SERVICE MANUAL

FACSIMILE

GD-1220/1221

File No. SME060017B0

R060121B2200-TTEC

Ver02_2008-08

CONTENTS

1

2

Be sure to use the FAX unit and the equipment only in the following combinations.

1 - 1

08/08

1.2Specifications

1)Main system

-Type

Desktop type transceiver

-Operation

Transmission Manual/Automatic

Reception Manual/Automatic

2) Scanner

<Scanning density> [ ]: at rotation transmission

-Horizontal direction

16 lines/mm, 8 lines/mm

[15.4 lines/mm, 7.7 lines/mm, 3.85 lines/mm]

-Vertical direction

15.4 lines/mm, 7.7 lines/mm, 3.85 lines/mm

[16 lines/mm, 8 lines/mm]

-Combination

-Effective 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)

(For MJD, AUD, ASD, SAD, TWD, and CND models) Horizontal scanning: Max. 297 mm (A3 width) Vertical scanning: Max. 1000 mm

Note:

The maximum vertical scanning length is 700 mm when transmission is performed satisfying all of the following conditions. The equipment is in the long original mode. Direct transmission is performed. The original has the same width as of A3 or ledger. The receiving facsimile machine is capable of receiving originals with A4 only.

1 - 2

Communication mode

High-speed mode (Toshiba original procedure mode)

G3 mode

ECM (Error Correction Mode)

Circuit carrier link equalization function

Embedded

Output level

???16 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

1 - 3

4)Recording system

-Recording method

Electrophotographic recording method by LSU (Laser Scanning Unit)

-Resolution

Horizontal density 16 dots/mm

Vertical density 15.4 lines/mm

-Recording paper size and the effective printing area

1 - 4

??? Image memory communication function

Picture data can be stored in the image memory. For a delayed transmission, the picture data cre- ated by scanning Originals is stored in the image memory and to be transmitted at the designated time.

Other memory functions include multi-address transmission, substitute reception, ECM communica- tion, etc.

The memory contents will be retained by a backup battery for up to 2 hours if a power failure occurs. The memory size is 5.7 MB.

??? 75 one touch keys

The remote party???s address data can be registered to a one touch key. Communication options can be registered for each address. Some one touch keys also operate as direct function access keys.

??? 300 abbreviated dial numbers

300 abbreviated dial numbers can be assigned in the range from No. 001 to 999.

1 - 5

08/08

???Alternate number dialing

It is possible to assign two facsimile telephone numbers to one abbreviated dial number or one touch dial key (one as the primary telephone number and the other as an alternate telephone num- ber). The facsimile first dials the primary telephone number, then redials if the line is busy until the redialing limit count is reached. It will then begin to dial the alternate number. (Except for Relay/Mail- box/Confidential/Polling)

???Multi-address transmission function

Transmissions of the same original to multiple addresses (up to 375 addresses) are possible using one operation sequence, in which preset abbreviated dial numbers (300), and one touch dial keys (75) can be used. When the multi-key is specified, key pad dialing of up to 100 locations, is also pos- sible.

???Multi-polling reception

Polling receptions from multiple remote parties (up to 375 parties) are possible using one operation sequence, in which preset abbreviated dial numbers (300), and one touch dial keys (75) can be used. When the multi-key is specified, key pad dialing of up to 100 locations, is also possible.

???Relay transmission request function

The GD-1220/1221 can originate a relay transmission or serve as a relay station in relay transmis- sion transactions.

???Secure RX

Secure RX allows reception to memory to secure Originals during unattended periods. The user can select a specific 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 memory transmission are possible.

???Public fax box

An original can be reserved in image memory to be polled by remote stations multiple times. One of its merits is that any remote station (even one with a non-TOSHIBA facsimile) can poll such originals without a password.

???Program continuous polling

By designating the starting interval, time, and day-of-week, an endless polling can be set. Once set, polling receptions are repeated at the same time on the designated day-of-week.

???Sub-address communication

The GD-1220/1221 support communication applications using sub-address (SUB/SEP/PWD) com- mands conforming to ITU-T. Sub-address communication is possible by keypad dialing, one touch key dialing, and abbreviated dialing using the sub-address settings in Comm. Options.

???Security communication

For transmissions, the facsimile checks if the telephone number of the remote party???s facsimile CSI matches the number dialed on the unit itself. If it matches, the transmission will start. For receptions, the facsimile checks if the telephone number of the remote party???s TSI matches any number assigned to an abbreviated dial number or one touch key. If it matches, the reception will start. Thus transmissions or receptions with any authorized party will be prevented at the earliest stage.

