41309401TH Rev.4 331 /4. R46 Circuit Diagram (OKIOFFICE87)4.1 R46 Circuit Diagram (1/15, 2/15, 3/15)1. Block diagramR46-PCB circuit diagram (1/15, 2/15, 3/15) shown the consists of an input/output gate array IC2(IOGA6), crystal oscillator circuit and reset signal generator.Figure A.19 shown the block diagram of IC2 (IOGA6) and the peripheral circuits.2. Function1) IOGA6 is newly developed LSI for scanning, printing control and provided with a built-inCPU.- IOGA6 contains the following functions:• Scanned data DMA control• Strobe signals control for LED head• Smoothing control for printing data• Interface of the peripheral LSI- CPUCPU controls the following functions in addition to the basic processor.• DMA (Direct Memory Access) control• Interrupt procedure control• A/D converter• Bus state control• Programmable pattern control• 16 bit integrated timer pulse unit (ITU)• Timing pattern control (TPC)• Serial communication interface (SCT)2) Crystal oscillator circuitX1 is 20MHz crystal oscillator. The output wave is fed to the CPU1 through pin 73 and 74.CLK (20MHz) signal output from pin 71 is used as the system clock.Data/Address BusM D-motorPrinter controlOST-EXBuffer 640 bytesDecoding(RLE,TIFF,ACC32)200-300 convertersmoothingVarious SensorIOGA6 1/3IOGA6 2/3IOGA6 3/3LED head300 dpiData/Address Bus High-voltageController High-voltagePower SupplyData/Address Bus Peripheral control1284 controlCS generationI/O portDMA 2chBi-CentroI/FOPE unitSpeaker+5V IC1X120 MHzCLK20 MHzInitial Reset CircuitPOWRDYCPU; SH7034XTALEXTALAddress BusData/Address busCLKClutchFigure A.19 Related Signals of IOGA6
