Toshiba GD-1220, GD-1221 Monitoring signal, Line Monitor, LOW High, Ringer/Alarm, Low

Page 73

EU/AU/AS/C models

NCU board

RLY3

CML relay

							IC6
	4	Lb	1	5	T1	1	2				1
	4	Lb	4
			0
Line	CN3		1	8				IC3
	CN3		1	8						IC4
	3	La	9					Analog		IC4		CN4
			0					Analog	6	7	2
			0					switch	6	7	2
								switch
		+12V			AG	IC6	R11 1
			1	12	5	7	R11 1	1	15		6
			1	12			2	0	15		6
							2	0			3
											3
							13	1	14
								0	14
								0
								11	10
					Q4
					AG

FAX board

	1	TXOUT1
CN252	2	RXIN1
	6
	3

28,29

[25,26]

IC2

32

[29] MODEM

3

IC9

Analog

switch

13

[4]15

R273

14[R31]

[2]

R272

15[R30]

[5]

R271

12[R29]

[1]

		R270
	1	[R32]
IC10	[12]

R268

Analog 5 [R35]

switch [15]

	R267
2	[R33]
[14]

12 RING 25

[2][SPKCLK]

9,10 TONESEL 59

11 RING/TONE 23

ATT3DB1 62

CML1 27

SPVOL0 58

SPVOL1 57

SPVOL2 24

CN5

MAIN board

	25	A5		IC53
				IC53

				SoC
CN5	59	152


	23	153
	62	142		IC23
	27	144
	58	151		ASIC
	58	151
	57	150
	24	149

Speaker

						IC10
SP+		CN264		1		5	3 3
SP-		CN264		2
						SG

R266

[R36]

[ 4 ] [R37] 13

11AG

Fig. 4-13

The line monitor circuit consists of the CML relay (NA/TW: RLY2, EU/AU/AS/C: RLY3), analog switch

(NA/TW: IC51, EU/AU/AS/C: IC3), analog switches (IC9, IC10) on the FAX board, ASIC (IC23) and SoC (IC53) on the MAIN board, and other peripheral devices. It switches the telephone line path using the analog switch and monitors the line status and ringer signal in the FAX transmission and reception using the speaker connected to CN503 on the FAX board. It also switches the analog switch to output a buzzer tone from the speaker.

The signal to be monitored is selected by switching the analog switch (IC9) according to TONESEL sig- nal and RING/TONE signal which are output from the ASIC.

To monitor the line during the transmission and reception, the ASIC makes the CML1 signal become HIGH to switch the analog switch and connect the line to the MODEM side.

For the line path switching control, refer to

P. 4-4 "4.2.2 Line path switching control circuit".

The relation between the signal levels and monitoring signals is as follows.

Monitoring signal	TONESEL	RING/TONE

LINE Monitor	LOW	HIGH

Ringer/Alarm	-	LOW

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

4 - 13

08/08

Image 73

Contents GD-1220/1221 Page Transportation/Installation Vorsicht Important Service Parts for SafetyContents 2006 2008 Toshiba TEC Corporation All rights reserved GD-1220 GD-1221 Remarks FAX OptionsSTUDIO165/205 Available STUDIO167/207/237 System firmware versionSpecifications Transmission system DBm to -8 dBm The setting can be changed by 1 dBEmbedded 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 Layout of PC Boards Symbol Name FunctionFAX PWA-F-NCU-631Recording paper size LSU-RELATED FunctionsSize Horizontal x Vertical Effective recording area Effective recording areaInch Feed direction Mm 0.16 inch Effective recording area For MJD, AUD, ASD, SAD, TWD, and CND models Unit mm inchSize 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 Judgment parameter Reception print flowchart Start Receive FAXBit Discard parameter Discard printingVertical reduction print Similar reduction print RTI Scanning For MJD, AUD, ASD, SAD, TWD, CND modelsST-R Comp Scanning widthRecording paper range For MJD, AUD, ASD, SAD, TWD, and CND modelsRecording paper range A4-R Comp *2 Comp *1 Recording paper range LT long Comp long LD longRecording paper range A4 long B4 long A3 long Folio Folio *1Error processing Order Drawer Limitations on reception printLSU-RELATED Functions Dial call-up transmission to a telephone circuit Circuit Connection and Procedure to Change ModeYES Standby stateProcedure to select the transmission mode Selection of the communication modeCommunication mode Toshiba original procedure Telephone circuitCircuit control signals Signaling System Diagram and Signal FormsThis signal can be sent manually Signal form Signal name Signal formImage signal Communication with the binary signalsMode change is possible only for the original set manually ReceiverFrames received Error occurred Only error frame retransmitted 1 completed 2 completedCFR CED NsfcsidisMCF Binary signals PIN PIPPRI-EOM PRI-MPSFCF 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 Hz and 3,750 Hz in units Tone signal between150 Hz Frequency transmission CapabilityALT TRNReceives an NSF sent from Maintains the synchroniza 7E H TionTransmitter ReceiverScrambled data frame to be Image data Image data are sent. TransmitterIs completed Encoded image data Turn off Scrambled 1 is sent forPPS-EOP Short training SignalTransmission 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 TEL mode FAX Automatic SwitchingFAX mode General functionsDIALING/COMMUNICATION Control GD-1220/1221 ConfigurationDescription of Circuits ConfigurationEU/AU/AS/C models Signal Name Type Active Description Destination Line path switching control circuitCML1 ATT3DB1IC3 RLY3, IC3IC5 Dial pulse generation circuit Line 1 Dial Pulse Generation Signal Q53Line 1 Dial Pulse Generation Signal Line Reverse Current Detection Signal IC23 Line Current Detection Signal IC23Line current detection circuit REVA1Current 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 circuitRinger/Alarm Monitoring signalLine Monitor LOW HighSound 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

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