[R-390] R-390A Rebuild.. More Pics.

[stevejxl at optonline.net]

Hi Jon!
 
Rebuilding the RF deck was TOTALY worth it!
A coulple of things I learned that I will apply to radio #2:
 
Before disassembling anything, take as many hi-resolution photos of the gear train from various angles in every stage of disassembly as possible. I referred to them many times to confirm the placement and location of the many small shims and washers.
 
When removing a gear/no-mar clamp/washer/shim assembly for cleaning, I used a short length of bailing wire and "threaded" the parts on in assembly order, then twisted the wire ends together. Not only did this keep the assemblies together (especially the shims and washers!), but provided a way to easily dunk whole groups of small parts in the Carb Cleaner/De-greaser basket.
 
I also found that gently cleaning the center of the slugrack coilforms with q-tips and 90% isopropyl removed waxy dirt/grease allowing the slugrack to move much more freely. 
 
Good luck!
 
 
Steve 
 
 
 
 
 
 
 
 


----- Original Message -----
From: Jon Schlegel 
Date: Monday, June 29, 2009 9:35 am
Subject: Re: [R-390] R-390A Rebuild.. More Pics.
To: r-390 at mailman.qth.net

> Hi Steve and List,
> 
> Wow! Looks great! The RF deck is my next task on my Motorola. 
> The 
> photos of your excellent work gives me more confidence to tackle 
> the 
> RF deck (all those gears!). Good deal on cam alignment. I've 
> heard 
> that there's a lot of commonality in the 390A slugs so it seems 
> scrounging one shouldn't be a problem. I have no spares 
> otherwise I 
> could offer to help out.
> 
> Best regards,
> Jon WA3MVM
> 
> 
> At 09:16 AM 6/29/2009 -0400, Optonline wrote:
> 
> >Hi All!
> >
> >After a bit of work, I finally finished the re-build of the RF 
> Deck this
> >weekend, and I've attached a Flickr link to some photos.
> >In retrospect, it really was not that bad at all. While I have 
> no parts left
> >over :), I did discover I am short one slug-rack spring. Arrgghh.
> >
> >http://www.flickr.com/photos/39242405@N06/sets/72157620566596083/show/
> >
> >The synchronization of the cam alignment, MHz detent, 
> bandswitch, and
> >crystal osc. is perfectly spot-on, with exactly 35kc over-run 
> on each end of
> >the dial. The tuning is now incredibly smooth.
> >Every Erie trimmer was disassembled and cleaned, and in some 
> cases, replaced
> >due to cracked ceramic disks. This was the most time consuming 
> effort.>
> >With most everything cleaned up, I will begin the electrical 
> makeover with
> >a massive re-cap session over the next few days as time permits.
> >
> >I'll post more soon..
> >
> >Steve N2JXL
> >
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