[Jukebox-list] Cleaning circuit board with DeOxit

[Don]

Hi Ian,
I am not an industrial chemist but here is my 2 cents worth.

With that much greasy stuff on the PCB I suggest a two part cleaning 
process.
First, spray with hot TSP solution to cut the grease and wash it away.
    Use a spray bottle of some sort to squirt it onto the PCB. The spray 
action should help move some of the gunk off the PCB.  If you have access to 
a compressed air nozzle, a shot of compressed air around the on-board chips 
should help force the TSP under the chips and thereby help get the whole PCB 
clean.
Second, spray the PCB with 70% IPA to "rinse" the TSP residue off the PCB. 
Repeat several times. Use compressed air to blow off liquid and dry the PCB. 
Also maybe finish drying process with a hair drier. You can get the PCB warm 
but not too too hot.
I've done this successfully many times.

Hope this helps.
Don




----- Original Message ----- 
From: "Ron Rich" <ronnnrich at yahoo.com>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Tuesday, February 13, 2007 8:18 AM
Subject: Re: [Jukebox-list] Cleaning circuit board with DeOxit


> Ian, I would attempt to clean it with a "safety solvent".  The one that I 
> use is made by CRC, called "Letro-Motive" and is available in hrdwr stores 
> and auto stores. One caution when using this product--it will destroy 
> "plastics", therefore I never spray it into/onto anything. There are other 
> "plastic safe" products available (at a much higher cost) that I use for 
> anything that I MUST spray, but the LM does a good job in most cases. 
> Should that fail, my second suggestion is to try "sudsy ammonia".  Put a 
> closth pin on your nose while using it !
>
> Ian Zapczynski <ianzap at hotmail.com> wrote:  I have a Rowe MM-1 which more 
> often than not makes incorrect selections. It
> almost always selects the proper letter, but either it will push the pin 
> for
> the wrong number or it will just continuously search. The very kind and
> helpful Justin S. helped me narrow this down to the number wiper circuit
> board, which is quite visibly contaminated.
>
> Per his suggestion, I used some DeOxit (at first a 5% solution I borrowed
> from a friend) on the board, and with this I managed to remove a small
> amount of the muck. After letting everything dry, I tested the unit and
> felt that I had made noticeable progress, but still much of the time I was
> encountering the same selection issue. So I bought myself a 100% DeOxit
> solution with a brush applicator and applied it as directed last night
> (apply, wait 2 minutes, wipe with lint-free cloth and continue until cloth
> is clean). Unfortunately, I was unable to successfully clean off any more
> of the apparent contamination this way. I also tried removing the gunk 
> with
> a pencil eraser to no avail.
>
> To be clear, this "gunk" I refer to seems to not be on the surface but
> instead embedded in the conductive connectors on the board. It appears 
> dark
> grey. I'm not sure if this is what oxidation looks like or if this is some
> other contaminant, but it quite obviously exists only in places where the
> wiper has come in contact with the board.
>
> In any case, it would seem to me that this board is causing my issue, but 
> I
> don't seem to be getting very far by cleaning it in this manner. Is there
> any hope? Does anyone have any additional thoughts or suggestions on how
> to get this board in more of a like-new condition? Or (*gulp*) might I
> need to resign myself to locating another one in better condition? I'm
> usually a bit paranoid about breaking things, but in this case I think 
> I've
> put in about as much elbow grease as this application would allow.
>
> Thanks!
>
> -Ian
>
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