[Jukebox-list] Cleaning circuit board with DeOxit

[Ron Rich]

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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