[R-390] IF module ---

[Flowertime01 at wmconnect.com]

Pete,

Into the mechanical ground points you go. Some where one of the ones in the 
IF deck is not clean enough. My last go round was one that set the 16KHz 
filter into oscillation. 

It was one of the ground lugs. AGAIN

The lug looked fine. The solder looked fine. The connection was unbolted 
and looked fine. The problem persisted. I ignored the problem and went about 
doing some recapping.

Shazam

As I was unsoldering one of the ground leads on a cap, the tin plate on the 
lug flaked off. I cleaned up the lug, got it re tinted so the solder would 
stick and went about replacing the cap.

The oscillating problem went away with that cap change. I was changing the 
cap because it looked ugly (leaky ugly). Was it the cap or the open in the 
plating or a cold solder joint. I do not know. I have no way to test the caps 
for leaking so I do not know what the real problem was. I just stumbled on 
this fix. Inspection (eye balling) and test (probing with a meter) was not 
leading to a solution.

Roger AI4NI

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