EPL-N2700 Revision A
Operating Principles Electrical Circuit Operating Principles. 78
2.2.2 Main Circuit (Video Controller)
Data sent from the host PC is input to the main circuit via an interface or
network board. The C269MAIN, the main circuit of the printer, converts
data from the PC into raster data to generate video signals. The video
signals turn on/off the laser diode on the printhead to form latent images
on the PC drum.
Figure 2-34. Main Circuit Block Diagram
2.2.2.1 Main Component in the Main Circuit Board
The following table lists the main components on the main circuit board.
Table 2-3. Main Components in the Main Circuit Board
Item Name (Location) Functions
CPU VR4310 (IC9)
• 64-bit CPU
(Internal operational frequency: 166.7 MH)
• Clock wavelength: 66.58912MHz
ASIC E05B57EA (IC14)
• Memory DMA control
• Panel - Host interface
• PGI - RIT - Engine interface
•EIC
Memory
C215PROG (CN14)
8Mbit Flash ROM-DIMM
•Code
• Local language
• Expansion ROM
ROM (IC7, 8)
32Mbit
• Font
SDRAM (IC4, 20)
8MB SDRAM
• Various buffers
(CN8)
Optional SD-RAM slot (168-pin)
• Expansion SDRAM
X25128 (IC12)
128Kbit EEPROM (serial type)
• Stores printer settings.
Others
M51953 (IC13)
Reset IC
• Reset sat power on.
59SC36 (IC405) Network EEPROM
LM3411 (IC18) Regulator IC
