[CQ-Contest] ALL TS-930 Fix(ers) PLEASE READ

[Tom Hammond]

Hi Guys:

Just received this from Mauri, I4JMY.  Thought it a good idea to post
here.

Thanks Mauri!

73 - Tom Hammond   N0SS

>Date: Thu, 28 May 98 17:15:39 +0000
>From: i4jmy at migate.n8it.AMPR.ORG
>To: n0ss at sockets.net
>Subject: Re: [CQ-Contest] TS-930 Fix
>
>   Hi Tom,    
>  
>    In the 80's we have done in my lab a number of repairs of TS930
>  digital units, of course we had that "56 points guide" but after
>  some time we decided not to use it other than as a guideline, and 
>  to repair only, often jumpering between components leads leaving 
>  untouched the board, were effectively defective.

>    That boards (up to SN 310XXX) are so defective and delicate, also 
>  suffering of aging, that any unecessary stress must be avoided, 
>  otherways new problems add to the existing ones (at the time of 
>  repair or in the near future) making finally the damage unrepairable
>  at a reasonable cost.

>    Moreover, not all the problems came from the through holes, but 
>  often by copper tracks breaks (around components soldering points).

>    Generalized resoldering of the through hole points, expecially
>  by not thermo-controlled iron solders, I can bet, will cause new 
>  breaks in most of the digital boards.

>    If I were You, to live in peace, I'll warn people about concerned
>  risks and expecially NOT to resolder all those 56 points as an 
>  unconditioned fixing (or preventing) action.

>    My experience says this repair shouldn't be done by who is not
>  a professional.
>
>    
>    73, Mauri I4JMY


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