Main Pcb (Video Controller Pcb; Outline - Brother HL-2400C Service Manual

2.3

Main PCB (Video Controller PCB)

2.3.1

Outline

The Main PCB consists of the circuits which perform the following functions;
Receive the printing data from the computer.
Convert the received data to the bitmap data such as characters or graphics.
Control the engine and send the generated bitmap data as a video signal.
The control panel is controlled by communicating with the engine CPU to display LCD
messages, light the LEDs and display the button status, etc.
The power for the Main PCB is supplied from the engine through the engine interface
connector.
<Main PCB Block Diagram>
+5V
LS245
PCMCIA x2
LS245
MIO RELAY
MIO
(CONNECTOR)
BOARD
PCB
RS-232C I/F
ADM202
CDCC I/F
Main PCB
+3.3V
Regurator
CPU
MB86832
(SPARC lite)
ASIC
LS245
MB87F1610
EEPROM
X24C04
4kbit
Fig.4-37
IV-46
MASK ROM
32M mask x2(8MB) 8M x2(2MB) x2Banks
Address
Data
F245
EDO DRAM
16M x8(16MB)
F245
MA,RAS,CAS
SN75C1168
LS07
Flash ROM
SIMM(72pin) 3Slots
(EDO or Fast Page)
96MB max.
Video
HSync
ENGINE I/F
Command, PrReq
VSync, Status,
IReady, KeyStatus
+5V
GND