Epson Powerlite 7550c Users Guide

							6    Troubleshooting             148
w
The colors of the image are not right.
The color balance may be incorrect. If you’re displaying a computer 
image, use the Color option in the Video menu to adjust the balance 
of red, green, and blue. If you’re displaying video, adjust the Color 
and Tint (NTSC only) settings on the Video menu.
Check your monitor’s color balance if you’re displaying a computer 
image.
w
There is no sound.
Make sure the volume setting isn’t turned all the way down and that 
the audio cable is securely attached to both the projector and the 
audio source. Also, make sure that the Mute button is not enabled.
The wrong source may be selected. Press the Source button on the 
remote control or control panel to select the proper source. 
						

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7Technical Specifications General
Type of display Poly-silicon Thin-Film Transistor
(TFT), active matrix
Size of liquid crystal panels    Diagonal: 0.9 inches (22.9 mm) 
Lens F=1.7 to 2.0, f=37 to 48 mm
Resolution 5550C: SVGA 800 
× 600 pixels
7550C: XGA 1024 × 768
Color reproduction 24 bit, 16.7 million colors
Image brightness 850 lumens (ANSI)
Image size 19 to 300 inches 
						

							7    Technical Specifications             150
Projection distance 3.3 to 53.5 feet (1.0 to 16.3 meters)
(standard 8.2 feet [2.5 meters] on
60-inch screen)
Projection methods Front, rear, upside-down (ceiling
mount)
Optical aspect ratio 4:3 (horizontal:vertical)
Zoom ratio 1:1.3
Tilt angle 0° to 12°
Supported video 
interface standards NTSC, NTSC 4.43, PAL, PAL N,
PAL M, PAL 60, SECAM
Sound
Internal speaker system 2 
× 1 W SRS 3D stereo output
Effective frequency range 100 to 15000 Hz
S/N ratio 71 dB
Projector 
Lamp
Type UHE (Ultra High Efficiency)
Power consumption 120 W
Lamp life 2000 hours at 50% brightness
Part number ELPLP07 
						

							151
Remote 
Control
Range 32.8 feet (10 meters)
Batteries Alkaline AA (2)
I/R receiver interface Supports Xantech
® IR repeaters, 
3.5 mm stereo mini-jack
right/left:  ± 30
°; upper/lower: ± 15
°
Mouse
Compatibility
Supports PS/2, serial, ADB, and 
98 Bus
Repeater Interface
Supports Xantech IR repeaters, 
3.5 mm stereo mini-jack
Mechanical
Height 3.7 inches (93 mm)
Width 9.4 inches (238.5 mm)
Depth 13.6 inches (346 mm)
Weight 9.4 lb (4.3 kg)
Electrical
Rated frequency 50/60 Hz
Power supply 100 to 120 VAC ± 10%
, 2.2 A, 
50/60 Hz
200 to 240 VAC ± 10%
, 1.0 A, 
50/60 Hz
Power consumption Operating: 220 W
Standby: 30 W
Noise Level
≤ 41db-A (normal use) 
						

							7    Technical Specifications             152
Environmental
Temperature Operating: 41 to 95 °F (5 to 35 °C),
non-condensing
Storage: 14 to 140 °F (–10 to 60 °C),
non-condensing
Humidity Operating: 20 to 80% RH, 
non-condensing
Storage: 10 to 90% RH, 
non-condensing
Safety
United States FCC Part 15J Class B
UL1950 Rev. 3
Canada DOC SOR/88-475
CSA C22.2 No. 950 Rev. 3 
						

							153
Supported Computers and Monitor Displays
The following table lists the display formats supported by the 
projector.
* PowerLite 7550 only.Note: The frequencies of some computers may not allow the image 
to be displayed correctly.
 Computer type Formats Resolutions
IBM PC and 
IBM PC-compatibleEGA
NEC PC 400
VGA60, VESA 72/75/85
VGA Text
VGA Text
SVGA 56/60/72/75/85
XGA 60/70A/75/85
SXGA 70/75/85
SXGA 85
SXGA 60/75640 
× 350
640 
× 400
640 
× 480
720 
× 350
720 
× 400
800 
× 600
1024 
× 768
1152 
× 864
1152 
× 864*
1280 
× 1024*
Apple Macintosh Standard 8- and          13
24-bit color monitor    16
                                   19
                                    21640 
× 480
832 
× 624
1024 
× 768
1152 
× 870
EWS 1280 
× 1024
TV NTSC
PAL, PAL60, SECAM640 
× 480
768 
× 567 
						

							7    Technical Specifications             154
Computer In and Computer Out connector pin assignments
The Computer In and Computer Out connectors are female video 
RGB, 15-pin micro-D-style connectors. The pin assignments are:
PinComputer Out
connector signalsComputer In
connector signals
1 Red analog input Red video
2 Green analog input Green video
3 Blue analog input Blue video
4 Reserved Monitor (ID bit 2)
5 GND GND
6 Red GND Red video GND
7 Green GND Green video GND
8 Blue GND Blue video GND
9 Reserved +5 V
10 GND Synchronous GND
11 Reserved Monitor (ID bit 0)
12 Reserved SDA
13 Horizontal sync/composite sync  Horizontal sync
14 Vertical sync  Vertical sync
15 Vertical sync (SCL) 
						

							155
Glossary
Brightness
The balance of light and dark shades in an 
image.
Composite video
A type of video signal that encodes picture, 
luminance, and synchronization information so 
it can be carried in one signal.
Contrast
A measure of the tonal differences between the 
highlights and shadows of an image. In a 
high-contrast image, light areas are very bright 
and dark areas are very dark, with relatively few 
levels of gray between white and black. 
Contrast is decreased by adding grays.
NTSC
A 525-line video broadcast format developed 
by the National Television Standards 
Committee. NTSC is widely used in North 
America, Mexico, and Japan. 
						

							Glossary             156
PAL
  Phase Alternation by Line. A 625-line video 
broadcast format used in Western Europe, 
India, China, Australia, New Zealand, and parts 
of Africa.
Point
  A measurement of drawn or printed objects. 
One point equals 1/72 inch.
Rear Projection
Projecting the image from behind the screen.
Resolution
A measure of the amount of detail contained in 
an image. Resolution can be measured in dots 
per inch or in pixels. Image sharpness and 
clarity improve as resolution increases.
RGB
A type of color scheme that defines color as 
percentages of red, green, and blue.
S-Video
A type of video signal used in S-VHS videotape 
formats. It transmits luminance and color 
separately.
SECAM
System Electronique pour Couleur Avec 
Memoire. A 625-line TV system used in 
France, Eastern Europe, Russia, and parts of 
Africa.
Sleep mode
A power-saving feature in which the projector’s 
lamp is turned off when the projector has not 
been used for 30 minutes. In sleep mode, only a 
minimum amount of the projector’s circuitry 
remains on. 
						

							157
SVGA
Super Video Graphics Array. SVGA provides 
higher resolution than VGA.
SXGA
Super Extended Graphics Array. SXGA 
provides higher resolution than XGA.
VGA
Video Graphics Array. A high-resolution 
display adapter that provides a variety of video 
modes.
XGA
Extended Graphics Array. IBM’s next 
generation display adapter, XGA provides 
higher resolution than VGA.