[R-390] replacing components

rbethman rbethman at comcast.net
Fri Feb 20 13:10:56 EST 2009


I agree!  There are times that simply desoldering, using either a solder 
sucker and/or wick leaves you with situations where you have no support 
any longer.

The "large" oil filled cap on the IF deck, if not up to par, leaves you 
with:

1)  Performing an N4BUQ machining problem.  (Barry -- Fine job!)

2) Leave the cap in place.  Solder a replacement under the deck - BUT - 
without using the "bad" cap's terminals.

I've procured new stand-offs, soo when the old ones break, I "can" 
replace them as needed.

It is a '51 "contract" Collins R-390A St. J's "blue-striper".  These 
things have issues!  I've had to procure a "spare chassis".  The 
"finger-stock" riveted to the chassis was corroded badly.

I use a Weller station that is variable.  YMMV

The quiggle idea is NOT my first, second, NOR third choice.  It is a 
last ditch effort!

Bob - N0DGN

wli wrote:
> Geee, this is all so complicated! I just carefully clip as much wire as possible near flush with the lug joint, including wire that was wrapped around the lug. Heat it up, and all of it falls off leaving a clean lug.
>
> The new component's lead gets securely fastened mechanically by wrapping it 270-360 degrees around the lug, and a fresh solder joint completes the electrical connection.
>
> W. Li
>   

-- 
Bob - NØDGN



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