Lexmark OptraImage 443, Service Manual

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Lexmark Internal Use Only 1-10
1.6.3 1.6.3 1.6.3 1.6.3 System Description System Description System Description System Description
The OptraImage 443 is a duplex scanner which can scan synchronously both top and bottom size in a
document. It includes one main control board, two optical modules, one ADF module and one LCD panel.
1.6.3.1
1.6.3.1 1.6.3.1
1.6.3.1 System Diagram
System Diagram System Diagram
System Diagram
Figure 1.4 shows the system block diagram.
The main control board controls all the modules built up the OptraImage 443. It includes a RISC. ARM7
as the main controller, two Flash Memory as program area and one EDO RAM as working space, one
89C52 for panel control, two ASIC for flatbed and ADF image processing and each have external 32MB
SRDRAM for data processing, two A/D converter for processing flatbed and ADF CCD signals input, two
sets of motor drivers for driving flatbed and ADF motors, two SCSI controller for data interfacing with
host and printer.
The power is an external 24V/2500mA power adapter for the whole system. There are some different
values inside the OptraImage 443:
+24V Power directly comes from the power adapter and used for flatbed and ADF motor.
+12V Power converted from 7812 to supply flatbed and ADF CCD
+5V Power converted from 34063 to supply 89C52, SCSI controller and some 5V logic.
+5V Power converted from 7805 to supply flatbed and ADF A/D converters and all analog circuit.
+3.3V Power converted from LM2576T to supply ARM7, two image processing ASICs and some 3.3V
logics.