 L1 Tone signal to analyze the line characteristics by probing Probing is to examine the line characteristics Tone signal between 150 Hz and 3 750 Hz in units of 150 Hz Line probing signal L2 L2 Signal name Abbreviation Function Remarks INFO sequence INFO0a Informs the modem capability such as the modulating...

Page 50: ...n this phase Transmitter receiver Signal name Abbreviation Function Remarks S signal S Short training S is a signal made as the result of phase transition of S S signal S PP signal PP Used by the modem of the receiver to train the equalizer TRN signal TRN Used by the receiver to deter mine the transmission rate Signal name Abbreviation Function Remarks PPh signal PPh Used by the modem of the other...

Page 51: ...selects the available mode from the received NSF and specifies the mode for the reception Transmitting Subscriber ID TSI Informs the telephone number of the transmitter Digital Command Signal DCS Specifies the mode that can be used for the communica tion 1 Declares to switch to the high speed procedure 1 is sent continuously Signal name Abbreviation Function Remarks Non Standard Facilities NSF Inf...

Page 52: ... data Image data are sent Transmitter Signal name Abbreviation Function Remarks S signal S Short training S is a signal that makes a transition from phase S S signal S PP signal PP Used by the modem of the receiver to train the equalizer B1 sequence B1 Scrambled data frame to be sent when the startup process is completed Signal name Abbreviation Function Remarks Image data Image data Encoded image...

Page 53: ...g Sh signal Sh ALT signal ALT E sequence E End of procedure signal PPS EOP The transmission of one page is completed Flag flags Maintains the synchroniza tion 7E H Disconnection signal DCN Informs to disconnect the line Signal name Abbreviation Function Remarks Sh signal Sh Short training Sh signal Sh ALT signal ALT E sequence E Flag flags Maintains the synchroniza tion 7E H Message confirmation M...

Page 54: ...rtant signals in the procedure Late start The receiver cannot detect CM signal while it is sending the ANSam signal Therefore it sends a DIS signal to inform the availability of V 8 support The transmitter sends a CI signal that causes the receiver to send another ANSam signal which makes the receiver move to the V 8 procedure Transmitter Receiver Line closed DIS cannot be recognized ...

Page 55: ...1221 DIALING COMMUNICATION CONTROL 3 21 3 Multi page sequence In the same manner as the T 30 procedure the transmitter sends a PPS MPS signal after send ing the image data The receiver sends an MCF signal and moves to the next page transmission Transmitter Receiver ...

Page 56: ...reserved DIALING COMMUNICATION CONTROL 3 22 Mode change The transmitter and receiver send a PPS EOM signal and an MCF signal respectively Then the receiver and transmitter send a DIS signal and a DCS signal respectively to change the mode Transmitter Receiver ...

Page 57: ...ATION CONTROL 3 23 3 Change of the image transmission speed by the receiver The receiver sends a PPh signal responding to an Sh signal sent from the transmitter Then the image transmission speed is determined according to the MPh sequence sent from the both modems Transmitter Receiver ...

Page 58: ...NTROL 3 24 Change of the image transmission speed by the transmitter The transmitter sends a PPh signal after sending the image data The receiver returns a PPh sig nal Then the image transmission speed is determined according to the MPh sequence sent from the both modems Transmitter Receiver ...

Page 59: ...andset When the operator has learned that the caller is sending a FAX he has to per form the manual reception operation 3 3 3 FAX mode This mode is selected when the telephone circuit is used only for FAX communication When the FAX mode is selected and a calling signal comes from the exchange the FAX reception operation starts automatically without ringing the telephone ringer In the FAX mode a ca...

Page 61: ...HIBA TEC CORPORATION All rights reserved GD 1220 1221 ELECTRICAL CIRCUITS 4 1 4 4 ELECTRICAL CIRCUITS 4 1 Configuration Fig 4 1 GD 1220 1221 Speaker SoC ASIC MAIN board FAX board V 34 MODEM Analog SW NCU board 08 08 ...

Page 62: ...s It con trols switching of the line path generates the dial pulses detects the line current and ring signal and monitors the line NA TW models Fig 4 2 0 1 0 1 IC53 IC52 T1 RLY2 CML relay CNG signal detection circuit Line External telephone CN10 CN11 CN9 CML ANSDET TXOUT RXIN REVB REVA CI LD a2 b2 Lb La NCU board Line current detection circuit IC51 Analog switch IC53 IC52 AG Ring signal detection ...

Page 63: ...Relay DB1 NCU board Lb La a2 b2 CN3 Line External telephone Line current detection circuit IC5 Analog switch IC3 Analog switch Ring signal detection circuit CNG signal detection circuit Dial pulse generation circuit DC consumption circuit AG IC6 IC6 IC4 T1 IC4 0 1 0 1 CN4 FAX board CI ANSDET RLADJ1 RLADJ2 TXOUT LD ATT3DB CML REVB REVA RXIN ...

Page 64: ...l or ATT3DB1 signal goes HIGH the analog switch is turned ON Turning ON the CML relay and analog switch allow the MODEM to be connected to the line Values in are GD 1221 in case that the descriptions vary between GD 1220 and GD 1221 Signal Name Type Active Description Destination CML1 O H Line 1 CML Relay Control Signal RLY2 IC51 ATT3DB1 O H Line 1 Attenuator Control Signal IC51 C5 R4 NCU board CN...

