6.2. GENERAL BLOCK DIAGRAMThe following is an outline of each device IC on the digital board. (Refer to 6.2.1 GENERAL BLOCK DIAGRAM(P.146).).1. ASIC (IC501)Composed mainly of an address decoder and a modem control.Controls the general FAX operations.Controls the operation panel I/F.Controls the thermal head I/F and CIS I/F.Performs the image processing.CPU and Real time clockProvides the reset pulse for each of the major ICs.2. ROM (IC502)Contains all of the program instructions on the unit operations.3. Static RAM (IC504)This memory is used mainly for the parameter working in the storage area.4. Dynamic RAM (IC503)This memory is used mainly for the parameter working in the storage area.5. MODEM (IC505)Performs the modulation and the demodulation for FAX communication.6. Read SectionCIS image sensor to read transmitted documents.7. Motor Driver (IC508)Drives the transmission motor and the reception motor.8. Thermal HeadContains heat-emitting elements for dot matrix image printing.9. Analog BoardComposed of ITS circuit and NCU circuit.10. Sensor SectionComposed of a cover open and film end switch, a document set switch, a document top switch, a paper top sensor and a motorposition switch.11. Power Supply Board Switching SectionSupplies +5V and +24V to the unit.145KX-FPC91
