Hi there,
Just found out on my TFTC that the kickback was not working => F9 blown, changed it => kickback always on
ok, changed Q4 on the Solenoid Driver board => now my R16 is blowing up as soon as I switch the machine on.
Any idea of what could be the cause and where to look? Have no seen any short 
Kickback coil resistance was around 3.2 Ohms
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Chénens
Lake Elsinore, CA