Page 65: ... switched according to the states of the RLADJ11 and RLADJ21 signals Turning ON the CML relay and analog switch allow the MODEM to be connected to the line Values in are GD 1221 in case that the descriptions vary between GD 1220 and GD 1221 Signal Name Type Active Description Destination CML1 O H Line 1 CML Relay Control Signal RLY3 IC3 ATT3DB1 O H Line 1 Attenuator Control Signal IC3 RLADJ11 21 O...

Page 66: ...l become HIGH to connect the line to the MODEM side To generate the dial pulse the ASIC makes the LD1 signal become HIGH to turn ON Q53 This allows the photo coupler to come on and the current flows through the DB1 to send the dial pulses to the line Signal Name Type Active Description Destination LD1 O H Line 1 Dial Pulse Generation Signal Q53 CML1 LD1 3 4 4 3 1 2 AG Q51 CN10 CN11 Lb La Line 0 1 ...

Page 67: ...e line to the MODEM side To generate the dial pulses the ASIC makes the LD1 signal become HIGH to turn ON Q6 This allows the photocou pler to come on and the current flows through the line for sending a dial attempt Signal Name Type Active Description Destination LD1 O H Line 1 Dial Pulse Generation Signal Q6 T1 AG CML1 LD1 3 4 AG CN3 Lb La 0 1 0 1 10 8 3 5 1 2 6 4 12 9 4 1 12V RLY3 CML relay 4 3 ...

Page 68: ...flows through the line and the photocoupler is repeatedly turned ON OFF This allows the REVA1 and REVB1 to be the pulse signals and input to the ASIC then the dial tone is detected When the handset is lifted from the external telephone current also flows through the line and the pho tocoupler is turned ON OFF then the off hook state is detected Signal Name Type Active Description Destination REVA1...

Page 69: ...rent flowing through the line When a dial tone is input from the telephone line current flows through the line The line current detec tion IC sends REVA1 and REVB1 to the ASIC as pulse signals This allows a dial tone to be detected Signal Name Type Active Description Destination REVA1 I Line 1 Current Detection Signal IC23 REVB1 I Current Reverse Line 1 Current Detection Signal IC23 CN3 Lb R26 Lin...

Page 70: ...ect the CI detection circuit to the telephone line When a ring signal is input from the telephone line the photocoupler is repeatedly turned ON OFF This allows the CI1 signal to become a pulse signal and input to the ASIC on the MAIN board thereby detecting the ring signal Signal Name Type Active Description Destination CI1 I Line 1 CI Detect Signal IC23 CN10 Lb La 0 1 0 1 12V RLY2 CML relay CML1 ...

Page 71: ...rcuit to the line When a ring signal is input from the telephone line the photocoupler is repeatedly turned ON OFF This allows Q5 to be turned ON OFF and the CI1 signal to become a pulse signal and input to the ASIC on the MAIN board thereby detecting the ring signal Signal Name Type Active Description Destination CI1 I Line 1 CI Detection Signal IC23 CN3 Lb La Line 0 1 0 10 3 12 1 4 9 1 12V RLY3 ...

Page 72: ... 10 RING TONE 23 11 CML1 27 ATT3DB1 62 SP SP Speaker IC10 Analog switch IC10 IC9 Analog switch AG SG T1 IC53 IC52 AG CN9 CN252 0 1 0 8 12 1 4 9 0 1 0 1 0 1 IC51 Analog switch RLY2 CML relay FAX board AG Q51 12V R273 R31 R272 R30 R59 R71 R67 R271 R29 R270 R32 R268 R35 R267 R33 R266 R36 R37 IC53 25 RING SPKCLK 12 2 32 29 28 29 25 26 IC2 MODEM CN264 R66 R68 IC23 ASIC IC23 ASIC IC53 SoC CN5 MAIN board...

Page 73: ... transmission and reception the ASIC makes the CML1 signal become HIGH to switch the analog switch and connect the line to the MODEM side For the line path switching control refer to P 4 4 4 2 2 Line path switching control circuit The relation between the signal levels and monitoring signals is as follows Monitoring signal TONESEL RING TONE LINE Monitor LOW HIGH Ringer Alarm LOW SPVOL0 3 5 3 SPVOL...

Page 74: ...ound volume is as follows The monitoring signal whose volume is controlled by IC10 is amplified by the OP amplifier IC17 then output to the speaker Values in are GD 1221 in case that the descriptions vary between GD 1220 and GD 1221 Sound volume SPVOL2 SPVOL1 SPVOL0 Max 7 LOW LOW LOW 6 LOW LOW HIGH 5 LOW HIGH LOW 4 LOW HIGH HIGH 3 HIGH LOW LOW 2 HIGH LOW HIGH Min 1 HIGH HIGH LOW Silent 0 HIGH HIGH...

Page 79: ...ual transmission Monitor dialing Direct dialing with the digital keys Phone book dialing Delayed transmission Multi transmission Redialing Recording paper size Recording paper size How to change the recording paper size Automatic manual reception How to switch the automatic and manual reception How the machine works and how to operate it when a FAX is received in these modes Other functions Memory...

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