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NovaJet 500/630/700 Series Service Manual
The gate array contains the hardware logic for jet firing, monitoring changes in the Carriage Assembly position, controlling DMA through the parallel port, and generating the PWM (Pulse Width Modulation) waveforms for the servo controller.
The gate array is a Xilinx device. It is a static
Memory Circuits
Memory is used to retain large amounts of information. This informa- tion is stored in the device memory in the form of binary bits.
Printer memory consists of Flash EEPROM, DRAM, and EEPROM.
Maximum installable memory is as follows:
DRAM = 128 MB
Flash EEPROM = 1 MB
Serial EEPROM = 1KB
Flash EEPROM
Flash EEPROM is Electrically Erasable, Programmable, Read Only Memory used to store instructions and data constants which the microprocessor can access and interpret, with no loss of information when power is off.
Theory of Operation |