Mirror Setup

Both the primary and secondary mirrors will both need to be set up to get the correct light path to make the image from the projector fall correctly on the screen. We recommend starting the setup with the primary mirror

📄 It is normally easiest to do the setup with the lens ‘centred’. Dependant on the projector this may me a manual function or called ‘Lens Calibration’ or ‘Lens Centre’. Next you will need to use the projector offset to shift the image down as far as possible (This will have the effect of shifting the image up the primary mirror. Primary mirror setup To gain access to the primary mirror you will need to open the drop-down flap on the bottom of the MMD.

  1. Power up the control box by plugging in the control box to the power supply and applying power.

  2. Connect the MMD control box via USB to a computer with the DT-Actuator Commander software installed (see above section)

  3. Press the ‘Forward’ button on the Actuator Commander Software. The mirror flap will move down while this is held. Release the button to stop.

  4. Manually adjust the primary mirror so that the image from the projector sits centrally on the mirror with the mirror roughly at a 45 degree angle.

  5. Lock the mirror into place.

  6. Tilt the primary mirror so that the light path hitting the secondary mirror hits the secondary mirror towards to the top of the secondary mirror – (nearest the hinge point)

Secondary mirror setup

The secondary mirror setup will require the screen to be installed and set to its correct position. The only adjustment on the secondary mirror is the angle.

Forward Limit Position (Open Position)

⚠️ By default, the MMD will be set to its fully open position. It’s likely to ensure the mirror flap will need to be more closed in operation. Only decrease this figure from that set in thr factory dedault. Increasing it can cause damage to the MMD.

  1. Follow the ‘Setting stops’ section of the Actuator Commander instructions above to set the required ‘Forward Limit’ Open Position of the mirror.

  2. Use the Forward and Backward buttons in the software to test the newly saved limit position

  3. The light path on the screen should sit in the middle of the screen top to bottom when the correct limit position is reached.

📄 You will have to repeat this process several times to get the exact desired position.

Backward Limit Position (close Position)

⚠️ By default, the MMD will be set to its fully closed position. It’s likely to ensure the mirror flap sits flush with the ceiling you will need to increase the close parameter.

  1. Follow the ‘Setting stops’ section of the Actuator Commander instructions above to set the required ‘Reverse Limit’ Open Position of the mirror.

  2. Use the Forward and Backward buttons in the software to test the newly saved limit position

  3. The light path on the screen should sit in the middle of the screen top to bottom when the correct limit position is reached.

📄 Note that it normally takes several adjustments of both the primary and secondary mirror and the projector in tandem to get the complete light path set up. After the first round of setting you will likely notice keystone on the image which us usually adjusted by returning to the primary mirror and correcting its angle slightly. Once the image is square you may also need to adjust the vertical lend shift on the projector to alight the image on the screen without moving the mirrors further.