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Overhead
Projector Relamping Guide
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3M 900-Series Models
| This procedure refers to the
3M 900AJA series of overhead projectors. All of the projectors
covered by this procedure use the ENX type reflector lamp. |
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Relamping Procedure
CAUTION:Before opening the housing and replacing a burned-out
lamp, be sure the lamp has cooled thoroughly. Unplug the power cord
if possible before changing the lamp.
Opening the projector
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The lamp is located under the hinged panel
at the front of the projector. Simply lift up on the front
edge of this panel. It will hinge open, revealing the lamp.
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Removing the burned-out lamp
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The lamp socket is equipped with a lamp ejector.
Push the lever away from you to lift the lamp out of the socket.
It will take some effort, and may not fully release the lamp
from the socket and lamp holder. If this happens, pull the
ejector lever back, then lift the lamp straight up out of
the lamp holder.
Once the lamp is out, pull the lamp eject
lever back.
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Installing the new lamp
Important: For optimum lamp life and performance, do
not touch the quartz (glass) bulb at the center of the lamp. The
oils in your skin will attack the quartz and cause the lamp to fail
prematurely.
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When you remove the lamp from the box, handle
it only by the outside of the reflector. Turn it so that the
pins are side by side and oriented vertically. Insert the
lamp into the lamp holder so that the back edge of the reflector
is held by the spring clips. Insure that the pins are carefully
lined up with the slots in the top of the ceramic socket,
and gently push down on the lamp until it is fully seated
in the socket and in the lamp holder. You may need to gently
push on the back of the socket to insure that the lamp pins
are properly seated. There should be no gap between the glass
base of the lamp and the ceramic socket.
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Note: This illustration shows an Elmo
projector which is similar, but not identical.
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Closing the projector
Close the projector by pulling down on the hinged cover panel until
it snaps into place. Make sure the projector is plugged into an
electrical outlet, and test it by turning it on. It should light
up. If it fails, double check to make sure that the lamp
is properly seated in the socket. Try removing the lamp and turning
it over. Sometimes the lamp pin tolerances are off a little, and
inverting the lamp will solve the problem. Once you get it working,
your work here is finished!
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