Why Does My Overhead Projector Keep Blowing Lamps?

Over the past 25 years I have had the unique opportunity to talk directly
with many of the professionals and instructors who use Overhead Projectors
as an integral part of their profession. The stories they have shared with
me have given me direct insight to some of the most common problems
experienced by owners of today’s and yesterday’s Overhead Projectors.

I would like to share this unique compilation of information with a series
of articles derived directly from some of the most common questions and
complaints that I receive from my clients in the Audio Visual Industry.

The first thing that comes to my mind is the question that I am asked
almost every day; “My Overhead Projector keeps blowing lamps, what could be
the problem?”

Most of today’s Overhead Projectors use projection lamps that require 82
volts to operate. Because the AC outlet that you plug your Overhead
Projector into is 120 volts, a special electronic component is required to
create the 82 volts needed to operate the projection lamp. This electronic
component is called a diode (rectifier).

When the diode (rectifier) of your Overhead Projector becomes defective, it
allows the line voltage of 120 volts to go directly to the 82 volt lamp.
This additional voltage is too much for the projection lamp to handle, when
the user turns the overhead projector on, the projection lamp will burn out
in a matter of seconds due to this excessive voltage. In some cases the end
user will place several new lamps into the Overhead Projector before they
realize that the problem is not a defective projection lamp.

If you have a basic knowledge of Electronics or basic wiring the diode is
something that most end users can replace themselves, otherwise this
problem should be handled by a professional service technician.

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. You can contact etbinc@comcast.net [http://www.mbelectronics.com> M-B Electronics at 800-872-9456 or at: [http://www.mbelectronics.com/article.aspx?id=70]

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