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Quoted from Blackbeard:Won't a bad diode blow a fuse?
If the diode is shorted, yes. If open, possibly but usually no.
Quoted from Atomicboy:Heating up one lug, and pulling it out to test is much faster than replacing it.
If there is enough lead length, and usually there is, you can cut one lead, measure, then if good re-solder the leads together.
Quoted from Blackbeard:So here's my diode dilemma. I brought home pinbot and noticed a sling not working. I checked it out and a wire was yanked from one of the lugs.. so i resoldered and upon turning on, the coil locked. Sent boards to coin op for repairs thinking transistor.
Should I be concerned with the diode on that coil too?
If the coil locked, this shows it can turn on so it is probably good. You may have a shorted drive transistor causing this lock on condition. The wire may have been yanked due to the coil locking on.
You should check your coil and diode easily enough following the instructions in this thread. This will tell you for sure if your coil and diode are OK or defective.
Quoted from pinballfan:the bad diode can give a switch matrix problem??
Not if on the Flipper coil. If the diode is on a switch, yes it can cause a switch matrix problem.
Quoted from stangbat:After I buy a game and get it home I don't even fire it up again until I've gone through all the fuses.
Very good preventative maintenance!
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Boston, MA