Manuals / Toshiba / Computer Equipment / Fax Machine

Toshiba GD-1220, GD-1221 service manual Line 1 Dial Pulse Generation Signal

Models: GD-1220 GD-1221

1 82

Download 82 pages 10.87 Kb

Page 67

EU/AU/AS/C models

NCU board

+12V RLY3

CML relay

	FAX board						MAIN board

112

+5V

Q4

3

3 CML1 27

27 144

4 Lb 4

1 5

0 3

6 1

AG

IC23

Line

External telephone

CN3

3 La	1	8
3 La	9	10
	0	10

2a2

5b2

IC1

42

Q6

SG

T1

AG

Ring signal

detection

circuit

4

Line path switching circuit

CN4

CN262

4 LD1 61

CN5

CN5

61 143

ASIC

Fig. 4-7

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.

Signal Name	Type	Active	Description	Destination

LD1	O	H	Line 1 Dial Pulse Generation Signal	Q6

© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved	GD-1220/1221
	ELECTRICAL CIRCUITS

4 - 7

Image 67

Toshiba GD-1220, GD-1221 service manual Line 1 Dial Pulse Generation Signal

Contents

GD-1220/1221 Page Transportation/Installation Vorsicht Important Service Parts for SafetyContents 2006 2008 Toshiba TEC Corporation All rights reserved System firmware version FAX OptionsGD-1220 GD-1221 Remarks STUDIO165/205 Available STUDIO167/207/237Specifications DBm to 0 dBm Level -55 dBm or lower cannot be detected DBm to -8 dBm The setting can be changed by 1 dBTransmission system EmbeddedFolio 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 PWA-F-NCU-631 Symbol Name FunctionLayout of PC Boards FAXRecording paper size LSU-RELATED FunctionsSize Horizontal x Vertical Effective recording area Effective recording area297 x 293 x A4-R 210 x 206 x A5-R 148 x 144 x 257 x 253 x For MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inchInch Feed direction Mm 0.16 inch Effective recording area Size Horizontal x Vertical Effective recording rangePrint mode Recording paper selection algorithm Recording paper selection algorithm and print algorithmPrint algorithm Judgment parameter Reception print flowchart Start Receive FAXBit Discard parameter Discard printingVertical reduction print Similar reduction print RTI Scanning width For MJD, AUD, ASD, SAD, TWD, CND modelsScanning ST-R CompRecording paper range For MJD, AUD, ASD, SAD, TWD, and CND modelsRecording paper range A4-R Folio Folio *1 Recording paper range LT long Comp long LD longComp *2 Comp *1 Recording paper range A4 long B4 long A3 longError processing Order Drawer Limitations on reception printLSU-RELATED Functions Standby state Circuit Connection and Procedure to Change ModeDial call-up transmission to a telephone circuit YESTelephone circuit Selection of the communication modeProcedure to select the transmission mode Communication mode Toshiba original procedureSignal name Signal form Signaling System Diagram and Signal FormsCircuit control signals This signal can be sent manually Signal formReceiver Communication with the binary signalsImage signal Mode change is possible only for the original set manuallyFrames received Error occurred Only error frame retransmitted 1 completed 2 completedCFR CED NsfcsidisMCF Binary signals PRI-MPS PIPPIN PRI-EOMFCF FIF FCS When this frame is the last frame, X =Format Binary signal Format FCF format of each binary signal4800 bps, 2400 bps 9600 bps, 7200 bpsTCF 3 V.8/V.34 communication sequence Line closed Standard procedure Transmitter ReceiverSignal name Abbreviation Function Remarks Frequency transmission Capability Tone signal betweenHz and 3,750 Hz in units 150 HzALT TRNReceiver Maintains the synchroniza 7E H TionReceives an NSF sent from TransmitterEncoded image data Turn off Scrambled 1 is sent for Image data Image data are sent. TransmitterScrambled data frame to be Is completedInforms to disconnect the line Short training SignalPPS-EOP Transmission of one Is completedLine closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control General functions FAX Automatic SwitchingTEL mode FAX modeDIALING/COMMUNICATION Control GD-1220/1221 ConfigurationDescription of Circuits ConfigurationEU/AU/AS/C models ATT3DB1 Line path switching control circuitSignal Name Type Active Description Destination CML1IC3 RLY3, IC3IC5 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Q53Line 1 Dial Pulse Generation Signal REVA1 Line Current Detection Signal IC23Line Reverse Current Detection Signal IC23 Line current detection circuitCurrent Reverse Line 1 Current Detection IC23 Signal Line 1 Current Detection Signal IC23CI detection circuit Line 1 CI Detect Signal IC23Line 1 CI Detection Signal IC23 FAX board Line monitor circuitLOW High Monitoring signalRinger/Alarm Line MonitorSound volume PWA-F-FAX-635 GD-1220 PC BoardsPWA-F-FAX-678 GD-1221 PWA-F-NCU-631 NAD, TWD, SAD PWA-F-NCU-631 MJD, AUD, ASD, CND Electrical Circuits Explanation to the Users InstallationInstallation