[R-390] Cleaning modules

[Barry Williams]

Ammonia works well too. I found it to work better when restoring an old 
Fisher 800B receiver unit.


Barry


> At 08:19 PM 11/2/2007, you wrote:
>> Simple Green?  Is it a common cleaning product?
>
> Jon, and would-be Simple Green users,
>
> Yes, it is a common cleaning product. And no, you really should not 
> use Simple Green:
>
> The Army aviation repair establishment published a maintenance note in 
> their magazine oriented toward aircraft mechanics to the effect that 
> Simple Green had been tested and shown to create corrosion in aluminum.
>
> A couple of observations:
>  - We may think we are rinsing well, but some of the cleaner may still 
> be deep inside crevices and between parts that can't get a good flow 
> of fresh water.
>  - The modules in the R-390 are not Army helicopters and they 
> certainly don't cost as much and are not depended upon to preserve the 
> lives and limbs of people who use them
>
> Sooo.. if you like Simple Green, go ahead.  Just let me know if I am 
> tempted to buy one of your radios.
>
> Restorers I know use a 50-50 mixture of 409 and household ammonia. The 
> R-390/URR and R-390A/URR modules I cleaned not too long ago look new.
>
> - apply with a squirter, brush vigorously with a paint brush, or parts 
> brush.
> - rinse well with lots of water
> - dry with moderate heat (the summer sun in Arizona, or your oven at 
> 120 degrees - convection ovens work great!)  Heat lamps or just plain 
> lamps placed close and a small fan will do.
> - re-lubricate EVERYthing, and treat all switches with Caig De-Oxit 
> (and pots with Caig MCL if they are not sealed shut).  Accept no 
> substitutes, they have new names now, see www.caig.com for details and 
> a trial kit of small tubes.
>
> Remove all modules from your R-390x radio. Remove the RF deck and 
> remove all the slug racks and transformers.  Wash everything as above. 
> The meters are sealed so don't worry.  Your radio will look like new.
>
>>  BTW, I'll make a note about the power thing.
>
> Make sure you have a three wire line cord while you are at it.  Put in 
> an inrush current limiter.
>
> Roy
>
>
>
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
> 13033 Downey Mill Road, Lovettsville, VA 20180
> Phone 540-822-5911   Cell 301-928-7794
> Work: Voice: 301-975-3254,  Fax: 301-975-6097
> roy.morgan at nist.gov -- 
> _____________________________________________________________