Epson Projector Emp 7900 User Manual

							40
Adjusting the Screen Image
Manually Correcting Keystone Distortion
This projector is equipped with an automatic keystone correction function 
that detects the vertical angle of the projector during projection and 
automatically corrects vertical keystone distortion. If you would like to 
make further fine adjustments after automatic keystone correction has been 
carried out, or if the projector is tilted horizontally, you can carry out 
keystone correction manually.This projector is equipped with the following two keystone correction 
functions. Use whichever function is appropriate for the keystone 
distortion that appears.
 Auto Keystone/H/V-Keystone
Automatic keystone automatically corrects keystone distortion when the 
projected images are vertically distorted.
H/V-Keystone can be used to make fine adjustments to the results of 
automatic keystone correction and to correct horizontal keystone 
distortion.
The keystone correction function lets you easily correct keystone 
distortion that has occurred after moving the projector, simply by using 
buttons on the projectors control panel.
See Automatic keystone correction   p.41
Vertical correction and horizontal correction   p.42
Height Correction   p.43
 Quick Corner:
This correction function is used when both horizontal and vertical 
keystone distortion occurs in the projection area to adjust the projection 
area so that it fits the screen exactly.   p.44
TIP
If the projector is tilted within a range of approximately 30º up or 
down, keystone correction is carried out automatically. If the 
projector is tilted within a range of approximately 40º up or down or 
20º to the left or right, manual keystone correction can be carried out.
However, the applicable angles will become smaller under the 
following conditions.
 If the projector has been tilted both horizontally and vertically
 If an optional projection lens has been fitted
 When the zoom is set to W 
						

							41
Adjusting the Screen Image
When the projector has been tilted vertically, automatic keystone 
correction is carried out so that images with no distortion are projected.
Automatic keystone correction is carried out approximately one second 
after the projector is set up and projection starts. A vertical keystone 
correction gauge appears on the screen while automatic adjustment is in 
progress.
TIP
 The Auto Keystone, H/V-Keystone and Quick Corner 
functions cannot both be used together to correct keystone distortion. 
If you use one function to correct keystone distortion, any correction 
that has been applied using the other function will be cancelled.
 The larger the angle of tilt, the poorer the focus of the contours in 
the projected images will become.
 If a large amount of keystone correction is applied, fine details such 
as text characters and lines may go out of focus.
 Keystone corrections that have been applied using the keystone 
correction functions are memorised even when the projectors power 
is turned off. If you have changed the projection position or angle, 
you will need to repeat the correction procedure.
 H-Keystone and Height cannot be used at the same time.
 When keystone correction is carried out, the projected images will 
become smaller. Use the zoom function to adjust the size of the 
images if necessary.   p.37
 If the text part of the image is blurred after keystone correction is 
carried out, decrease the sharpness setting.   p.73, p.76
Automatic keystone correction
TIP
 Automatic keystone correction is not carried out if Rear Proj. or 
Ceiling in the Advanced1 menu is set to ON, or if the 
projection area has been corrected manually using the Quick 
Corner function.
 If you would like to make further fine adjustments after automatic 
keystone correction has been carried out, or if the projector is tilted 
horizontally, you can carry out keystone correction manually. 
 p.42
 If you do not want automatic keystone correction to be carried out, 
change the Auto Keystone setting in the H/V-Keystone sub-
menu of the Keystone command in the Setting menu to OFF. 
 p.80 
						

							42
Adjusting the Screen Image
Vertical correction and horizontal correction can be carried out using either 
the projectors control panel or the configuration menus. This procedure 
explains how to use the projectors control panel to correct keystone 
distortion.
For adjustment using the configuration menus: - Setting - Keystone - 
H/V-Keystone  p.80
If you use the horizontal correction function when height correction 
adjustment has already been carried out, the height correction adjustment 
will be cancelled.PROCEDUREVertical correction and horizontal correction
TIP
If Quick Corner is selected in the Keystone sub-menu of the 
Setting menu, the Quick Corner correction screen will be 
displayed if you press the [ ], [ ], [ ] or [ ] buttons.   p.44
When carrying out vertical correction and horizontal correction, 
select H/V-Keystone and then make the correction.   p.80
ProjectorProjector If the top of the 
image is elongatedIf the bottom of the 
image is elongated
ProjectorProjector If the left edge of the 
image is elongatedIf the right edge of the 
image is elongated
TIP
If the value displayed in the gauge on the screen stops changing when 
vertical correction and horizontal correction is being carried out, it 
indicates that the limit for vertical correction and horizontal 
correction has been exceeded. Check that the projector has not been 
set up at an angle which exceeds the proper limit. 
						

