Toshiba GD-1221, GD-1220 service manual Line path switching control circuit, CML1, ATT3DB1

Page 64

4.2.2Line path switching control circuit

NA/TW models

NCU board

R4

C5

FAX board

MAIN board

 

 

 

 

 

 

Q51

 

 

 

 

 

 

 

3

 

 

 

+12V

RLY2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CML relay

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

12

AG

 

 

R67

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

8

T1

 

 

 

R71

 

 

 

 

 

 

4 Lb

9

 

 

 

 

 

 

 

 

 

 

0

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line

CN10

 

 

 

 

 

 

 

 

IC51

9,11

 

 

CN9

 

 

1

 

 

 

 

 

10

 

 

 

3 La

4

 

 

 

 

 

 

 

 

 

 

0

3

 

 

 

 

Analog

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch

 

IC53

 

 

 

 

 

 

 

AG

 

 

3 1

 

 

 

 

 

 

 

 

 

 

4

1

2 1

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

IC53

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

7

R59

1

1

 

IC52

 

 

 

3 a2

 

 

 

 

 

15

6

7

2

 

 

 

 

 

 

 

 

2

0

 

 

 

 

 

 

6

 

 

 

 

 

 

 

CN11

 

 

 

 

 

 

 

 

 

 

 

 

External

 

 

 

 

 

R66

 

13

1

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

telephone

4 b2

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R68

 

 

 

 

 

 

 

 

 

 

 

 

 

Ring signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

detection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 4-4

 

 

 

 

CN262

3

CML1

27

 

6

ATT3DB1

62

CN5

 

 

 

 

1 TXOUT1

28,29

 

 

[25,26]

 

 

 

IC12

2 RXIN1

32

[IC2]

 

 

[29]

MODEM

 

 

 

 

 

CN5

27 144

IC23

62 142 ASIC

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.

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

 

 

 

 

 

 

*Values in [ ] are GD-1221 in case that the descriptions vary between GD-1220 and GD-1221.

GD-1220/1221

© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved

ELECTRICAL CIRCUITS

 

4 - 4

08/08

Page 63 Page 65
Image 64
Page 63 Page 65
Contents GD-1220/1221 Page Transportation/Installation Important Service Parts for Safety VorsichtContents 2006 2008 Toshiba TEC Corporation All rights reserved FAX Options GD-1220 GD-1221 RemarksSTUDIO165/205 Available STUDIO167/207/237 System firmware versionSpecifications DBm to -8 dBm The setting can be changed by 1 dB Transmission systemEmbedded DBm to 0 dBm Level -55 dBm or lower cannot be detectedFolio Dimension width x length Printing areaComp Features Specifications and Outline of System 08/08 Following accessories and parts come with the FAX unit Accessories and PartsAccessory Qty Options Extends the FAX functions when the FAX unit is installedOption Function Model NA/EU/AU/TW System ListADF Radf Units and Components Symbol Name Function Layout of PC BoardsFAX PWA-F-NCU-631LSU-RELATED Functions Recording paper sizeEffective recording area Size Horizontal x Vertical Effective recording areaFor MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inch Inch Feed direction Mm 0.16 inch Effective recording areaSize Horizontal x Vertical Effective recording range 297 x 293 x A4-R 210 x 206 x A5-R 148 x 144 x 257 x 253 xPrint mode Recording paper selection algorithm Recording paper selection algorithm and print algorithmPrint algorithm Reception print flowchart Start Receive FAX Judgment parameterDiscard printing Bit Discard parameterVertical reduction print Similar reduction print RTI For MJD, AUD, ASD, SAD, TWD, CND models ScanningST-R Comp Scanning widthRecording paper range For MJD, AUD, ASD, SAD, TWD, and CND modelsRecording paper range A4-R Recording paper range LT long Comp long LD long Comp *2 Comp *1Recording paper range A4 long B4 long A3 long Folio Folio *1Error processing Limitations on reception print Order DrawerLSU-RELATED Functions Circuit Connection and Procedure to Change Mode Dial call-up transmission to a telephone circuitYES Standby stateSelection of the communication mode Procedure to select the transmission modeCommunication mode Toshiba original procedure Telephone circuitSignaling System Diagram and Signal Forms Circuit control signalsThis signal can be sent manually Signal form Signal name Signal formCommunication with the binary signals Image signalMode change is possible only for the original set manually ReceiverOnly error frame retransmitted 1 completed 2 completed Frames received Error occurredCFR CED NsfcsidisMCF Binary signals PIP PINPRI-EOM PRI-MPSFCF FIF FCS When this frame is the last frame, X =Format FCF format of each binary signal Binary signal Format4800 bps, 2400 bps 9600 bps, 7200 bpsTCF 3 V.8/V.34 communication sequence Standard procedure Transmitter Receiver Line closedSignal name Abbreviation Function Remarks Tone signal between Hz and 3,750 Hz in units150 Hz Frequency transmission CapabilityTRN ALTMaintains the synchroniza 7E H Tion Receives an NSF sent fromTransmitter ReceiverImage data Image data are sent. Transmitter Scrambled data frame to beIs completed Encoded image data Turn off Scrambled 1 is sent forShort training Signal PPS-EOPTransmission of one Is completed Informs to disconnect the lineLine closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control FAX Automatic Switching TEL modeFAX mode General functionsDIALING/COMMUNICATION Control Configuration GD-1220/1221Configuration Description of CircuitsEU/AU/AS/C models Line path switching control circuit Signal Name Type Active Description DestinationCML1 ATT3DB1IC3 RLY3, IC3IC5 Line 1 Dial Pulse Generation Signal Q53 Dial pulse generation circuitLine 1 Dial Pulse Generation Signal Line Current Detection Signal IC23 Line Reverse Current Detection Signal IC23Line current detection circuit REVA1Line 1 Current Detection Signal IC23 Current Reverse Line 1 Current Detection IC23 SignalLine 1 CI Detect Signal IC23 CI detection circuitLine 1 CI Detection Signal IC23 Line monitor circuit FAX boardMonitoring signal Ringer/AlarmLine Monitor LOW HighSound volume PC Boards PWA-F-FAX-635 GD-1220PWA-F-FAX-678 GD-1221 PWA-F-NCU-631 NAD, TWD, SAD PWA-F-NCU-631 MJD, AUD, ASD, CND Electrical Circuits Installation Explanation to the UsersInstallation
Related manuals
Manual 260 pages 43.51 Kb
Top Page Image Contents