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Theory of Operation 2-11
NovaJet 800 Series Service Manual
SDRAM
SDRAM is Synchronous Dynamic Random Access Memory, which
provides temporary storage of the microprocessor calculation and input/
output data. It is also a faster type of memory then the Flash
EEPROM. That’s why the printer control program is also copied from
the Flash EEPROM to RAM, where it can be executed faster.
All printers ship with 64 MB of RAM and are upgradable to a maxi-
mum of 256 MB. Additional memory helps to free the host computer
more quickly. Printer memory may be upgraded by installing PC100 (or
faster) 168-pin DIMMs or Dual In-line Memory Modules. The printer
will accept 64 MB, 128 MB or 256MB DIMMs.
Serial EEPROM
Serial EEPROM is an Electrically Erasable, Programmable, Read Only
Memory which provides storage for calibration constants and user
configuration data entered from the host computer.
An 8K bit serial nonvolatile EEPROM stores calibration and configura-
tion information. It retains data while the unit is off.
Stepper Motor Controller
Figure 2-7. Stepper Motor Controller.
The media is driven by a Stepper Motor, which drives the media in a
direction perpendicular to the width of the printer. The media in the
printer can advance forward and backward, depending upon the