[R-390] Extra hole/cover plate - R390

[Jacques Fortin]

Ah...
This one !
I have no idea either...
Like a last-minute engineering change: they removed something from the design and used a blind plate over the hole made there for another circular connector ??
Even in the pictures in the first Collins manual (Oct. 1953) that blind plate is there.
And there is nothing mounted behind that plate.

Similar situation when a blank plate was put over the Squelch relay hole in the R-390A AF module.
Except that for the R-390A, all the required wiring is there, and the Function switch is locked to not go past the CAL position...

73, Jacques, VE2JFE in Montreal

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la part de Barry
Envoyé : 25 octobre 2022 13:39
À : Jacques Fortin <jacques.f at videotron.ca>
Cc : R-390 Mailing List <r-390 at mailman.qth.net>
Objet : Re: [R-390] Extra hole/cover plate - R390

The cover I'm talking about is the one just to the left of the fuse cover.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "n4buq" <n4buq at knology.net>, "R-390 Mailing List" 
> <r-390 at mailman.qth.net>
> Sent: Tuesday, October 25, 2022 12:01:11 PM
> Subject: RE: [R-390] Extra hole/cover plate - R390

> Barry,
> 
> Not sure this is what you are talking about, but I believe it is the 
> screw that hold the cover for the spare fuses.
> See pic. attached.
> 
> 73, Jacques, VE2JFE in Montreal
> 
> -----Message d'origine-----
> De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De 
> la part de Barry Envoyé : 25 octobre 2022 12:24 À : R-390 Mailing List 
> <r-390 at mailman.qth.net> Objet : [R-390] Extra hole/cover plate - R390
> 
> Looking at an ad for an R390, I noticed the cover plate in the 
> lower-left-rear has something sticking out of it (switch handle, pot 
> shaft, etc., ?) and that got me curious as for what that covered-up 
> hole exists.  I haven't found anything regarding it in the manuals 
> (not to say it isn't there, but I haven't found it).  Anyone know?
> 
> Thanks,
> Barry - N4BUQ
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