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

[Cecil Acuff]

Looks great...

Not trying to be critcal but is there the recommended pre-load on those 
split gears...the springs all seem to be hanging fairly slack?

If not now is the time to fix it.  The tuning backlash probably wouldn't be 
noticed until the radio was on the air.

The RF decks tune very easily without the pre-load but have noticable 
backlash when tuning a carrier for zero beat for example.

May just be my eyes...

Otherwise it looks really good.

Cecil Acuff
K5DL
----- Original Message ----- 
From: <stevejxl at optonline.net>
To: "Jon Schlegel" <ews265 at rochester.rr.com>
Cc: <r-390 at mailman.qth.net>
Sent: Monday, June 29, 2009 12:11 PM
Subject: Re: [R-390] R-390A Rebuild.. More Pics.


> 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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