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2-10
602E52970
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 and the E.M. (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
Modem
I/O channel
controller
Image
processor
to NCU
board
to console
board
Custom
component
ASIC
Step motor
driver
Step motor
driver
256 kB
EPROM
8 kB
static
memory
512 kB
dynamic
memory
to print
head
to print
head driver
to carriage
motor
to paper
and
scanning
motor
to the head
clearing
E.M.
Fig. 2-10 Block diagram of the motherboard
to contact
sensor
Telephone
network
Handset
Summary of Contents for DFC155
Page 2: ...DFC155 DWC155c SERVICE MANUAL Part Number 602E52970...
Page 88: ...602E52970 6 3 Fig 6 1 Fig 6 2...
Page 133: ...Spare parts catalogue REF PART DESCRIPTION 1 602E52970 DFC155 DWC155c...
Page 135: ...Spare parts catalogue REF PART DESCRIPTION 3 602E52970 ASSEMBLY DFC155 DWC155c...
Page 150: ...Spare parts catalogue 18 REF Part DESCRIPTION 602E52970 PART NUMBER INDEX DFC155 DWC155c...