Main Pcb Block Diagram - Brother 1240 Service Manual

CHAPTER 3 THEORY OF OPERATION
1.2

Main PCB Block Diagram

HL-1030/1240
Fig. 3-4 shows the block diagram of the main PCB of the HL-1030/1240 printer.
Reset Circuit
Program + Font ROM
1.0 Mbytes
RAM
(2.0 Mbytes)
EEPROM (128
CPU Core
(MB86833)
BUS
8 bits)
To Engine PCB
A S I C
Oscillator (32.7MHz)
INT
Address Decoder
DRAM Control
CDCC Parallel I/O
USB I/O (HL-1240 only)
Soft Support
EEPROM I/O
Engine Control I/O
Fig. 3-4
3-4
Timer
FIFO
To PC
To PC