Brother International HL-720 Service Manual - Page 104
Main PCB Block Diagram, Fig. 2.2, Fig. 2.2 shows a block diagram of the main PCB.
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1.2 Main PCB Block Diagram Fig. 2.2 shows a block diagram of the main PCB. Reset Circuit CPU Core (R3041) BUS INT A S I C Oscillator (4MHz) Program + Font ROM 4 Mbytes RAM (1.0 Mbytes) Option RAM (SIMM) (max.32 Mbytes) Address Decoder DRAM Control Timer FIFO DATA EXTENSION Option Serial I/O (RS232C & RS422A) CDCC Parallel I/O Soft Support EEPROM (512 x8 bits) EEPROM I/O Motor Driver Engine Control I/O To PC To Panel Sensor PCB Fig. 2.2 II-2
II-2
1.2
Main PCB Block Diagram
Fig. 2.2 shows a block diagram of the main PCB.
Reset Circuit
Program + Font ROM
4 Mbytes
RAM
(1.0 Mbytes)
Option RAM (SIMM)
(max.32 Mbytes)
Option Serial I/O
(RS232C & RS422A)
EEPROM (512 x8 bits)
CPU Core
(R3041)
A
S
I
C
Oscillator (4MHz)
Address Decoder
DRAM Control
Timer
FIFO
DATA EXTENSION
CDCC Parallel I/O
Soft Support
EEPROM I/O
Engine Control
I/O
Motor Driver
To Panel Sensor PCB
BUS
INT
To PC
Fig. 2.2