I plug it in, hit the switch, and the leds flash bright and then fade away. It happens pretty fast,
shall I also add a thermal fuse there?
the reason the fuse didn't blow is there WASN'T a fuse there, I guess it was wired together with solder wire, and by excessive heat it just melted. It doesn't look like there was any sparks or any explosion, there's no blackness anyhere, just some wires that did'nt even look like they had to be connected.What about an easily replaceable fuse? If there is one then it should have blown. Is there some reason it did not?
This depends on whether the failure was caused by excessive heat, or excessive current. If you can track it down then you know better what is the proper type of circuit protection you should install.
Okay, the transformer says it delivers 35w on 2x18.5v.If it didn't have a thermal fuse before I wouldn't think adding one now would make it safer. Usually, if a thermal fuse blows there is plenty of evidence of overheating such as brown 'burn' marks or discoloration of the wires. They do not work by overcurrent but by overheating and even a low temperature one takes long enough to pop that there is normally other evidence of cooking nearby.
If you want to add a fuse, I would add one in the green wire but outside the transformer. Snip the wire and add an in-line fuse holder with a normal replaceable glass fuse. Without knowledge of the circuitry I can't be sure of what rating to use but if this is only a mixer unit, the current consumption would be quite low, maybe 0.2A or so. If you added a 1A anti-surge (time lag) fuse it should be adequate.
Brian.
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