Main Pcb Block Diagram - Brother HL-1070 Service Manual

1.2

Main PCB Block Diagram

Fig. 2.2 shows the block diagram of the main PCB.
Reset Circuit
Program + Font ROM
(8Mbytes)
Flash Memory
(1Mbytes)
RAM
(4Mbytes)
Option RAM (SIMM)
(Max. 32Mbytes)
Option Serial I/O
(RS232C & RS422A)
EEPROM (512 x 8bits)
Motor Driver
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CPU Core
MB86831PFV
BUS INT
To Panel Sensor PCB
Fig. 2.2
II-2
A S I C
Oscillator (33.333333MHz)
Address Decoder
DRAM Control
Timer
FIFO
DATA EXTENSION
Parallel I/O
USB I/O
Software Support
EEPROM I/O
Engine Control I/O
To PC
To PC