Main Pcb Block Diagram - Brother MFC-8220 Service Manual

CHAPTER 3 THEORY OF OPERATION
1.2

Main PCB Block Diagram

Fig. 3-2 shows the block diagram of the main PCB.
Reset Circuit
Program + Font ROM
1MB, 4MB, 8MB
Network Program
(1.5 MB)
STRAGE (0.5 MB)
RAM
4MB, 8MB, 16MB
RAM (DIMM) (max. 128MB)
EEPROM
512 x 8 bit, 8192 x 8 bit
CIS unit
CPU Core
(SPARClite 133MHz)
BUS
To Engine PCB
Scanner Controller
Oscillator 66.6MHz
INT
Address Decoder
DRAM Control
CDCC Parallel I/O
Oscillator 12MHz
Engine Control I/O
PCI Bus Control
Fig. 3-2
3-2
A S I C
Timer
FIFO
USB I/O
Soft Support
EEPROM I/O
To PC
To PC