Pcbs; Fcu - Ricoh FAX2000L Service Manual

30 November, 1999
2.4 PCB
S

2.4.1 FCU

FCU
The FCU (Facsimile Control Unit) board contains the FCIP2 (Facsimile Control and
Image Processor), DRAM, SRAM, Flash ROM, and video processing memory, and
it controls the entire system.FCIP2
• CPU
• Data compression and reconstruction (DCR)
• Digital image processor
• Laser interface
• DMA controller
• Clock generation
• Stepper motor control
• DRAM backup control
• Fusing lamp control
ROM
• 1MB (8 Mbits) flash ROM for system software storage
DRAM
• 2 MB DRAM shared between the Line Buffer (124 KB), ECM Buffer (128 KB),
Page Memory (1156 KB), System RAM (128KB), and SAF memory (512 KB)
SRAM
• 32 KB SRAM for system and user parameter storage, backed up by the
battery on the FCU
Video SRAM
• 8 KB SRAM for video processing
IC Card P o w e r
I/F Pack
G E P C
SYSTEM BUS
Flash
D R A M S R A M
R O M
A F E M o d e m
N C U
Motor
Driver
Energy
Saver
C P U
FCIP2
E X I O
V I D E O
R A M
Operation
Panel
2-39

PCBS

Main
Motor
H545D701.WMF