Brother International HL 1240 Service Manual - Page 41
Main PCB Block Diagram - reset
UPC - 012502600855
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CHAPTER 3 THEORY OF OPERATION 1.2 Main PCB Block Diagram HL-1240 Fig. 3-3 shows the block diagram of the main PCB of the HL-1240 printer. A S I C Reset Circuit CPU Core (MB86833) BUS INT Oscillator (32.7MHz) Program + Font ROM 1.0 Mbytes Address Decoder DRAM Control RAM (2.0 Mbytes) Timer FIFO CDCC Parallel I/O USB I/O To PC To PC EEPROM (128 8 bits) Soft Support EEPROM I/O Engine Control I/O To Engine PCB Fig. 3-3 3-3
CHAPTER 3
THEORY OF OPERATION
3-3
1.2
Main PCB Block Diagram
Fig. 3-3 shows the block diagram of the main PCB of the HL-1240 printer.
Reset Circuit
Program + Font ROM
1.0 Mbytes
RAM
(2.0 Mbytes)
EEPROM (128
8 bits)
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
CPU Core
(MB86833)
BUS
INT
To PC
USB I/O
To PC
Fig. 3-3
HL-1240