Norman P2000D Modeling Light Circuitry

Posted on Feb 6, 2014

There are two independent modeling light circuits for the P2000D - one for each of the two channels. The modeling light circuit is completely independent from the high voltage strobe circuitry - to the point of having its own On/Off switch. This means, of course, that just because the modeling lights are working your strobe circuits can be fried.

Norman P2000D Modeling Light Circuitry
Click here to download the full size of the above Circuit.

Be careful if someone sells you a pack and says - well I can`t test the strobe but the modeling lights are working. There are two modeling light power level potientiometers on the top panel. These lead to a small circuit board in the top half of the pack. This circuit board uses a fairly simple TRIAC dimmer to control the intensity of the lamps. The output from this board runs via a grey wire to Pin F on the strobe lamp connectors. Return power goes via pin E. I traced out the schematic of the control board as best I could. I did not attempt to measure the value of trim pot and could not identify the DIAC (though I pretty much am sure that it is a DIAC based on other dimmer schematics. ) I then sketched out the basic layout and circuit traces in case I needed to repair this circuit in the future. You can see it below (not entirely to scale ) A quick sidebar - When I started the project I had no strobe head. However I just acquired a Norman TriLite (this is a projector lamp and strobe light in a spotlight type assembly) [more] So now that I warmed up with the modeling light circuit, it is time to start sketching out the high voltage circuitry use for the strobes. As I saw no transformer large enough to be used to step up the mains voltage, I knew that a voltage multiplier must be used. A 2X multiplier would not produce enough voltage but a 3X mutliplier should.

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