Epson PowerLite S4 User Manual page 13

Adjusting the Image Quality
2 Adjust the tracking until the vertical stripes disappear from the
image.
Using the remote control
The tracking value increases or decreases each time a button is
pressed.
3 Press the [Menu] button to exit the configuration menu.
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The image will flash when continuous tracking adjustment is carried out,
but this is normal.
Using the control panel
Adjusting the Sync
If flickering, fuzziness or interference appear in
computer or RGB video images, and this cannot be
fixed using automatic setup, you will need to adjust
the Sync (synchronization) manually using the
following procedure.
1 Select "Signal" from the configuration
menu, and then select "Sync.".
Check the buttons you can use and the operations they perform in the
guide at the bottom of the screen.
Using the remote control
2 Adjust the synchronization until the horizontal noise disappears
from the image.
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Using the control panel