Dial pulse generation circuit | Toshiba GD-1221, GD-1220 instruction

4.2.3Dial pulse generation circuit

NA/TW models

		NCU board
				C5	R4
				+12V	RLY2
				+12V
				CML relay
				1		12			Q51	3
									Q51
		4	Lb	9	1	8
		4	Lb	9	0	10			AG
					0	10			AG
Line	CN10						~
Line	CN10	3	La	4	1		DB1
		3	La	4	0	3	-	+
					0	3	-	+		CN9
									+5V	CN9
							~	4	1
							~
									PC1
		3	a2					3	2
External	CN11									4
									Q53	4
telephone		4	b2						Q53
telephone		4	b2
									SG
							Ring signal
							detection
							circuit
								Fig. 4-6

	FAX board						MAIN board

3

CML1 27

27 144

CN262			CN5	CN5	IC23
CN262			CN5	CN5	ASIC
4	LD1	61		61	143

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.

Signal Name	Type	Active	Description	Destination

LD1	O	H	Line 1 Dial Pulse Generation Signal	Q53

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

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Image 66

Toshiba GD-1221, GD-1220 service manual Dial pulse generation circuit, Line 1 Dial Pulse Generation Signal Q53

Contents

GD-1220/1221 Page Transportation/Installation Important Service Parts for Safety Vorsicht Contents 2006 2008 Toshiba TEC Corporation All rights reserved STUDIO165/205 Available STUDIO167/207/237 FAX OptionsGD-1220 GD-1221 Remarks System firmware version Specifications Embedded DBm to -8 dBm The setting can be changed by 1 dBTransmission system DBm to 0 dBm Level -55 dBm or lower cannot be detected Dimension width x length Printing area FolioComp Features Specifications and Outline of System 08/08 Accessories and Parts Following accessories and parts come with the FAX unitAccessory Qty Extends the FAX functions when the FAX unit is installed OptionsOption Function Model System List NA/EU/AU/TWADF Radf Units and Components FAX Symbol Name FunctionLayout of PC Boards PWA-F-NCU-631 LSU-RELATED Functions Recording paper size Effective recording area Size Horizontal x Vertical Effective recording area Size Horizontal x Vertical Effective recording range For MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inchInch Feed direction Mm 0.16 inch Effective recording area 297 x 293 x A4-R 210 x 206 x A5-R 148 x 144 x 257 x 253 x Print mode Recording paper selection algorithm and print algorithm Recording paper selection algorithmPrint algorithm Reception print flowchart Start Receive FAX Judgment parameter Discard printing Bit Discard parameter Vertical reduction print Similar reduction print RTI ST-R Comp For MJD, AUD, ASD, SAD, TWD, CND modelsScanning Scanning width For MJD, AUD, ASD, SAD, TWD, and CND models Recording paper rangeRecording paper range A4-R Recording paper range A4 long B4 long A3 long Recording paper range LT long Comp long LD longComp *2 Comp *1 Folio Folio *1 Error processing Limitations on reception print Order Drawer LSU-RELATED Functions YES Circuit Connection and Procedure to Change ModeDial call-up transmission to a telephone circuit Standby state Communication mode Toshiba original procedure Selection of the communication modeProcedure to select the transmission mode Telephone circuit This signal can be sent manually Signal form Signaling System Diagram and Signal FormsCircuit control signals Signal name Signal form Mode change is possible only for the original set manually Communication with the binary signalsImage signal Receiver Only error frame retransmitted 1 completed 2 completed Frames received Error occurred CED Nsfcsidis CFRMCF Binary signals PRI-EOM PIPPIN PRI-MPS When this frame is the last frame, X = FCF FIF FCSFormat FCF format of each binary signal Binary signal Format 9600 bps, 7200 bps 4800 bps, 2400 bpsTCF 3 V.8/V.34 communication sequence Standard procedure Transmitter Receiver Line closed Signal name Abbreviation Function Remarks 150 Hz Tone signal betweenHz and 3,750 Hz in units Frequency transmission Capability TRN ALT Transmitter Maintains the synchroniza 7E H TionReceives an NSF sent from Receiver Is completed Image data Image data are sent. TransmitterScrambled data frame to be Encoded image data Turn off Scrambled 1 is sent for Transmission of one Is completed Short training SignalPPS-EOP Informs to disconnect the line Line closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control FAX mode FAX Automatic SwitchingTEL mode General functions DIALING/COMMUNICATION Control Configuration GD-1220/1221 Configuration Description of Circuits EU/AU/AS/C models CML1 Line path switching control circuitSignal Name Type Active Description Destination ATT3DB1 RLY3, IC3 IC3IC5 Line 1 Dial Pulse Generation Signal Q53 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Line current detection circuit Line Current Detection Signal IC23Line Reverse Current Detection Signal IC23 REVA1 Line 1 Current Detection Signal IC23 Current Reverse Line 1 Current Detection IC23 Signal Line 1 CI Detect Signal IC23 CI detection circuit Line 1 CI Detection Signal IC23 Line monitor circuit FAX board Line Monitor Monitoring signalRinger/Alarm LOW High Sound volume PC Boards PWA-F-FAX-635 GD-1220 PWA-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 Users Installation