Block Diagram Of The Motherboard - Xerox Document FaxCentre 165c Service Manual

2.3.2 Block Diagram of the Motherboard

The motherboard controls the entire machine by means of a central processing unit
(CPU) which uses special circuits to handle four main functional units: the image
processor (for processing the scanned document), the motors (for activating all the
mechanical parts), the print head (for printing both received and copied documents)
and the modem (for controlling the signals to and from the telephone network).
CPU
I/O channel
controller
Modem
Image
processor
to CCD
board
XEROX DFC165 & DWC 165c Service Manual
256 kB
EPROM
to NCU
board
Telephone
network
Fig. 2-10 Block diagram of the motherboard
8 kB
static
memory
Custom
component
Step motor
ASIC
Step motor
to console
board
512 kB
dynamic
memory
to carriage
driver
to scanner
driver
to ink drain
to the
parallel
port card
PC
to print
head
to print
head
driver
motor
to paper
motor
motor
motor
2-11