Board Descriptions A - 24 OF 5300/5600 Serv Man, P/N 59278301A3.2.5 M17 Circuit Diagram1. Block diagramThe circuit diagram consists of the following function:• IC6 (A/D converter) and amplifier• 30 V/24 V conversion circuit• Connector CN10 that provides an interface between M17 board and CIS (contactimage sensor).Figure A3.2.5 shows the related signals and block diagram of CIS.2. FunctionOne-line picture data is read in the sequence from the scanning unit (CIS) as SIG signal(analog data) to A/D converter (analog/digital converter) of IC6 via amplifier. Afterconversion from analog data to 6-bit digital signal (SDT2 - SDT7) under the control ofIC6, the picture data is sent to EXSEED (scanning control LSI) of IC20. Here, the picturedata undergoes various kinds of picture processings.Sensor interface signal output from EXSEED.• LEDON : LED on/off control signal• PDCK : Scanning sensor drive clock (1.25MHz for ODA/833KHz for INT'L)• MISP : Scanning synchronous signal (2.5 msec)• ADCLK: Sampling clock for A/D converter (1.25MHz for ODA/833KHz for INT'L)Shift register & analog switchesCN1010342, 5, 7-8 V0 VACIS (contact image sensor)M17VLED+5 V-8 V0 VALEDs arrayRod lens arraysensor1728 bit (216 mm)+5 V9681VLED (+24 V)GLEDMISPDCKSIGGLEDMISPPDCK (1.25MHz/833KHz)SIGAmplifierA/D converterAmplifierTR9/TR10TransistorLEDONEXSEEDIC20SDT2 - SDT7IC630 V/24 V conversioncircuit30 V 24 VRelated Signals and Block Diagram of CIS (Figure A3.2.5)
