[R-390] Variable Caps

[JMILLER1706 at cfl.rr.com]

Yes they can be disassembled and cleaned - carefully.  The three-
pronged spring thing under the circuit board slides into a groove on 
the shaft, it can be gently pulled away from the shaft with needle nose 
pliers, even withour de-soldering.  Then the rotary part just lifts 
out, and you can clean the surface with denatured alcohol.  And clean 
the metal parts with deoxit and a tooth brush.  Alternately, just dab a 
very small amount of deoxis onto the shaft where it is held by the 
spring piece and rotate it a few times to clean off any corrosion.  Jim 
N4BE

----- Original Message -----
From: DW Holtman <future212 at comcast.net>
Date: Friday, October 7, 2005 4:10 pm
Subject: [R-390] Variable Caps

> Hello,
> 
> Is there a way to clean the variable caps in the Rf transformers 
> located in the RF Module. They look like they cannot be dis-
> assemblied, they look sort of sealed with a rubber looking 
> gasket/seal around the bottom of the top ceramic part, under the 
> adjustment screw. The shaft extends through the board to the 
> solder connections. Is there a good way to clean these caps?
> 
> Thank you in advance for any information.
> 
> 73's
> DW Holtman
> WB7SSN
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