							43
Adjusting the Screen Image
When Automatic keystone correction and horizontal correction is carried 
out, the height of the projected images will become shorter. Use the height 
correction function to adjust the height of the projection area.
The height correction function is accessible from the configuration menu.
This cannot be set when vertical correction is carried out.PROCEDURE
Press the [Menu] button on either the remote control 
or the projectors control panel. Then select Height 
from the H/V-Keystone sub-item of the Keystone 
command in the Setting menu.
For details, refer to Using the Configuration Menus   p.91
Tilt the [ ] button on the remote control to the left or 
right, or press the [ ] or [ ] buttons on the 
projectors control panel to correct the height while 
viewing the projected images.When the adjustment is complete, press the [Menu] 
button on the remote control or the projectors 
control panel to close the configuration menu.
Height Correction1
[    ]: Select [ ESC ]: Return
[Menu]: Exit
[    ]: Adjust
Video
AudioSettingUsers Logo
Advanced1Reset All About Advanced2 Effect
Auto Keystone
:
Height
:    0
+
-
Keystone
H-Keystone
:
0
+
-
V-Keystone
:32
+
-
ONOFF
2
[    ]: Select Select
[ ESC ]:[ ESC ]: Retur Return
[Men
[Menu]:u]: Exit Exit
[    ]: Adjust Adjust
VideoVideoAudioudioSettingSettingUsers LogoUsers LogoAdvAdvanced1anced1Reset AllReset AllAboutAboutAdvAdvanced2anced2EffEffect
Auto KeystoneAuto Keystone
:
HeightHeight
:  48
+
-
KeystoneKeystone
H-KeystoneH-Keystone
:0
+
-
V-KeystoneV-Keystone
:3232
+
-
ONONOFFOFF
3 
						

							44
Adjusting the Screen Image
Quick Corner correction can be carried out using either the projectors 
control panel or the configuration menus. This procedure explains how to 
use the projectors control panel to correct keystone distortion.
If using the configuration menu: Setting - Keystone - Quick Corner 
 p.80PROCEDURE
Press the [ ], [ ], [ ] or [ ] button on the 
projectors control panel.
The Quick Corner correction screen will be displayed.
Press the [Auto/Enter] button on the projectors 
control panel and then select the corner to be 
corrected on the screen. 
You can also press the [Enter] button on the remote control to 
select the corner.
Correcting Keystone Distortion so that the Projection 
Area Fits the Screen Exactly (Quick Corner)
TIP
If H/V-Keystone is selected in the Keystone sub-menu of the 
Setting menu, the V-Keystone or H-Keystone adjustment gauge 
will be displayed if you press the [ ], [ ], [ ] or [ ] buttons. 
 p.42 
When carrying out Quick Corner correction, select Quick Corner 
and then make the correction.   p.801
[          ]:Adjust[    ]      :Move next[ESC]   :Return (Press 1 second to
reset)
/
2
[          ]:Adjust[    ]      :Move next[ESC]   :Return (Press 1 second to
reset)
/
The selected 
angle will 
appear yellow. 
						

							45
Adjusting the Screen Image
Press the [ ], [ ], [ ] and [ ] buttons on the 
remote control to correct the angle position.
You can also tilt the [ ] button on the remote control to correct 
the angle position.
When the adjustment is complete, press the [Menu] 
button on either the remote control or the projectors 
control panel to close the configuration menu.
3
[          ]:Adjust[    ]      :Move next[ESC]   :Return (Press 1 second to
reset)/
Screen
TIP
 If you press down the [ESC] button on the remote control or the 
projectors control panel for one second while the Quick Corner 
correction screen is displayed, the correction results will be restored 
to their default values.
 If the message Cannot move anymore. appears on the screen 
while using the Quick Corner function, it means that the limit for 
correction has been reached. Check the following two points.
· Is the projection distance appropriate for the size of the projection 
screen?  p.16
· Is the projector tilted too much?   p.40
 If the input signal is interrupted or an image signal that is not 
supported is input while using the Quick Corner function, the 
correction value at that point will be recorded and the Quick Corner 
function will be cancelled.
 When the Quick Corner correction screen is displayed, the following 
functions will be cancelled.
· E-Zoom function  · Real display   · Freeze
4 
						

