Brother HL-1040 manual Main PCB Block Diagram HL-820/1020, Shows the block diagram of the main PCB

1.2Main PCB Block Diagram

HL-820/1020

Fig. 2-4 shows the block diagram of the main PCB.

A S I C

Reset Circuit

Program + Font ROM

512 Kbytes

RAM

(2.0 Mbytes)

EEPROM (128 8 bits)

Motor Driver

CPU Core
(MC68EC000)
BUS	INT

Oscillator (15.3MHz)

Address Decoder

DRAM Control

Timer

FIFO
DATA EXTENSION
CDCC Parallel I/O	To PC
Soft Support

EEPROM I/O

Engine Control I/O

To Panel Sensor PCB

Fig. 2-4

II-4