Brother HL-1030, 1240, 1250 service manual CPU Core Reset Circuit

CHAPTER 3 THEORY OF OPERATION

HL-1270N

Fig. 3-6 shows the block diagram of the main PCB of the HL-1270N printer.

A S I C

	CPU Core
Reset Circuit	(MB86832)
	BUS	INT
Program + Font ROM
4.0 Mbytes
Flash ROM
(2.0 Mbytes)
RAM
(4.0 Mbytes)
Option RAM (SIMM)
(max. 32Mbytes)
EEPROM (4096 x 8 bits)

Oscillator (32.7MHz)

Address Decoder

DRAM Control

Timer

FIFO
CDCC Parallel I/O	To PC
	To PC
USB I/O

Soft Support

EEPROM I/O

Engine Control I/O

To PC or Hub

To Engine PCB

Network Board

Fig. 3-6

PCI Bus Control

3-6