Epson Scan 2500 service manual Epson Stylus Scan Revision a

EPSON Stylus Scan 2500 Revision A

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The System & Scanner Block

The System & Scanner Block is all of the ICs that handle image data from the scanner. Also this block handles all control/communication signals sent to and from the Control Panel unit as well as any installed options.

The Printer Block

The Printer Block is all the ICs that handle print data and communication data to and from the print mechanism. The print data can come through the USB or parallel port, and communication can be with the print mechanism, System & Scanner Block, or host. One example of communication data from the System & Scanner Block would be a paper feed signal generated when the user presses the Paper Feed button.

The Local Copy Block

The Local Copy Block receives scanned data from the System & Scanner Block, removes the background color of the paper according to the local copy setting, performs image processing to improve quality, converts color from RGB to CMYK using the color matching table, and sends the modified data to the Printer Block.

The USB hub

There are actually two USB interfaces (one for each IC block) on this model plus the USB hub. The hub receives incoming signals or data and determines which IC block to send the data to.

Operating Principles Electrical Circuit Operating Principles 59