Brother HL-1870N - Main PCB Block Diagram

CHAPTER 3 THEORY OF OPERATION
3-2
1.2 Main PCB Block Diagram
Fig. 3-2 shows the block diagram of the main PCB of the HL-1850 and the HL-1870N printers.
Reset Circuit
Program + Font ROM
10 Mbytes
RAM
(HL-1650: 8.0 Mbytes)
(HL-1670N: 16 Mbytes)
Option RAM (DIMM)
(max. 128Mbytes)
EEPROM (8192 x 8 bits)
CPU Core
(MB86834)
A S I C
Oscillator (48MHz)
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
Network Program
(2.0 Mbytes)
PCI Bus Control
Network Board
To PC
or Hub
(Option for HL-1650)
Oscillator 33.3MHz
Fig. 3-2
HL-1850
HL-1870N