Main Control Pcb - Muratec MFX-2050 Field Engineering Manual

2.5 Main Control PCB

The main control PCB controls the operations of all machine functions.
Jumper JP1 on the main control PCB is used for battery back up of the SRAM. All user programmed
data and internal memory switch settings are held in SRAM. Removing JP1 will initialize the SRAM.
If the power is turned off, the battery will provide up to five years of back up when fully charged.
Note: JP1 should remain in the "ON" position at all times.
Memory (FLASH MEMORY, SRAM, SDRAM)
FLASH MEMORY - - - The FLASH MEMORY contains all program instructions for unit operation.
SRAM - - - The SRAM, which is backed-up by a lithium battery is used to store user programmed
information.
SDRAM - - - The SDRAM is used for buffer, which is backed-up by a battery is used to store memo-
rized documents.
Note: Turning parameters for Color(R,G,B) and Gray mode are stored in the EEPROM(IC42). When
the PCB MAIN is replaced, the EEPROM on malfunction PCB should be replaced to the new
PCB.
CCFL INVERTER
CCD
CCD PCB
FBS
MOTOR
ADF
MOTOR
+24V,
+5V,+3.3V
POWER SUPPLY
UNIT
NCU PCB
TONE RXA
+24V,+12V,AREF
SDRAM
+24V
IMAGE
PROCESS
MFP
ENGINE
MOTOR
CONTROL
PRINTER
CONTROL
AC
PRINTER
UNIT
Main control PCB block diagram
2-13
PANEL
CPU
TXA
MONITOR
MODEM
CONTROL
CPU
FLASH
MEMORY
SRAM
SDRAM
MAIN CONTROL PCB
+24V,
H.V.POWER
SUPPLY UNIT
KEY
PANAEL PCB B
DISPLAY
PANAEL PCB A
USB
Lithium
SDRAM
Extention Memory
Ni-MH
CENECTOR-B PCB