[R-390] backlash on R390A

[Barry Hauser]

Hi Jon

I might know a thing or three about ATC -- I took over the R-390A (and some 
other type) parts inventory on consignment.  While you can order through the 
ATC website, better to just directly email me as it avoids delay.

The RF decks are as pictured -- missing all the coils, slug racks and a lot 
of other parts, but virtually all the gears and clamps are there.  Some have 
a few slugrack springs still hanging on.  They also have (mostly) good 
Veeder-Root counters, however the thin aluminum masks are a bit mangled on 
most all of them.

I doubt if either the missing Oldham coupler spring or slugrack spring has 
anything to do with the backlash you previously described.  The spring on 
the coupler just takes up some residual slop between the gear train and the 
PTO and is basically and anti-rattle spring.  The missing spring on one slug 
rack might tend to cause that slug rack to hang up on the downstroke, but 
unlikely to be the culprit.  If anything the backlash originates from the 
pull of the backlash springs, so one less  ...?

Did you check for a broken or loose gear clamp as I/we described?

You have to work the KC through full cycle and watch two or three things at 
a time as you do, especially at the points where that backlash occurs.  I 
think what you told us was that the KC knob actually spins back a bit, 
right?  That's more of a recoil (as in recoil starter) than backlash, which 
is a slight creeping off the set frequency.

Barry


----- Original Message ----- 
From: "Jon" <jonklinkhamer at comcast.net>
To: <r-390 at mailman.qth.net>
Sent: Sunday, August 28, 2005 9:11 PM
Subject: [R-390] backlash on R390A


>
> Hi Folks,
>
> This weekend was a crash course on the RF Deck. After reviewing the
> manual(s) and Chuck's video, I finally got enough nerve to take out the
> deck. Two things I immediately noticed. First the spring for the Oldham
> Coupler is missing - gone. No I did not do it - really. Also on one of the
> slug racks a tension spring is also missing. These especially the former
> might be the perpetrator of why I'm seeing so much backlash. I'm now at 
> the
> mercy of finding parts. I don't necessary like that feeling but it goes
> along with repairing/restoring boatanchors I guess. I noticed 
> www.atc-us.com
> <http://www.atc-us.com>  is selling a deck for $35. I'm thinking I might
> need the gears and clamps depending on what I find. Does anyone have much
> experience dealing with this company? Is there anybody in the group that
> could sell me an anti-backlash and tension spring(s)? Being always the
> optimism, I feel good that this may solve the problem.
> PS: While cleaning the dirt off the chassis where the RF deck was I 
> noticed
> a message scribed into the metal. It read "Bud was here 30 Nov 69"   Bud 
> if
> you're out there thanks for serving and God bless you!
> 73's
> Jon,KB1DC
>
>
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