1 - 6

???Communication options

If necessary, the function may be changed and options can be selected for page number, line moni- toring, turnaround polling, ECM communication and security transmission, etc.

???Automatic dialing functions

-Dialing with a time designated

Transmitting a original to a designated party at a designated time.

-Redialing

When an automatic dialing has been performed and the destination party is busy, redialing will be repeated as many times as programmed with a certain time interval also programmed.

???Cover sheet function

This facsimile has a facsimile cover sheet preparation feature built in, allowing the operator to enter the destination name, sender name at the time of the original transmission. This cover sheet also allows image data, such as a company logo, to be included.

???Account code

By entering a different account code for each destination at the 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 page. Also the customer can program the specified paper drawer for this function.

???List output

This allows the operator to print data stored in the memory (reservation list, preset dial number lists, function list, communication journal, transmission report, etc.).

???Power saver mode

This feature turns off virtually all power to minimize power consumption. Only the sub-MPU remains operation sensing for ringing signals, original insertion, or activation of the [ENERGY SAVER] key.

???Sleep mode

Reduces power consumption by cutting off power for the fuser during periods when printing is not expected. The fast warm up time ensures the printer section will be ready before a full page of image data can be received.

???Recovery transmission

Originals that have gone through the redial count limit will not be cleared, but stored for a pro- grammed period of time. Such originals can be recovered to be transmitted again.

???F-code mailbox/relay box communication

Bulletin board F-code mailbox transmissions using ITU-T standard protocol is possible. Permitting confidential communications with any other similarity equipped facsimile made by TOSHIBA or some other company.

1 - 7

08/08

*Apply the each label to the specified positions following the Unpacking/Setup Instruction.

1 - 8

*The external keyboard (GJ-1040) is necessary for the installation of the FAX unit (GD-1220/1221).

1 - 9

08/08

External Keyboard

GJ-1040

Fax Kit

GD-1220/1221

NA/EU/AU/TW

Fig. 1-1

1 - 10

08/08

Control panel

External keyboard

Toner cartridge

Power switch

Fig. 1-2

Fig. 1-3

Fig. 1-4

1 - 11

1.8Layout of PC Boards

FAX

NCU

1 - 12

08/08

2.LSU-RELATED FUNCTIONS

2.1Recording 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

2

2 - 1

2.2Effective recording area

1)Head : 4 mm (0.16 inch)

2)Foot : 4 mm (0.16 inch)

3)Effective Recording Limits:

2 - 2

4 mm (0.16 inch)

Effective recording area

Feed direction

4 mm (0.16 inch)

Fig. 2-1

2 - 3

2.3Print mode

The machine provides various print modes to meet various requests from users, such as applicable recording paper types, recording methods, etc.

2 - 4

2.4Recording paper selection algorithm and print algorithm

2.4.1Recording paper selection algorithm

2.4.2Print algorithm

A reception print image is basically printed on one page. Consequently, the algorithm of reception print is in the order of same size print, discard extra, vertical reduction print, and divided print. (Refer to the reception print flowchart.)

2 - 5

Reception print flowchart

Vertical reduction print

2 - 6

???When the option for discard extra is ON:

When the length of the received document in the feed direction exceeds the effective recording area and the part exceeding one page is within the discard parameter, printing takes place with the exceeding 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.

B: Record data length outside

effective recording area

B

Fig. 2-2

If the length of B is less than the set discard parameter, B is discarded.

???When the option for discard extra is OFF:

The vertical reduction takes preference without performing discard extra print.

2 - 7

[ 2 ] Vertical reduction print

Func. 15 bit 5 permits selecting between ON and OFF of the option for Vertical reduction print. Func. 15 bit 5 = 0 : OFF

Func. 15 bit 5 = 1 : ON (Default)

???When the option for Vertical reduction print is ON:

When the length of the received document in the feed direction exceeds the effective recording area, the feed length is reduced in an appropriate reduce ratio and then the received document is printed on one sheet of recording paper.

The following two patterns of maximum reduce ratio are available according to the setting of Func.

15 bit 1.

Func. 15 bit 1 = 0 : Max. reduce ratio 90 % ??? The reduce ratio settings of 95% and 90 % are valid.

Func. 15 bit 1 = 1 : Max. reduce ratio 73 % ???The reduce ratio 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 vertical direction and printed on two or more sheets with maximum length set up in the equipment, without reduction.

If a long original with length of 216 mm which cannot be recorded on one B4 sheet with the maximum reduction is received, when A4, B4, and A5 paper is loaded in the first, second, and third drawers, respectively, for example, the maximum recording paper (B4) is selected and received data is divided and printed on two or more sheets without reduction. (Refer to P. 2-13 " Table 3 Selection of record- ing paper (Long original)".)

