Epson Powerlite 7200 Users Guide

							Connecting to an External Speaker or PA System
53
Connecting to an External Speaker or 
PA System 
  
Although the projector’s internal speakers are enough for most small- 
or medium-size rooms, you can connect the projector to an external 
speaker or public address (PA) system for large rooms or to gain 
maximum benefit from the projector’s built-in 3D sound function.
To connect the projector to an external sound system, you need to 
obtain an RCA-to-3.5 mm stereo audio cable. You can get one from 
your computer dealer.
1. Turn off the projector and speaker or PA system if they are on.
2. Connect the cable’s 3.5 mm stereo miniplug to the projector’s 
Audio Out jack. 
Audio Out jack
stereo audio cable
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							1  •  Setting Up the Projector             54
Note: EPSON offers the Mediaphile PAS (personal audio system) for 
external amplification. See page page 4 for the part number and 
ordering information.
3. Connect the RCA plugs to the external amplified speaker or PA 
system. Insert the cable’s red plug into the Audio R jack, and the 
white plug into the Audio L jack.
Note: The internal speakers are disabled when an external audio 
system is used.
Turning the Equipment On and Off
It’s best to turn on the projector and its attached equipment in the 
following order:
1. Video source (such as a VCR), if your video source is not your 
computer
2. Audio source (if different from computer or video source)
3. Computer
4. External amplified speaker or PA system (if necessary)
5. Projector
When you are ready to turn off the equipment, turn them off in the 
reverse order. 
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							Turning the Equipment On and Off
55
Turning the Projector On and Off
Follow these steps to turn on the projector:
1. Connect one end of the power cord to the projector’s power inlet. 
2. Connect the other end to a grounded electrical outlet. The Power 
light on the projector’s control panel turns orange, indicating that 
the projector is in sleep mode. (The projector is not turned on 
yet.)
3. Remove the projector lens cap. 
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4. Press the Power button on the remote control or control panel to 
turn on the projector. The Power light flashes green as the 
projector warms up.
If computer or video equipment is attached, the computer or video 
signal is projected. Allow about 30 seconds for full illumination.
F
Warning: Never look into the lens when the lamp is on. This can damage 
your eyes. It is especially important that children not look into the lens.
When you want to stop projecting images, press the Power button 
again. The fan remains on and the projection lamp light flashes orange 
for about 60 seconds as the projector cools down.When the projector 
has cooled down, flashing stops. The power light remains orange. 
Note: If you press the Power button to turn the projector back on while 
the Power light is orange, there may be a delay before a projected image 
appears.
When you are done using the projector, unplug the power cord.
Never unplug the power cord when the power light is green or you 
may damage the lamp.
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							57
2Using the Projector
T
his chapter provides the following information about using your
projector:
l
Positioning the projector relative to the screen
l
Focusing and positioning the screen image
l
Controlling the projector with the remote control and the control 
panel
l
Monitoring the projector’s operating status
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							2  •  Using the Projector             58
The illustration below identifies the parts of your projector.
Positioning the Projector
Your projector supports front, rear, and ceiling projection, allowing 
you to choose the best method for displaying your images. 
If you use rear or ceiling projection, you need to select this in the 
projector’s Options menu. See page 85 for more information. 
adjustable feet foot adjust levercontrol panel
status lights
infrared receiver 
infrared receiver
foot adjust 
lever
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							Positioning the Projector
59
To get the best results when projecting your images, it’s important to 
position the projector at the proper height and distance relative to the 
screen.
When projecting from a table or desk, place the projector so the lens is 
aligned as closely as possible with the bottom of your screen:
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							2  •  Using the Projector             60
When projecting from the ceiling, align the lens as closely as possible 
with the top of your screen:
Calculating Image Size and Projection Distance
The distance between the projector and the screen determines the 
actual image size. To determine the exact distance required for a 
particular image size (or to determine the size of an image at a 
particular distance), use the formulas given below. (Remember that the 
size of the image can be changed by rotating the zoom ring; see 
page 63 for more information.)
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							Positioning the Projector
61
To determine the minimum and maximum diagonal size of an image 
when you know the projection distance:l
Inches:
Maximum diagonal size = (0.6124 ´ projection distance) + 1.5264
Minimum diagonal size = (0.4556 ´ projection distance) + 1.1410
l
Centimeters:
Maximum diagonal size = (0.6124 ´ projection distance) + 3.8771
Minimum diagonal size = (0.4556 ´ projection distance) + 2.8981
To determine the projection distance when you know the diagonal size 
of the screen image:
l
Inches:
Maximum projection distance = (2.1949 ´ diagonal size) - 2.5044
Minimum projection distance = (1.6328 ´ diagonal size) - 2.4923
l
Centimeters:
Maximum projection distance = (2.1949 ´ diagonal size) - 6.3612
Minimum projection distance = (1.6328 ´ diagonal size) - 6.3304
For example, here are the measurements for three installations:
* For an image size of 300 inches, the projector may be up to 54 feet away from 
the screen, depending on the setting of the zoom ring. Image size (diagonal)Horizontal distance from projector to screen
Minimum Maximum
300 inches* (762 cm) 487.3 inches (12.4 m) 656.0 inches (16.7 m)
200 inches (508 cm) 324.1 inches (8.2 m) 436.5 inches (11.1 m)
100 inches (254 cm) 160.8 inches (4.1 m) 217.1 inches (5.5 m)
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							2  •  Using the Projector             62
Long Throw Zoom Lens Calculations
If you are using the optional long throw zoom lens, use the following 
formulas instead:
To determine the minimum and maximum diagonal size of an image 
when you know the projection distance:l
Inches:
Maximum diagonal size = (0.4742 ´ projection distance) + 3.2489
Minimum diagonal size = (0.2849 ´ projection distance) + 1.8968
l
Centimeters:
Maximum diagonal size = (1.2045 ´ projection distance) + 8.2522
Minimum diagonal size = (0.7236 ´ projection distance) + 4.8179
To determine the projection distance when you know the diagonal size 
of the screen image:
l
Inches:
Maximum projection distance = (3.5094 ´ diagonal size) - 6.6568
Minimum projection distance = (2.1090 ´ diagonal size) - 6.8519
l
Centimeters:
M
aximum projection distance = (8.9139 ´ diagonal size) - 16.9083
M
inimum projection distance = (5.3569 ´ diagonal size) - 17.4038 
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