Optoma Tx761 Projector User Manual

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Appendices
Image Problems
 No image appears on-screen
 Ensure all the cables and power connections are correctly and 
securely connected as described in the “Installation” section.
 Ensure all the pins of connectors are not bent or broken.
 Check if the projection lamp has been securely installed. Please 
refer to the “Replacing the lamp” section.
 Make sure you have opened the lens door and the projector is 
switched on.
 Partial, scrolling or incorrectly displayed image
 Press...

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 6.  Select the “Change” button under the “Monitor” tab.
  7.  Click on “Show all devices”. Next, select “Standard monitor 
types” under the SP box; choose the resolution mode you need 
under the “Models” box. 
  8.  Verify that the resolution setting of the monitor display is lower 
than or equal to SXGA+ (1400 x 1050). (*)
 If you are using a Notebook:
  1.  First, follow the steps above to adjust resolution of the comput
-
er.
  2.  Press the toggle output settings. Example:...

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Appendices

 Image is out of focus
 Make sure the lens door is opened.
 Adjusts the Focus Ring on the projector lens. 
 Make sure the projection screen is between the required dis-
tance 3.9 to 39.4 feet (1.2 to 12.0 meters) from the projector.  
See page 19.
 The image is stretched when displaying 16:9 DVD title
When you play anamorphic DVD or 16:9 DVD, the projector 
will show the best image in 16:9 format on projector side.
If you play 4:3 format DVD title, please change the format as...

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Appendices

Intermission Problems
 The projector stops responding to all controls
 If possible, turn off the projector, then unplug the power cord and 
wait at least 60 seconds before reconnecting power.
 Lamp burns out or makes a popping sound
 When the lamp reaches its end of life, it will burn out and may  
make a loud popping sound. If this happens, the projector will not 
turn on until the lamp module has been replaced. To replace the 
lamp, follow the procedures in the “Replacing the...

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Appendices

 Message Reminders
 
 Fan failed:
 
 Temperature warning:
 
 Replacing the lamp:
 
 Out of range: (refer to page 49)
   

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Appendices

 
Remote Control Problems
 If the remote control does not work
 Check the operating angle for the remote control is approximately 
±22.5°.
 Make sure there are no obstructions between the remote  
control and the projector. Move to within 6 m (20 ft) of the  
projector.
 Make sure the batteries are inserted correctly.
 Replace weak batteries in the remote control. 

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Replacing the lamp
The projector automatically detects the lamp life. When the 
lamp life is nearing the end of use, you will receive a  
warning message.
 
When you see this message, please contact your local reseller 
or service center to change the lamp as soon as possible. 
Make sure the projector has been cooled down for at least 30 
minutes before changing the lamp. 
 Warning: Lamp compartment may be hot! Allow it to cool down 
before changing the lamp!
 Warning: To reduce...

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Lamp Replacement Procedure:
1.  Switch off the power to the projector by pressing the “Power/Standby” button.
2.  Allow the projector to cool down for at least 30 minutes.
3.  Disconnect the power cord.
4.  Press down and then pull the cover carefully. 
5.  Open the top cover. 
6.  Use a screwdriver to remove the 2 screws from the lamp module. 
7.  Pull up the lamp handle. 
8.  Remove the lamp module. 
To replace the lamp module, reverse the previous steps.
9.  Turn on the...

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	“*”compressed computer image.
Compatibility ModesCompatibility Modes
 Computer Compatibility
 Video Compatibility
NTSCM (3.58MHz), 4.43 MHz, 480i/p @60Hz
PALB, D, G, H, I, M, N, 576i/p @50Hz
SECAMB, D, G, K, K1, L
HDTV480p, 576p, 720p, 1080i (50/60 Hz)
ModeResolutionV-Sync (Hz) 
AnalogDigital
VGA640 x 35070, 8570, 85
VGA640 x 4008585
VGA640 x 48060, 72, 75, 8560, 72, 75, 85
VGA720 x 40070, 8570, 85
SVGA800 x 60056, 60, 72, 75, 8556, 60, 72, 75, 85
XGA1024 x 76860, 70, 75,...

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Appendices

RS232 Commands
Pin no.NameI/O (From Projec-tor Side
1TXDOUT
2RXDIN
3GND__
Pin no.Spec.
1R(RED)/Cr
2G(GREEN)/Y
3B(BLUE)/Cb
4GND
5GND
6GND
7GND
8GND
9DDC 5V
10GND
11GND
12DDC Date
13HD/CS
14VD
15DDC Clock
12345
678910
1112131415
12
3
RS232 ConnectorVGA-In Connector