How to Repair an Overhead Projector. In a world of PowerPoint presentations and the latest digital downloads, the overhead projector may seem obsolete. The fact of its continuous use in schools and colleges across the nation shows the perseverance of this classroom essential. But, when it breaks down...then what? Look below for a few tips on how to repair an overhead projector.
Check the bulb has not blown and is of the correct voltage for the machine. Voltage information is usually located on a label at the back of the machine. Bulbs are available online and in most major office supply stores.
Ensure the wire is not loose from the plug by tugging gently on the cord. Cover any exposed or frayed wires with electrical tape, get a new wire and plug if there is significant damage.
Remove the top of the projector and compare the wiring with the diagram in the projector's manual. Check all the wires are connected as listed and none are missing. If you don't have the original manual use the model number located on the back label to get a replacement online.
Clean the projection screen with glass cleaner and a clean dry cloth to remove and dirt or debris from the surface. This will improve the overall projected image and prevent scratches to the surface.
Adjust focus if image appears blurry. If you suddenly have problems seeing the projected image it could be a simple matter or accidental movement to the focus element of your projector. Focus adjustment is located on the projector head in most cases and must be manipulated by hand.
Turn and twist the adjustment tool on the head arm to ensure it is not loose and in need of replacement. This could affect focus of the image.
Consider consulting a professional to perform a routine maintenance or diagnostic run on your overhead projector. Although costly, this is always cheaper than replacing the entire product for what could turn out to be a simple repair.