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If you have power to a circuit (you can tell with a multi meter), and it does not do what it is supposed to it is bad. Make sure the fuse is good. If fuses keep blowing then there is too much current, which is usually indicative of a short. If you see smoke, there's a good chance you're circuit is bad. An electronics book will tell you what to look for if you are trying to troubleshoot a circuit board. Many times the board will need to be replaced as individual components are too small and impossible to get at to change.

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15y ago

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