This procedure refers to several different models of overhead projector. The distinction between models generally refers to the age of the projector. All of the projectors covered by this procedure use the DYS type lamp. The lamp replacement procedure is nearly identical in all cases.

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

There are various latching mechanisms used for these projectors. Some have no locking mechanism at all, some have a knurled thumbscrew at the rear center of the case, some have plungers on top that you must lift up on, and some...like the one shown here...have a locking lever on the back, near the top of the stage glass. Push the latching lever, lift up on the plungers, or completely remove the thumbscrew, as appropriate, to unlatch the top of the projector.

Now lift up on the back edge of the stage glass frame. The top of the projector will hinge open, revealing the innards of the projector.

Removing the burned-out lamp

The lamp socket is equipped with a lamp ejector. Push the lever down as shown to force the lamp out of the socket. Note that the pins of the lamp are different sizes...take note of which pin goes into which hole so that you can properly install the new lamp.

Installing the new lamp

Important: For optimum lamp life and performance, do not touch the quartz (glass) bulb of the lamp. The oils in your skin will attack the quartz and cause the lamp to fail prematurely.

The lamp comes in a sealed plastic bag. One edge of this bag has a perforation on it. With the lamp still in the plastic bag, grasp the ceramic end of the lamp just above the pins, and tear the perforated end off of the bag. Manipulate the lamp so that the pins protrude through the open end of the bag. With the lamp still in the closed end of the bag, line the pins up with the socket inside the projector, and push the lamp into place. If you are having difficulty inserting the lamp, try turning the lamp over, as it will only fit into the socket one way. Once the lamp is fully seated in the socket, completely remove and discard the plastic bag.

Closing the projector

Close the projector by pushing down on the stage assembly, then reinstalling the thumbscrew, pushing down on the plunger latch, or allowing the latch knob to engage, as appropriate. Make sure the projector is plugged into an electrical outlet, and test it by turning it on. It should light up. Your work here is finished!