Fig. 2-3

2 - 8

[ 4 ] Similar reduction print

When recording paper of the same size as that of the received document is not available due to running out of paper or no paper is available to cover the received document, the received document is similarly reduced and printed on recording paper smaller than the received document.

A3

Fig. 2-4

[ 5 ] Rotation print

When recording paper of the same size as that of the received document exists but the orientations are different on those 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 from the next page, if available. However, if recording paper has run out in the middle of divided print, reprinting takes place on another recording paper starting from the first one of the divided pages. (The same operation is done when recording paper of the same size is set in a different paper

2 - 9

[ 7 ] RTI

When printing a received document with the RTI setting ON, RTI is 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

2 - 10

Table 1 Selection of recording paper range

For NAD model

For MJD, AUD, ASD, SAD, TWD, CND models

*When there is no recording paper which received data can be printed on one sheet of, the maximum paper loaded in the equipment is selected and data is divided and printed on two or more sheets

2 - 11

Table 2 Selection of recording paper

For NAD model

For MJD, AUD, ASD, SAD, TWD, and CND models

*1 : Similar reduction possible.

*2 : Center printing when printing out to a size larger in the scanning direction.

*3 : Rotation processing.

2 - 12

Table 3 Selection of recording paper (Long original)

For NAD model

*1 : Similar reduction possible.

*2 : Center printing when printing out to a size larger in the scanning direction.

*3 : Rotation processing.

2 - 13

2.5Error processing

If paper has run out or a drawer has been pulled out, follow the procedure described below.

1)If recording paper of a larger size has run out during communication:

For DIS redeclaration in the mode change procedure, declare the 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 recording paper and all paper has run out, assume A4. (Same processing is done when only the recording paper of scan width less than 216 mm is set.)

2 - 14

2.6Limitations on reception print

The following limitations are imposed on reception print.

2 - 15

2 - 16

3.DIALING/COMMUNICATION CONTROL

3.1Circuit Connection and Procedure to Change Mode

3.1.1Dial call-up transmission to a telephone circuit

After detecting the dial tone, or 3.3 seconds elapsed

Selection signal sent out

3 - 1

3.1.2Selection of the communication mode

This machine has three types of communication mode. The mode to be used is determined according to the combination of the types of the circuits and communication and available function of the other side???s machine.

3.1.3Procedure to select the transmission mode

START

*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.)

3 - 2

3.2Signaling System Diagram and Signal Forms

3.2.1Circuit control signals

The following circuit control signals are used in the binary and tonal procedures.

???Circuit control signals

3 - 3

3.2.2Communication with the binary signals

In the Toshiba original procedure/G3 modes, communication is performed 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.

3 - 4

-Transmission and reception in the ECM mode ECM (Error Correction Mode) conforms to T.30.

When an error has occurred to the received image data, the receiving station informs the sending station of the occurrence of the error, and the sending station sends the image data again.

3 - 5

-Cancellation during the transmission

If the [CLEAR/STOP] button is pressed during the direct transmission or memory input, the dis- play to confirm the cancellation appears. The communication is finished normally regardless of the presence/absence of 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 [ ] button on the LCD display.

MCF

DCN

3 - 6

3 - 7

3 - 8

3)Frame structure of binary signals

Each binary signal frame is comprised of the following sequence and fields. However, some binary signals do not have the FIF field inserted.

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 this frame is the last frame, X = 1.

3 - 9

-FCF format of each binary signal

-X = 1 for the station which received DIS.

-X = 0 for the station which received a response signal to DIS.

3 - 10

4)Training

The training is performed in the binary procedure to surely transmit the image signals.

-Training signal

The training signal is transmitted following the DCS signal at the modem speed specified by the DCS signal. Responding to this training signal, the receiving side adjusts the auto-equalizer.

-Format of the training signal 14.4 Kbps, 12 Kbps

-9600 bps, 7200 bps

-4800 bps, 2400 bps

4,800 bps: 923 msec,

2,400 bps: 1158 msec

-TCF signal

An error may occur in the image data if the training is not performed correctly. The transmitting side sends a TCF signal and checks if any error occurs in image data before the image data communication to 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.

3 - 11

3.2.3V.8/V.34 communication sequence

1)Outline

-V.8 is performed as a startup procedure to switch to V.34. V.8 can connect an existing facsimile machine to the equipment using a data modem or other V-series modems. The V.34 modem has a modem circuit previously recommended, allowing it to be also connected to the existing modems while they are upper compatible.

