My fellow electrical-electronic slueths,
Back in January I started a thread which could have been a potential solution for described needed functions on a brand new printed circuit board. I am hoping that you can have that open in a separate window as a reference.
http://forum.allaboutcircuits.com/showthread.php?t=48762
The reason for the new post is there is another approach to the solution to our problem. Hopefully I can get input with this post on the possibility of repairing an existing board that has all the functions I need --- described in the above January post. The company that sold me the board back in 1987 say that is was made by another company that they don't remember. Hopefully, with the below link to pictures of the board you folks can help me pick out a broad enough range of a triac that the odds of success will be greater. I am thinking that the only component that can cause "an output & its corresponding LED to stay on" ---- even at start up --- would be a triac that finally fused or whatever. Another thing that complicates this process is the fact that the board was sprayed with a waterproofing clear coat. Anybody have experience with replacing a triac on a board that had waterproofing spray? I do have a temperature controlled grounded tip lab grade soldering station if that helps. Notice the small black components that are parallel to the specific LEDs in the pictures on the following public link. The black components (triacs?) have the following printed on them: R P1 0181 ECB if that helps to find suitable replacement triacs. Since 7 of the 10 boards that I have --- have been working perfectly with continuous use since 1987 it shows that the board was reasonably well made & could last for another 24 years it seems --- especially with a proper hopefully minor triac replacement repair on rare occasions.
http://www.mediafire.com/kingkoinmike#1mct4rf78mm5x,1
It would be a shame if we can't solve this problem because this distribution board allows us to have a much more user friendly interface with our self service car wash users than the much more common less friendly triple deck rotary switches. This board or a similar board like Ken Moffett almost made back in January --- allows for the users to see that the latched on selection & output is lit up when selection is made & it allows for 12 IP69 vandal resistant momentary buttons. I've already bought well over a hundred of the spendy stainless button switches from Digikey last fall --- so I am plenty nervous about making this work without too much delay! Thanks for any assistance or suggestions & I will do my best to reciprocate in as good a faith way as possible!
Mike
Back in January I started a thread which could have been a potential solution for described needed functions on a brand new printed circuit board. I am hoping that you can have that open in a separate window as a reference.
http://forum.allaboutcircuits.com/showthread.php?t=48762
The reason for the new post is there is another approach to the solution to our problem. Hopefully I can get input with this post on the possibility of repairing an existing board that has all the functions I need --- described in the above January post. The company that sold me the board back in 1987 say that is was made by another company that they don't remember. Hopefully, with the below link to pictures of the board you folks can help me pick out a broad enough range of a triac that the odds of success will be greater. I am thinking that the only component that can cause "an output & its corresponding LED to stay on" ---- even at start up --- would be a triac that finally fused or whatever. Another thing that complicates this process is the fact that the board was sprayed with a waterproofing clear coat. Anybody have experience with replacing a triac on a board that had waterproofing spray? I do have a temperature controlled grounded tip lab grade soldering station if that helps. Notice the small black components that are parallel to the specific LEDs in the pictures on the following public link. The black components (triacs?) have the following printed on them: R P1 0181 ECB if that helps to find suitable replacement triacs. Since 7 of the 10 boards that I have --- have been working perfectly with continuous use since 1987 it shows that the board was reasonably well made & could last for another 24 years it seems --- especially with a proper hopefully minor triac replacement repair on rare occasions.
http://www.mediafire.com/kingkoinmike#1mct4rf78mm5x,1
It would be a shame if we can't solve this problem because this distribution board allows us to have a much more user friendly interface with our self service car wash users than the much more common less friendly triple deck rotary switches. This board or a similar board like Ken Moffett almost made back in January --- allows for the users to see that the latched on selection & output is lit up when selection is made & it allows for 12 IP69 vandal resistant momentary buttons. I've already bought well over a hundred of the spendy stainless button switches from Digikey last fall --- so I am plenty nervous about making this work without too much delay! Thanks for any assistance or suggestions & I will do my best to reciprocate in as good a faith way as possible!
Mike