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In Reply to: RE: Semiconductor ID help needed posted by Eli Duttman on April 26, 2015 at 19:43:13
Eli,Thanks for your response. The board has two TO-220 devices. The one I posted before, Q4, which I am calling bad, and Q3, which I think is good. I unsoldered Q3 so I could turn it over and it does have the same top number on it. So I think I have a good part of the same number. The "good" part, Q3, measures infinite from D to S in either direction. It also shows a forward voltage on the diode test of 0.56 volt with the -lead on D and +lead on S. The other way shows infinite or open. So this would look like an enhancement part? Is it P or N?
Additional tests:
Between G and D, another diode junction is detected. With +lead on G and minus lead on D, I measure 0.58 volt forward voltage. The other way is open circuit. Resistance test shows infinite either way.
Also between G and S, I measure about 42 ohms either polarity and forward voltage is low either polarity (no diode junction detected in this way)Tests made with BK Precision Test Bench 388-HD.
Did I give you enough info to ballpark the type?
Thanks,
John
Edits: 04/27/15Follow Ups:
Just a WAG, a 100 V./50 W. rated "N" channel enhancement mode FET could be tried. Mouser carries all sorts of MOSFETs. Check their website out.
Eli D.
Thanks, Eli. I appreciate your looking at this.
John
Also see if there is a replacement board available. Yeah - like they would provide that!
Also test parts associated with that SCR.
This is vintage! Meaning-no boards available new, and not even a schematic available.
I have checked the bipolars and diodes and all seem OK.
Thanks for the suggestions.
John
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