-New technologies such as the pre-emphasis technology *1 and the probing technology *2 are fully used. The pre-emphasis technology *1 not only speeds up the modulation, but also gains the S/N ratio. The probing technology examines the line characteristics and optimizes the modem for the line condition. Therefore, not only do these technologies speed up the transmis- sion momentarily, but also the average speed of the process during the data transmission is increased.

-For V.8 and the pre/post-FAX transmission for V.34, the procedure is speeded up by the full duplex communication.

-Following 14 types of the image transmission speed are available: *3

33.6kbps/31.2 kbps/28.8 kbps/26.4 kbps/24.0 kbps/21.6 kbps/19.2 kbps/16.8 kbps/14.4 kbps/

12.0kbps/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.

*1 A signal is sent while raising the output level in the high-frequency band in which the noise is relatively loud.

*2 Tone signal called ???Probing Tone??? is sent for the receiver to examine the line characteris- tics of the line.

*3 In the ITU-T Recommendation, it is described as ???data rate???. ???Image transmission speed??? is the same as ???data rate???.

*4 In the ITU-T Recommendation, it is described as ???symbol speed???. The ???Symbol rate???, ???Modulating speed???, and ???Baud rate??? are the same thing. This machine cannot realize the speed of 2,743 symbol/sec.

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 performed and the procedure is not switched to V.34. V.17 or lower is selected in this case.

2.When the transmission/reception speed is set to 14.4 kbps or slower, the V.8 procedure is not performed, and V.17 or lower is selected.

3.See ???Late start (P3-20)??? to move to the V. 8/V.34 procedure after starting with the V.21 proce- dure.

4.After the V.34 procedure is started, the fallback for the V.34 procedure is performed. However, the fallback for the V.17 mode or lower mode is not performed.

3 - 12

3 - 13

-Network interaction (Phase 1)

The V.8 procedure is performed as the startup procedure for the V.34 high-speed modem.

In the V.8 procedure, mainly the optimum modulation method (V series modem mode) that can be operated between the transmitter and receiver is determined.

Transmitter

Receiver

*1 V.21 (L) ..........Low frequency channel defined by the V.21 recommendation 1,080??100 Hz (980 Hz: 1, 1,180 Hz: 0)

V.21 (H) ..........High frequency channel defined by the V.21 recommendation 1,750??100 Hz (1,650 Hz: 1, 1,850 Hz: 0)

3 - 14

-Probing/Ranging (Phase 2)

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

Transmitter

3 - 15

-Equalizer and echo canceller training (Phase 3)

Training (adjustment) is performed according to the parameters set in the phase 2 to optimize the filters such as an equalizer.

Transmitter

-Final training (Phase 4)

The settings such as the maximum value for the data rate, selection of the trellis encoder, and data rate which can be supported are made in this phase.

Transmitter/receiver

3 - 16

-Control channel

The conventional T.30 procedure is performed. The transmission rate is 1200 bps.

Receiver

Reference: In the control channel, the frequency of the signals to be sent is different between the transmission and reception. The signal echoed back has never been misidentified as a signal sent from the other side. Therefore, this channel is not influenced by signals echoed back.

3 - 17

-Primary channel

The training is performed according to the parameters set in the phase 4. The transmission rate is 1,200 bps.

Transmitter

-Image data

Image data are sent. Transmitter

3 - 18

-Communication end procedure

This procedure is to terminate the communication. The transmission rate is 1,200 bps. Transmitter

3 - 19

3)Example of protocol

The signals shaded in the following figure are the most important 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)

3 - 20

-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.

3 - 21

-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.

3 - 22

-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

3 - 23

-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

3 - 24

3.3FAX Automatic Switching

3.3.1General functions

There are two types of setting for the FAX Auto-Switching Mode Selection: TEL Mode and FAX Mode.

3.3.2TEL mode

This mode is selected to prioritize telephone communication when the frequency of the fax reception is low. When the TEL mode is selected, the automatic FAX reception function does not work. Therefore, when a calling signal comes from the exchange, the telephone ringer continues ringing until the opera- tor picks up the handset. When the operator has learned that the caller is sending a FAX, he has to per- form the manual reception operation.

3

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 calling number can be set up to 15 calls in the SET FUNCTION (FUNC 14 Bits 7 to 4).

<Method of judging CNG detection>

CNG

???As shown above, after CNG-on detection time T1 (175 ms) and CNG-off detection time T2 (350 ms) have elapsed, and the T1 period has been turned on and then the T2 period off, CNG is determined to have occurred once.

3 - 25

3 - 26

4.ELECTRICAL CIRCUITS

4.1Configuration

4 - 1

08/08

4.2Description of Circuits

4.2.1Configuration

This section describes the function of each circuit.

