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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.
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