Detailed Section Descriptions; Hardware Overview - Ricoh A284 Service Manual

HARDWARE OVERVIEW

2. DETAILED SECTION DESCRIPTIONS

2.1 HARDWARE OVERVIEW
BICU
SCANNER CONTROL
BOARD
- Image Input Circuit -
C P U
U P D 7 0 5 1 0 1 G M
(33.3 MHz)
Flash
D R A M
R O M
(16 MB)
(2 MB)
The scanner controller contains image input and network interface circuits.
The image data from the BICU is compressed in the image input circuit, then the
data goes to the network through the network interface circuit.
Each circuit has a CPU and flash memory IC. The functions of each major
component are as follows.
B359
M B
FIFO
(256 kB)
A S I C
U P D 6 5 8 4 2
D R A M Flash
M e m o r y
S I M M
Card
Slot
Slot
8-4
- Network Interface Circuit -
S R A M
D R A M
(2 MB)
E E P R O M
A S I C
Bridge
DISCII
A G 1 0 0 1 V
Flash
C P U
R O M
M C 6 8 3 4 0 V P
(25.166 MHz) (2 MB)
M A C
A M 7 9 C 9 7 1
P H Y
ICS1892
R J 4 5
Network
A844D500.WMF
SM