If the equipment is not functioning correctly in a TILE classroom, resetting the Crestron MPS-300/DMPS-300-C switcher may resolve the issue. While the MPS-300 is pictured below, this process is identical for the DMPS-300-C.
First, locate the device in the instructor's podium. It will be marked "MPS-300" on the bottom right corner of the panel.
There are two reset buttons, "HW-R" and "SW-R". A hardware reset is usually preferred, so use a pen or paperclip to press and hold the "HW-R" button for about 10 seconds. When the button is released, the system will reboot. This may take a minute to complete.
Once the cycle has completed, the system should function as expected.