Line path switching control circuit, CML1 | Toshiba GD-1221 guide

4.2.2Line path switching control circuit

NA/TW models

NCU board	R4
C5

FAX board

MAIN board

						Q51								3
			+12V	RLY2		Q51
				RLY2

				CML relay										6
														6
			1		12	AG			R67
			1		12	AG
				1	8	T1				R71
		4 Lb	9	1	8	T1
		4 Lb	9	0	10
				0	10
Line	CN10									IC51	9,11			CN9
Line				1						IC51	10
		3 La	4	1							10
		3 La	4	0	3					Analog
				0	3					Analog
										switch		IC53
						AG			3 1			IC53
						AG			3 1		4	1	2 1
										0	4	1	2 1
						IC53				0
						IC53
						5	7	R59	1	1		IC52
		3 a2					7		1	1	15	6	7	2
		3 a2							2	0	15	6	7	2
						6			2	0
	CN11					6
External							R66		13	1
									13	1	14
telephone		4 b2								0	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]
2 RXIN1	32
	[29]	MODEM
		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

Image 64

Toshiba GD-1221 Line path switching control circuit, Signal Name Type Active Description Destination, CML1, ATT3DB1

Contents

GD-1220/1221 Page Transportation/Installation Important Service Parts for Safety Vorsicht Contents 2006 2008 Toshiba TEC Corporation All rights reserved FAX Options GD-1220 GD-1221 RemarksSTUDIO165/205 Available STUDIO167/207/237 System firmware version Specifications 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 detected Folio 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-631 LSU-RELATED Functions Recording paper size Effective recording area Size Horizontal x Vertical Effective recording area For 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 x Print mode Recording paper selection algorithm Recording paper selection algorithm and print algorithmPrint algorithm Reception print flowchart Start Receive FAX Judgment parameter Discard printing Bit Discard parameter Vertical reduction print Similar reduction print RTI For MJD, AUD, ASD, SAD, TWD, CND models ScanningST-R Comp Scanning width Recording 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 *1 Error processing Limitations on reception print Order Drawer LSU-RELATED Functions Circuit Connection and Procedure to Change Mode Dial call-up transmission to a telephone circuitYES Standby state Selection of the communication mode Procedure to select the transmission modeCommunication mode Toshiba original procedure Telephone circuit Signaling System Diagram and Signal Forms Circuit control signalsThis signal can be sent manually Signal form Signal name Signal form Communication with the binary signals Image signalMode change is possible only for the original set manually Receiver Only error frame retransmitted 1 completed 2 completed Frames received Error occurred CFR CED NsfcsidisMCF Binary signals PIP PINPRI-EOM PRI-MPS FCF FIF FCS When this frame is the last frame, X =Format FCF format of each binary signal Binary signal Format 4800 bps, 2400 bps 9600 bps, 7200 bpsTCF 3 V.8/V.34 communication sequence Standard procedure Transmitter Receiver Line closed Signal name Abbreviation Function Remarks Tone signal between Hz and 3,750 Hz in units150 Hz Frequency transmission Capability TRN ALT Maintains the synchroniza 7E H Tion Receives an NSF sent fromTransmitter Receiver Image data Image data are sent. Transmitter Scrambled data frame to beIs completed Encoded image data Turn off Scrambled 1 is sent for Short training Signal PPS-EOPTransmission of one Is completed Informs to disconnect the line Line closed DIS cannot be recognized DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control DIALING/COMMUNICATION Control FAX Automatic Switching TEL modeFAX mode General functions DIALING/COMMUNICATION Control Configuration GD-1220/1221 Configuration Description of Circuits EU/AU/AS/C models Line path switching control circuit Signal Name Type Active Description DestinationCML1 ATT3DB1 IC3 RLY3, IC3IC5 Line 1 Dial Pulse Generation Signal Q53 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Line Current Detection Signal IC23 Line Reverse Current Detection Signal IC23Line current detection circuit 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 Monitoring signal Ringer/AlarmLine Monitor 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