1.4. OVERALL MACHINE CONTROL
The FCU (Facsimile Control Unit) contains the FCIP (Facsimile Control and
Image Processor), DRAM, SRAM, System ROM, and video processing mem-
ory, and controls the entire system.
The FCIP consists of the following component blocks:
• MDM - Modem• RU8 CPU - Main CPU
• DIP - Digital Image Processor• LIF- Laser Interface
• CKG - Clock Generator• RTC - Real Time Clock
• DCR - Data Compression and Reconstruction
The 256KB DRAM contains the SAF memory, ECM buffer memory, and work
area.
A 512 KB (4 Mbit) EPROM is used for the system ROM.
Note: The LIF (Laser Interface) is the same circuit used for laser fax
machines, adapted for use in thermal fax machines.
Contact
Image
Sensor
Amplifier
System
ROM
(4MEPROM)
System RAM
(SRAM)
DATA/ADDRESS BUS
Video
SRAM
Drivers
Thermal
Head
Thermistor
Tx
and
Rx motors
Operation
Panel
Sensors
Jam Sensor /
Paper End Sensor
Speaker
NCU
Handset
Control Signals
DRAM
Working
RAM
ECM/SAF
Memory
FCIP
MDM
CPU
RU8
DCR CKG DIP LIF
DC-DC
Converter
Amplifier
/ Filter
PSU
RTC
Cutter
FCU
H068D506.wmf
August 7th, 1995 OVERALL MACHINE INFORMATION
OVERALL MACHINE CONTROL
1-9
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