Has Your Overhead Projector Had Its Annual checkup?

You go to the doctor every year for your annual checkup. You see the
dentist every six months to have your teeth checked and cleaned, you take
your car to the shop every 3000 miles to have the oil changed and most
States have an annual State Safety Inspection to make sure that your car is
operating safely. So why would it be any different with your Overhead

Proper care, cleaning and general maintenance by a professional technician,
can add years to the life of any piece of Electronic Equipment including
your Overhead Projector.

Each year our service department offers an annual maintenance program for
all of the School Districts that we service. It has been our experience
with any type of projector or electronic device that uses a fan for cooling
acts like a vacuum cleaner for dust. Most environments that Overhead
Projectors and electronic devices are subject to are quite dusty. Over a
period of a year an enormous amount of dust can collect inside these units.

Dust can become a fire hazard if enough has built up inside the Overhead
Projector. Because of the heat produced by today’s Halogen Projection
Lamps, an excessive build up of dust can create a fire hazard.

Dust can also decrease the efficiency of your cooling system by over fifty
percent, which of course can cause damage to internal components like your
fresnel lens and other expensive optical parts. We have seen projectors so
dirty that the plastic case has actually begun to melt because of the
excessive heat produced by poor cooling. This causes parts like latches and
switches to not work properly because the case that they are mounted to
becomes distorted and not fit properly.

We all know that cigarette smoking can be hazardous to your health, but
were you aware that it is also hazardous to your Overhead Projector. Not as
common a problem as it was ten years ago, but the build up of tar and
nicotine on the internal parts of your Overhead Projector can cause optics
to become hazy and cooling systems to be less efficient or even fail all

General maintenance of your Overhead Projector should include removing all
of the dust and other debris from the projector with a compressor with at
least forty pounds of pressure. The remaining dirt and dust should be
removed with a light household cleaner or even a cloth lightly dampened
with water. The fan motor bearings should be lightly lubricated with a
light oil. Take special care not to use excessive amounts of oil otherwise
the fan ends up blowing it all over the internal optics of the projector.

The Fresnel Lens should be removed and cleaned only with water. The stage
glass and other optics should also be cleaned with water, other chemicals
or cleaners could damage these sensitive items.

Focus assemblies should be checked for wear and replaced as necessary.
Focus assemblies not aligned properly diminish the quality of your
projected image and in some extreme cases have caused the plastic parts of
the head assembly to melt.

It has been our experience that Overhead Projectors and other Electronic
Equipment that receives routine scheduled maintenance last fifty percent
longer than equipment that does not. So go ahead, make an appointment for
you Overhead Projectors checkup today.

Mark Boehm is the president of M-B Electronics
[http://www.mbelectronics.com] He has over 25 years of experience in the
Audio Visual and Electronics Industry. He can be contacted at 800-872-9456
or at:etbinc@comcast.net. More information on this subject:

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