Canon MultiPASS C5000 Service Manual page 94

Part
6.2 Circuit Board Components
a) System control section
The system controller is made up of the following components, and controls tbc entire fax
a-l) MPU (Micro Processor Unit) (IC 201)
The main functions of lbe NIX' pPD7043:3GJ-16.3EB MPU are as follows
16 bit CPU
l
24 bit address bus
l
8 bit data bus
l
DMA control
l
Am converter
l
Serial intcrfacc
l
Software CODEC
l
Interrupt control unit
l
a-2) System controller (IC 401)
The system controller is a gate array for controlling MPIJ peripheral devices. The main
functions of the system controller are as fullows:
Printer resolution conversion (Ultra-smoothing)
l
This IC converts facsimile data of horizontal rrsolution of 8 dots/mm and vertical
resolution of 3.86 or 7.7 lines/mm to print data of 360 dpi and 360 dpi, respectively.
BJ printer interface
l
O P C N T scrinl interface (Contams document sensor and drxumcnt edge scnsm signals)
l
. DRAIWSRAM controller
Controls DRAM/SRAM rcadhrritc and renewal.
l
l
Dctcction of document edgr FPIX~L' and ink detwtion SE~SOL
l
a-3) RTC (Real Time Clock) IC (IC 203)
t h e dntr nnd lime.
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