Main Pcb Block Diagram - Brother HL 5030 - B/W Laser Printer Service Manual

CHAPTER 3 THEORY OF OPERATION
1.2

Main PCB Block Diagram

Fig. 3-2 shows the block diagram of the main PCB. (HL-5030/5040/5050/5070N)
Reset Circuit
Program + Font ROM
HL-5030:1MB
HL-5040:4MB
HL-5050/5070N:8MB
Network Program
(HL-5070N only)(1.5 MB)
STORAGE (0.5 MB)
RAM
HL-5030:4MB
HL-5040:8MB
HL-5050/5070N:16MB
RAM (DIMM)
(max. 128MB)
Option for HL-5040/5050/5070N
EEPROM
HL-5030/5040/5050:512 x 8 bit
HL-5070N:8192 x 8 bit
To PC
or Hub
CPU Core
(SPARClite 133MHz)
BUS
To Engine PCB
Network Controller
(HL-5070N only)
Oscillator 25MHz
(HL-5070N only)
Oscillator 66.6MHz
INT
Address Decoder
DRAM Control
CDCC Parallel I/O
(HL-5040/5050/5070N only)
Oscillator 12MHz
EEPROM I/O
Engine Control I/O
PCI Bus Control
Fig. 3-2
3-2
A S I C
Timer
FIFO
USB I/O
Soft Support
To PC
To PC