Brother International HL 1230 Service Manual - Page 55
Fig. 3-5 shows the block diagram of the main PCB of the HL-1450 printer.
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CHAPTER 3 THEORY OF OPERATION HL-1450 Fig. 3-5 shows the block diagram of the main PCB of the HL-1450 printer. Reset Circuit CPU Core (MB86832) BUS INT A S I C Oscillator (33.33MHz) Program + Font ROM 8.0 Mbytes RAM (4.0 Mbytes) Option RAM (SIMM) (max. 32Mbytes) Address Decoder DRAM Control Timer FIFO CDCC Parallel I/O USB I/O To PC To PC EEPROM (512 x 8 bits) Soft Support EEPROM I/O Engine Control I/O To Engine PCB Fig. 3-5 3-5
CHAPTER 3
THEORY OF OPERATION
3-5
Fig. 3-5 shows the block diagram of the main PCB of the HL-1450 printer.
Fig. 3-5
HL-1450
Reset Circuit
Program + Font ROM
8.0 Mbytes
RAM
(4.0 Mbytes)
Option RAM (SIMM)
(max. 32Mbytes)
EEPROM (512 x 8 bits)
CPU Core
(MB86832)
A
S
I
C
Oscillator (33.33MHz)
Address Decoder
DRAM Control
Timer
FIFO
CDCC Parallel I/O
Soft Support
EEPROM I/O
Engine Control
I/O
To Engine PCB
BUS
INT
To PC
USB I/O
To PC