Introduction
This manual provides essential information for the safe and efficient operation of your Optoma GT750 Projector. Please read it thoroughly before use and retain it for future reference.
Safety Information
- Do not block ventilation openings.
- Do not expose the projector to rain or moisture.
- Refer all servicing to qualified service personnel.
- Avoid looking directly into the projector lens when the lamp is on.
Product Features
Figure 1: Optoma GT750 Projector. This image shows the top and front-right side of the black projector, highlighting the lens, ventilation grilles, and control panel.
- Native widescreen 720p (1280 x 720 pixels) resolution.
- Supports computer resolutions up to 1920 x 1080 pixels (HD).
- Accepts common global video inputs and formats up to 1080p.
- HDMI 1.4a 3D signal compatibility for 720p 3D display.
- 3000 ANSI lumens brightness with a 3000:1 contrast ratio.
- Built-in 10-watt speaker system.
- DLP Link 120Hz 3D-capable display technology, with RF 3D technology options.
- Compact design for portability.
Setup
1. Placement
Position the projector on a stable, flat surface. Ensure adequate ventilation around the unit. The GT750 is a short-throw projector, allowing for large images from a short distance. Due to the absence of lens shift or significant zoom, precise placement relative to your screen is crucial for optimal image alignment.
2. Power Connection
- Connect the power cord to the projector's power inlet.
- Plug the other end of the power cord into a grounded electrical outlet.
- Press the power button on the projector or remote control to turn on the unit.
3. Initial Image Adjustment
- Focus: Rotate the focus ring on the projector lens until the image is sharp and clear.
- Keystone Correction: If the image appears trapezoidal, use the keystone correction function in the projector's menu to adjust it to a rectangular shape.
Connecting Devices
The Optoma GT750 offers various input options for connecting your devices.
- HDMI: Connect Blu-ray players, gaming consoles, or computers using an HDMI cable. The projector supports HDMI 1.4a for 3D content.
- DisplayPort: Connect compatible devices using a DisplayPort cable.
- VGA (PC): Use a VGA cable to connect a computer.
- Composite Video: For older video sources, use a composite video cable.
- Audio Input/Output: Connect external audio sources or speakers if desired, though the projector has a built-in 10-watt speaker.
After connecting a device, select the appropriate input source using the projector's menu or the remote control.
Operating the Projector
1. Power On/Off
- Press the Power button on the projector or remote control to turn the unit on.
- Press the Power button twice to turn the unit off. Allow the projector to cool down before unplugging.
2. Menu Navigation
Use the arrow buttons on the projector or remote to navigate through the on-screen display (OSD) menu. The Enter button confirms selections, and the Menu button exits the current menu.
3. 3D Operation
The GT750 supports 3D content via HDMI 1.4a. To view 3D content:
- Connect a 3D-compatible source (e.g., Blu-ray player) via HDMI.
- Ensure your 3D content is playing.
- Wear compatible DLP Link 120Hz 3D glasses or RF 3D glasses (if using an RF emitter).
- The projector should automatically detect the 3D signal. If not, check the 3D settings in the OSD menu.
Maintenance
1. Lamp Care
- The lamp has a limited lifespan. Replace it when the image becomes dim or a lamp warning indicator appears.
- Always allow the projector to cool down completely before replacing the lamp.
- Use only genuine Optoma replacement lamps.
2. Cleaning
- Exterior: Wipe the projector casing with a soft, dry cloth. Do not use abrasive cleaners.
- Lens: Gently clean the lens with a lens cleaning cloth and specialized lens cleaning solution. Avoid touching the lens with bare hands.
- Air Filters: Regularly check and clean the air filters to ensure proper ventilation and prevent overheating. Refer to the full user manual for filter location and cleaning instructions.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No image displayed | Power not connected; Input source not selected; Cable loose | Check power connection; Select correct input; Reconnect cables securely |
| Image is blurry | Focus not adjusted; Projector too far/close | Adjust focus ring; Reposition projector for optimal throw distance |
| Image is trapezoidal | Projector not perpendicular to screen | Use keystone correction in the OSD menu |
| No 3D effect | Incorrect 3D glasses; Source not outputting 3D; 3D mode not enabled | Ensure compatible glasses; Verify source 3D output; Check projector 3D settings |
| No sound | Volume too low; Audio cable not connected; Muted | Increase volume; Connect audio cable; Unmute projector |
Specifications
- Model: GT750
- Display Technology: DLP
- Native Resolution: 720p (1280 x 720)
- Maximum Resolution: 1080p (1920 x 1080)
- Brightness: 3000 ANSI Lumens
- Contrast Ratio: 3000:1
- Aspect Ratio: 16:9 Native, 4:3 Compatible
- Connectivity: HDMI, DisplayPort, VGA, Composite Video
- Audio: Built-in 10-watt speaker
- Dimensions (W x D x H): 12.76 x 9.21 x 3.82 inches (approx.)
- Weight: 4 ounces (approx.)
- 3D Compatibility: HDMI 1.4a 3D (720p), DLP Link 120Hz, RF 3D options
Warranty and Support
Your Optoma GT750 Projector is covered by a manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions. For technical support, service, or replacement parts, please visit the official Optoma website or contact their customer service department.
Optoma Website: www.optoma.com
