On Thu, 29 Nov 2007 12:02:05 -0700, J Blaser
<oldcpu2 at rogerwilco.org>wrote:
In fact, a
couple of the PS PCBs went through the dishwasher to clean up the
remains to 'rodent residue'. On the whole, it seems that I got them
back together properly! ;)
If there are any potentiometers on the boards that you washed, you
might want to ensure that the wipers are making contact. Generally,
pots are installed after a board wash unless they are sealed. An open
wiper will cause many of the symptoms you are describing.
An easy method is to measure the resistance across the pot and then
the resistance from each leg to the wiper. The sum of the wiper to
legs should equal the resistance across the pot.
If the wiper appears to be disconnected, mark its position and then
rotate the wiper through its travel and then back to the mark. If
this fails to restore contact or the wiper contact is intermittent,
replace the pot - it's not worth the effort trying to save a failing
potentiometer.
CRC