EPSON Stylus Scan 2500 Revision A
Operating Principles General 34
2.1 GeneralThe main components of the EPSON Stylus Scan 2500 are the printer
mechanism, scanner mechanism, and the following circuit boards
Main: B102 Main Board
Power Supply: B102 PSB/PSE Board
Panel: B102 PNL Board
2.2 Printer Mechanism OperationLike previous EPSON Ink Jet printers such as the Stylus Color 740, the
printer mechanism of the EPSON Stylus Scan 2500 does not have an
exclusive mechanism to switch fr om paper feeding to pumping and b ack.
Instead, this c ontrol is done by th e rotat ional direc t i o n of the pap er feed/
pump motor and also depends on the position of the carriage.
The printhead combines the black and CMY heads in one unit. The
following indicate the nozzle configurations of these 3 models.
Black Nozzles: 144 nozzles (120 dpi x 3 rows in staggered)
CMY Nozzles: 48 nozzles/colors (120 dpi x 1 row)
Figure 2-1 in the in the right column shows the outline of the prin ter
mechanism.
Motor Types and Corresponding Functions
Motor Type Function For details
see
CR Motor Stepping Used to drive the carriage. page 38
PF Motor Stepping
• Drives the ASF to feed paper into
paper path
• Drives paper feed rollers at variable
speeds
• Drives the CR Lock lever (as
described on page44)
• Drives pump unit to absorb ink
page40