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CHAPTER 3 THEORY OF OPERATION
3-6
Fig. 3-6 shows the block diagram of the main PCB of the HL-1270N printer.
Reset Circuit
Program + Font ROM
4.0 Mbytes
RAM
(4.0 Mbytes)
Option RAM (SIMM)
(max. 32Mbytes)
EEPROM (4096 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
Flash ROM
(2.0 Mbytes)
PCI Bus Control
Network Board
To PC
or Hub
Fig. 3-6
HL-1270N