Main Circuit (Video Controller); Main Component In The Main Circuit Board - Epson EPL N2700 Service Manual

EPL-N2700

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
Operating Principles

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
CPU
ASIC
Memory
Others
Electrical Circuit Operating Principles.
Name (Location) Functions
• 64-bit CPU
(Internal operational frequency: 166.7 MH)
VR4310 (IC9)
• Clock wavelength: 66.58912MHz
• Memory DMA control
• Panel - Host interface
E05B57EA (IC14)
• PGI - RIT - Engine interface
• EIC
8Mbit Flash ROM-DIMM
• Code
C215PROG (CN14)
• Local language
• Expansion ROM
32Mbit
ROM (IC7, 8)
• Font
8MB SDRAM
SDRAM (IC4, 20)
• Various buffers
Optional SD-RAM slot (168-pin)
(CN8)
• Expansion SDRAM
128Kbit EEPROM (serial type)
X25128 (IC12)
• Stores printer settings.
Reset IC
M51953 (IC13)
• Reset sat power on.
59SC36 (IC405) Network EEPROM
LM3411 (IC18) Regulator IC
Revision A
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