Epson PowerLite 4100 Operator's Manual page 124

104 Maintenance
If the printer is on, press and hold ON LINE while simultaneously pressing
FORM FEED and LINE FEED.
3. If necessary, check and/or change the Char/Inch setting under PRINT
STYLE in the configuration menu.
Note: Select a preferred characters-per-inch setting, since vertical
alignment varys slightly for different pitches.
4. Select "System Options" in the configuration menu.
5. See the Note below and then select "Vertical Alignment."
Note: Vertical alignment must be set at normal print speed.
As a safety feature, when using "fast pitch" (10 pitch printing),
the printer prints at half speed if the operator access door is
open. To cancel half-speed printing during vertical alignment,
press and hold TOF while the printer prints out the test patterns.
+ +