On Sat, 2006-04-15 at 00:21 -0500, John (KE5C) wrote:
> http://www.bosshardradio.com/gallery/view_album.php?set_albumName=centurion
>
> First, a special thanks to Jerry, K0CQ, who correctly interpreted the
> (completely normal) VOM behavior I was observing when I measured the
> secondary
> resistance of my Centurion's HV transformer. The transformer is indeed fine,
> and tonite I (almost literally) dug further into the Centurion's innards in
> order to get to and properly inspect the HV board. Apparently I suffered a
> flash over where the secondary HV wires are soldered into the board. The
> corona
> dope in this area is well burned. The parallel traces on the pc board
> connecting the HV wire solder holes to the input of the diode chain are
> vaporized in three separate areas - see yellow boxed areas on middle picture
> in
> gallery above. 73, John
Could have been a flash over on the board, or could be shorted diodes
that drew enough current to burn the traces in two and then the
inductive kick and unloaded transformer lead to a flash over. The diodes
should be more delicate than the board, unless its a faulty board design
without enough spacing.
--
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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