Epson STYLUS Scan 2000 Service Manual page 39

EPSON Stylus Scan 2000
MULTI-FEED PREVENTION MECHANISM
Like the Stylus COLOR 740 ASF, the ASF built in the Stylus Scan has the
multiple-paper-feeding-prevention mechanism to provide accurate and
consistent paper feeding. This mechanism prevents a sheet of paper from
falling from the paper set position into the paper path. A paper return lever
in the mechanism pushes paper that may have fallen off back onto the
hopper. After this motion is completed, the LD roller starts loading paper.
The multiple-paper-feeding-prevention operation is described in the
following steps.
1. When the printer power is turned on, the ASF/Pump motor rotates
counterclockwise to detect ASF home position. Then the motor rotates
clockwise specified steps to set the LD roller and paper return lever to their
proper positions. (See "Standby State" in Figure 2-9.)
2. When the paper loading signal is sent from the PC or the Load/Eject button
is pressed, the PF motor turns counterclockwise to let the LD roller load
paper. (See "Paper Pick Up State" in Figure 2-9.)
Operating Principles
Figure 2-9. Multiple Paper Loading Prevention Mechanism (right side view)
Printer Mechanism Operation
3. Due to the design of the ASF, the LD roller loses friction on the paper and
stops at the point where the paper is fed by the PF roller. (See "PF Roller
Paper Feed State" in Figure 2-9.)
4. When the next print signal is sent or the Load/Eject button is again
pressed, the PF motor rotates clockwise a specified number of steps to set
the LD roller and the paper return lever in place. (See "Standby State" in
Figure 2-9.)
NOTE: If no print signal is sent for a predetermined number of
seconds in step 4, the LD roller and the paper return lever
automatically return to the standby state.
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