Gestetner A193 Service Manual page 580

PCBs
10. PCBs
10.1 FCU
G4
CPU BUS
Flash ROM
(2MB)
FCU
Bus Interface
Parallel Interface
Serial Interface
The FCU (Facsimile Control Unit) controls fax communication, the video
interface to the base copier's engine, energy saver mode, and fax options.
1. SCP (System Control Processor)
CPU
•
Data compression and reconstruction (DCR)
•
MMR + raw data compression for SAF storage (DCMMR)
•
DMA control
•
Clock generation
•
DRAM backup control
•
Ringing signal/tone detection
•
SM
Function Feature
Upgrade Expander
Card 2M/4M
SRAM
(128kB)
Monitor
Speaker
HDD
Interface
Upper
DRAM
SCP
(2.5MB)
DMA BUS
R144EFXL
Modem
Analog Circuit
NCU
2-26
Page
Memory
HDD Card
Lower Right
VIF
Saver
CPU
A194D516.wmf
(A639)