The NCU board consists of the transformer, relay, analog switch and other peripheral devices. It con- trols switching of the line path, generates the dial pulses, detects the line current and ring signal, and monitors the line.

4 - 2

4 - 3

4.2.2Line path switching control circuit

The line path switching control circuit consists of the CML relay (RLY2) and analog switch (IC51) on the NCU board, the ASIC (IC23) on the MAIN board and the other peripheral devices.

The CML relay is switched according to the CML1 signal output from the ASIC on the MAIN board. When the CML1 signal goes HIGH, Q51 comes on to turn ON the CML relay.

The analog switch is switched according to the CML1 signal and ATT3DB1 signal. When the CML1 sig- nal 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.

4 - 4

08/08

The CML relay is switched according to the CML1 signal output from the ASIC on the MAIN board. When the CML1 signal goes HIGH, Q4 comes on to turn ON the CML relay.

The analog switch (IC3) is switched according to the CML1 signal and ATT3DB1 signal. When the CML1 signal or ATT3DB1 signal goes HIGH, the analog switch is turned ON.

The analog switch (IC5) is switched according to the RLADJ11 and RLADJ12 signals.

The analog switch is 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.

4 - 5

08/08

The dial pulse generation circuit consists of the diode bridge (DB1), photocoupler (PC1), the ASIC (IC23) on the MAIN board and the other peripheral devices. It generates the dial pulses in the FAX transmission and dialing to the outside.

The ASIC makes the CML1 signal 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.

4 - 6

The dial pulse generation circuit consists of the photocoupler (IC1), the ASIC (IC23) on the MAIN board and the other peripheral devices. It generates the dial pulses in the FAX transmission and dialing to the outside.

The ASIC makes the CML1 signal become HIGH to connect the 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.

4 - 7

Fig. 4-8

The line current detection circuit consists of the photocoupler (PC3), ASIC (IC23) on the MAIN board and the other peripheral devices. It detects a dial tone and the hook status of the external telephone from the current flowing through the line.

When a dial tone is input from the telephone line, current 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.

4 - 8

EU/AU/AS/C models

4 - 9

4.2.5CI detection circuit

NA/TW models

Fig. 4-10

The CI detection circuit consists of the photocoupler (PC2), ASIC (IC23) on the MAIN board and the other peripheral devices to detect a ring signal input from the telephone line.

The ASIC makes the CML1 signal become LOW to connect 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.

4 - 10

4 - 11

Fig. 4-12

4 - 12

08/08

Fig. 4-13

The line monitor circuit consists of the CML relay (NA/TW: RLY2, EU/AU/AS/C: RLY3), analog switch

(NA/TW: IC51, EU/AU/AS/C: IC3), analog switches (IC9, IC10) on the FAX board, ASIC (IC23) and SoC (IC53) on the MAIN board, and other peripheral devices. It switches the telephone line path using the analog switch and monitors the line status and ringer signal in the FAX transmission and reception using the speaker connected to CN503 on the FAX board. It also switches the analog switch to output a buzzer tone from the speaker.

The signal to be monitored is selected by switching the analog switch (IC9) according to TONESEL sig- nal and RING/TONE signal which are output from the ASIC.

To monitor the line during the 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.

4 - 13

08/08

The monitoring signal selected by IC9 is input to the analog switch (IC10) to select the output sound volume. The sound volume is selected by switching IC10 according to the SPVOL0-2 signals output from the ASIC and selecting an input resistance for the monitoring signal.

The relation between the signals and sound 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.

4 - 14

08/08

4.3PC Boards

1) PWA-F-FAX-635 (GD-1220)

Fig. 4-14

4 - 15

08/08

2) PWA-F-FAX-678 (GD-1221)

Fig. 4-15

3) PWA-F-NCU-631 (NAD, TWD, SAD)

4 - 16

08/08

4) PWA-F-NCU-631 (MJD, AUD, ASD, CND)

4 - 17

4 - 18

5.INSTALLATION

5.1Explanation to the Users

After installing the FAX unit, explain the following items to the user using the Operator???s Manual. With the underlined items, actually demonstrate the operation.

Items to be explained

??? Switches and control panel

- Summary of the control panel (FAX functions)

- After power is turned OFF, image data are kept in HDD.

- How to operate the polling reception and transmission

- How the multi-polling reception works and how to operate it

??? How to register addresses

- How to register new addresses in the Phone Book

- How to correct or erase the contents of the Phone Book

- Group registration in the phone book for the multi-transmission or multi-polling

??? How to output lists

- How to output the TRANSMISSION JOURNAL and RECEPTION JOURNAL

5 - 1

5 - 2