Brother International HL 1240 Service Manual - Page 42
Fig. 3-4 shows the block diagram of the main PCB of the HL-1250 printer.
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CHAPTER 3 THEORY OF OPERATION HL-1250 Fig. 3-4 shows the block diagram of the main PCB of the HL-1250 printer. A S I C Reset Circuit CPU Core (MB86832) BUS INT Oscillator (32.7MHz) Program + Font ROM 4.0 Mbytes RAM (4.0 Mbytes) Option RAM (SIMM) (max. 32Mbytes) Address Decoder DRAM Control Timer FIFO CDCC Parallel I/O Option Serial I/O (RS232C & RS422A) USB I/O Soft Support To PC To PC EEPROM (512 x 8 bits) EEPROM I/O Engine Control I/O To Engine PCB Fig. 3-4 3-4
CHAPTER 3
THEORY OF OPERATION
3-4
Fig. 3-4 shows the block diagram of the main PCB of the HL-1250 printer.
Reset Circuit
Program + Font ROM
4.0 Mbytes
RAM
(4.0 Mbytes)
Option RAM (SIMM)
(max. 32Mbytes)
Option Serial I/O
(RS232C & RS422A)
EEPROM (512 x 8 bits)
CPU Core
(MB86832)
A
S
I
C
Oscillator (32.7MHz)
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
Fig. 3-4
HL-1250