							46
Adjusting the Image QualityThe quality of the projected images can be adjusted as follows.Projecting Easy-to-see Images Without a Screen  (Wall Shot)
When the Wall Shot function is used, images can be projected without loss 
of original colour even onto surfaces such as blackboards and coloured 
wall surfaces which are being used instead of a screen. For example, if 
projecting onto a green blackboard, the projected images would normally 
appear greenish and be very difficult to see. The Wall Shot function uses a 
sensor to measure the condition of the projection surface and automatically 
adjusts the colour of the projected images based on these measurements.
The Wall Shot function also allows shading to be adjusted. If projecting 
onto a screen that is located near a window, the Wall Shot function can be 
used to obtain clear images when they might otherwise appear faded.
PROCEDUREThe Wall Shot function can be operated using either the remote control or 
the projectors control panel.
Press the [Wall Shot] button on either the remote 
control or the projectors control panel while the 
images are being projected.
When the button is pressed, the current status is displayed on 
the screen.
TIP
Wall Shot can be used for adjustment if the projection distance is 
within approximately 80–1000 cm (2.6–32.8 ft.). However, this 
distance will vary depending on the condition of the projected surface, 
for instance if the projection surface is an extremely reflective surface 
such as a whiteboard, or if it is a highly non-reflective surface such as 
a dark wall.
1
Remote control 
						

							47
Adjusting the Image Quality
To change the status, press the [Wall Shot] button  
while the status is being displayed on the screen.
For example, if you press the [Wall Shot] button while Wall 
Shot OFF is displayed, the status will change to Wall Shot 
ON and measurement of the projection surface will start.
Colours in the order red → green → blue → black will be 
projected for approximately five seconds while measurement is 
in progress.Once the measurement is finished and colour 
correction is complete, the images will be projected 
in the corrected condition.
To cancel the correction, press the [Wall Shot] button while 
Wall Shot ON is being displayed on the screen so that Wall 
Shot OFF is selected.
2
Wall Shot ON
3
TIP
 When the projectors power is turned off, images will be projected 
next time with the status set to Wall Shot OFF. However, the 
correction values that were obtained by the previous measurement 
operation will be stored even when the power is turned off.
If projecting in the same location as before, you can retrieve the 
colour correction values that were used previously (the five seconds 
required for readjustment will not be necessary).
The status will change as follows each time the [Wall Shot] button is 
pressed.
When Wall Shot retrieval is selected, the previous adjustment 
values are retrieved.
 If you change the projection location or change the condition of the 
projection surface, you should repeat the Wall Shot measurements. 
If you press the [Wall Shot] button twice while Wall Shot ON is 
being displayed, Wall Shot Readjustment will be displayed and 
adjustment will then start.
Wall Shot Memory CallWall Shot ON
Wall Shot OFFWall Shot Readjustment Wall Shot ONWall Shot OFF 
						

							48
Adjusting the Image Quality
Adjusting Computer Images
Automatic setup detects analogue RGB signals coming from a connected 
computer, and automatically adjusts these signals so that the optimum 
images can be obtained.
Automatic setup involves adjustment of the following three items: 
Tracking
g, Position and Sync
g. 
Automatic Setup
TIP
 If Auto Setup in the Advanced2 menu is set to OFF (the 
default setting for this command is ON), automatic setup is not 
carried out. If you press the [Auto] button on the remote control or 
the [Auto/Enter] button on the projectors control panel while 
computer images (analogue RGB signals) are being projected, 
adjustment will then be carried out.
 If you press the [Auto] button on the remote control or the [Auto/
Enter] button on the projectors control panel while the E-Zoom 
function or Freeze function is active, the active function will be 
cancelled and then the adjustment will be carried out.
 Sometimes the signals may not be adjusted correctly depending on 
the type of signals being output by the computer. In such cases, use 
the Tracking, Position and Sync. menu commands to make 
the adjustments manually.   p.49, p.50, p.73
 Automatic setup is not carried out while the preview function is 
being used.
Remote control 
						

							49
Adjusting the Image Quality
l
If vertical stripes appear in the projected images, 
and this cannot be fixed using automatic setup, 
you will need to adjust the tracking
g manually 
using the following procedure.
PROCEDURETracking adjustment can be carried out using either the projectors 
control panel or the configuration menus. This procedure explains 
how to use the projectors control panel to adjust the tracking.
For adjustment using the configuration menus: 
See Video - Tracking   p.73
Press the following buttons to adjust the tracking value until the 
vertical stripes disappear from the projected images.
While holding down the [Shift] button on the projectors 
control panel, press the [ ] button.
The tracking value increases each time the button is pressed.While holding down the [Shift] button on the projectors 
control panel, press the [ ] button.
The tracking value decreases each time the button is pressed. Adjusting the Tracking
Projector
Projector
TIP
The images will flash when continuous tracking adjustment is carried 
out, but this is normal.