Toshiba GD-1151 Line current detection circuit, REVA1, Line Current Detection Signal IC29 IC26

Page 73

4.2.4Line current detection circuit

NA/TW models

NCU board

FAX board

Line

CN10

4Lb

	R87
	1	8
		PC3
	2	7
C7
	3	6
		PC3
R86	4	5
R86

19

CN9

20

SG

19 REVA1 2

CN501

20 REVB1 3

IC29

[IC26]

ASIC

Fig. 4-11

The line current detection circuit consists of the photocoupler (PC3), ASIC (IC29 [IC26]) on the FAX board and the other peripheral devices. It detects a dial tone and the hook status of the external tele- phone from the current flowing through the line.

When a dial tone is input from the telephone line, current flows through the line and the photocoupler is repeatedly turned ON/OFF. This allows the REVA1 and REVB1 to be the pulse signals and input to the ASIC, then the dial tone is detected.

When the handset is lifted from the external telephone, current also flows through the line and the pho- tocoupler is turned ON/OFF, then the off-hook state is detected.

Signal Name	Type	Active		Description	Destination

REVA1	I	-	Line 1	Current Detection Signal	IC29 [IC26]

REVB1	I	-	Line 1	Reverse Current Detection Signal	IC29 [IC26]

*Values in [ ] are for GD-1151/1201 in case that the descriptions vary between GD-1150/1200 and GD-1151/1201.

4

© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved	GD-1150/1151/1200/1201/1160/1260
	ELECTRICAL CIRCUITS

4 - 11

08/03

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Contents GD-1150/1151/1200/1201/1160/1260 Trademarks STUDIO3511/4511 Model Weight Number of peopleSTUDIO281c/351c/451c Service of Machines Precautions against Static Electricity Page Contents 2003 2008 Toshiba TEC Corporation All rights reserved FAX unit 2nd line for FAX board FAX OptionsOriginal size SpecificationsFolio 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 detectedComp Dimension width x length Printing areaFeatures Specifications and Outline of System Following accessories and parts come with the FAX unit Accessories and PartsQty STUDIO230/280 OptionsSTUDIO281c/351c/451c Option Function ModelSTUDIO202L/203L/232/233/282/283 series STUDIO352/353/452/453GD-1260NA/TW/EU/C GD-1150NA/TW/EU AU/AS/C System ListGD-1150NA/TW/EU Bridge Kit KN-3511 FAX Board GD-1200 Finisher Hanging type e-STUDIO352/353 only MJ-1022 GD-1150NA/TW/EU AU/AS/C/KR Units and Components Layout of PC Boards Symbol Name Function RemarksFAX MDM NCU FAXSTUDIO281c/351c/451c, e-STUDIO352/353/452/453 FAX power board Supplies the power -12V, +24VMDM FAX FAX PWR NCU FAX control board Controls the FAX functionSpecifications and Outline of System LSU-RELATED Functions Recording ModeRecording paper selection algorithm Recording Paper Selection Algorithm and Printing AlgorithmPrinting algorithm ST against A3/B4/A4/LD/LT size originals respectively Discard function Length of B Discard parameter Set value Effective printing lengthOFF A5 , Comp LT, Comp COMP, LD LG/LT, LD ST, Folio B5, Folio B4, A3 A4, B4 B5, B4 A5, A4Setting for the split recording Recording Paper and Function Others Table of the recording paper selection modesPriority User Functions Energy Saver ModeReceiving FAX document, or by Energy SaverMemory Reception 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 formCommunication with the binary signals Mode change is possible only for the original set manually Image signalMode change possible Informing that there is the next ReceiverFrames received Error occurred Only error frame retransmitted 1 completed 2 completedCED Nsfcsidis JOB Status button Cancel buttonCFR MCFBinary 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 Data transmissionALT TRNMaintains the synchroniza 7E H Tion FlagReceives an NSF sent from TransmitterScrambled 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 Flag 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 functionsElectrical Circuits ConfigurationFAX PWR STUDIO202L/203L/232/233/282/283 GD-1151 GD-1260 95C265 4Mbit x MN86064 Description 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 IC29 IC26 Line Current Detection Signal IC29 IC26Line current detection circuit REVA1Current Reverse Line 1 Current Detection IC29 IC26 Signal Line 1 Current Detection Signal IC29 IC26CI detection circuit Line 1 CI Detect Signal IC29 IC26Line 1 CI Detection Signal IC29 IC26 NCU board Line1 Line monitor circuitRinger/Alarm Monitoring signalLine Monitor LOW HighSound volume Relation between the signals and sound volume is as followsPWA-F-FAX-562 / PWA-F-FAX-610 PC BoardsPWA-F-FAX-670 PWA-F-NCU-US-562/PWA-F-NCU-631-US PWA-F-MDM-563 PWA-F-NCU-EU-562/PWA-F-NCU-631-EUPWA-F-MDM-631 PWA-F-FAX-POWER-610PWA-F-FAX-POWER-631 Electrical Circuits Explanation to the Users InstallationInstallation

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