Description of Circuits, Configuration | Toshiba GD-1221, GD-1220

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.

NA/TW models
		NCU board
								REVA
								REVB
			Line current			IC53
		Lb	Line current	T1				TXOUT
		Lb	detection	T1				TXOUT
	CN10		detection
Line	CN10		circuit
			circuit

		La			IC51
		La
				IC53	Analog	IC52
				AG	switch			RXIN
					switch
				~
				DB1		IC52
						IC52	CNG signal
			-	+			CNG signal	ANSDET
			-	+			detection	ANSDET
							detection
							circuit
				~
				Dial pulse				LD
				generation				LD
				generation				CN9
		a2		circuit				CN9	FAX board
		a2							FAX board
External	CN11			DC
telephone	CN11	b2		consumption				ATT3DB
		b2		circuit
				circuit
								CML
				1
				0
				1
				0
				RLY2
				CML relay
				Ring signal				CI
				detection				CI
				detection
				circuit
				Fig. 4-2

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

4 - 2

Image 62

Toshiba GD-1221, GD-1220 service manual Description of Circuits, Configuration

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 Comp Dimension width x length Printing areaFolio Features Specifications and Outline of System 08/08 Accessory Qty Accessories and PartsFollowing accessories and parts come with the FAX unit Option Function Model Extends the FAX functions when the FAX unit is installedOptions ADF Radf System ListNA/EU/AU/TW 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 Print algorithm Recording paper selection algorithm and print algorithmRecording paper selection 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 Recording paper range A4-R For MJD, AUD, ASD, SAD, TWD, and CND modelsRecording paper range 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 MCF CED NsfcsidisCFR Binary signals PRI-EOM PIPPIN PRI-MPS Format When this frame is the last frame, X =FCF FIF FCS FCF format of each binary signal Binary signal Format TCF 9600 bps, 7200 bps4800 bps, 2400 bps 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 IC5 RLY3, IC3IC3 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