[ARC5] SCR-274 series screws question

[Michael Hanz]

In the SCR-274-N maintenance manuals there is a section on "Servicing 
faulty receivers" that provides a sequence of removal of various parts, 
distinguishing the screw colors as "bright" and "black".   In the T.O. 
No. 16-40SCR-274-5 that was revised 25 July 1956 , it's page 49.

73,
Mike  KC4TOS

On 4/20/2024 7:59 PM, hwhall--- via ARC5 wrote:
> Hi, Dave!  The screws I'm looking at are all the externally visible 
> ones, when everything is assembled.  They don't appear to have been 
> put on randomly -- the darker ones I've noticed so far are only those 
> securing that "top cover" underneath the rim of the front panel plate 
> (the top cover has slots to allow removal of the cover without fully 
> extracting the darker screws).  It looked like they might have been 
> deliberately done.  But if it's likely not original, then I don't have 
> to consider whether to have darker screws at the ready.
>
> Wayne
> WB4OGM
>
> On Saturday, April 20, 2024 at 05:40:44 PM MDT, David Stinson 
> <arc5 at ix.netcom.com> wrote:
>
> On 4/20/2024 6:10 PM, hwhall--- via ARC5 wrote:
> > Some of the SCR-274-N receiver sets I'm working with have silver 
> colored
> > screws in some exterior places & darker colored (almost black?) screws
> > in other exterior locations...
>
>
> If you remove the top cover of a 274N (or ARA, ARC-5)
>   receiver, you see an internal shield over the tuning
> capacitor.
> The black screws bypass the top cover and screw
> into receptacles holding this internal shield in place.
> By removing just the "silver" screws, you can pull
> the top cover without disturbing the internal shield.
> Receivers which have been disassembled and reassembled
> are often put back together with mixed screws.
>
> GL OM ES 73 DE Dave AB5S
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