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Well, to cut the long story short, send the whole thing to me and I will take care of it (I can even program the new processor at work if needed, I discovered we have programmer).
The values of parts are not critical, this is definitely not the cause of this drama.
In case you still want to do it yourself...
The 10uF caps are for voltage filtering (one for 5V) and the rest are in voltage converter (for RS232, it needs +10V and -10V).
Smoking-hot regulator means you have short somewhere.
Or one of those elcos was reversed during assembly...
First, remove the encoders, and measure the voltages. Check if something is hot... Maybe RS232 chip is damaged?
Then replace the regulator, if needed. Put some cooling fins on it.
But normally it will get hot, especially if your input voltage is higher and with encoders (they take significant portion of total current). I mounted mine on the bottom side of the board so it is in contact with metal housing, where I mounted the whole thing in.
Some time ago we discussed the availability of processor, they still have it in Jaycar...
Last edited by bojan; 21-01-2010 at 09:04 AM.
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