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Old overhead projector blowing bulbs, diode issue...

Discussion in 'Troubleshooting and Repair' started by rplydon, Jun 6, 2013.

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  1. rplydon


    Jun 6, 2013
    So I have an old Elmo HP-355 overhead projector that just started blowing bulbs. The bulbs are of the 82v 360 watt variety. I am fairly certain that it is using some sort of diode to drop the voltage down from the rectified 110 line voltage to get the 82 volts. As I do not think that there is a replacement part for this anymore, what sort of diodes would I need to replace this part with modern components? Thank you very much.
  2. duke37


    Jan 9, 2011
    You can normally check a diode with a meter, they will either be open circuit or shorted. In your case a shorted diode will give too high a voltage

    If it is a diode, which I am not sure, then a 400V 10Amp diode would do. It would need to be in the same configuration to fit to the heat sink. Is there a number on it?
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