Apologies if this is in the wrong forum. I could not find a forum suitable here for a Model D but assumed this would be a good place to ask.
I just imported a Model D from the U.S to Australia. I connected it to a 240VAC to 115VAC step down transformer but it is not powering on (power light is not turning on, no sound, etc)?
I’m wanting to check the AC fuse (one with the red cap) but I have no idea how to remove it from the mini. The DC fuses are simple twist mechanisms, and come out easily, but I cannot work out how to remove the AC fuse from its socket. How do I do it?
Also, the mini I have is switchable between 115v and 230v. Would I need to replace the AC fuse in order to power it under 230VAC.
I don’t know much about Mini’s but I do know a lot about general electronics. If you switch the power supply to 230V, you don’t need a transformer and it should function properly, provided you are using the correct plug…if it is a good Minimoog, that is.
can you take a pic of the AC mains fuse holder?..we might be able to figure it out for you.
regarding fuse ratings, printed on some guitar amps, they’ll specify a 4 Amp fuse seeing 120V power needs to be dropped to 2A at 230V. I’m not sure if the mini needs the same treatment, but it wouldn’t hurt to put in a lower (by half) rated fuse than what’s in there. lower is OK, higher is not.
You can see that the two DC fuses on the right have twist mechanisms but the AC fuse on the left does not (Red cap). It does however have a flat screw indentation on the top, but I am unsure if this is actually for screwing it. Rather than risk damaging it I’m sure someone on here would know how to access it.
Many thanks for the replies and suggestions, I appreciate the help!
the red cap is hollow inside with enough room to accomodate the metal end of the fuse…like the black DC fuse holders, only smaller and set inside the black collar. you need to get a grip on the black collar to keep it from turning while you twist the red cap with your screwdriver
Just FYI in case all of your fuses are good. My Minimooog quit working many years ago. The fuses were good and it turned out one of the 4 diodes in the power supply had gone bad. I replaced all four while I was at it and it worked great again.
Well… I couldn’t remove the fuse. I opened up the mini. Removed 2 cards. Lone behold the fuse holder had actually been broken in two, making it impossible to unscrew the AC fuse.
I rewired the fuse up but still no power on. I am now thinking the problem must lie elsewhere.
JohnLRice were they the regulator diodes? Is there any test I can do to see if they would be causing the problem?
I’m about to probe the regulator board now to see if any voltage is actually getting through, but it doesn’t seem that way.
The mini was unfortunately not packed very well, so a damaged component could be a possibility.
The diodes are pretty standard power variety (they are larger black plastic not the small clear glass ones.) It’s a very basic good old diode ring + electrolytic cap and regulator power supply. I haven’t looked at it years but I have been meaning to open it up to fix a different problem so I’ll try t get to it this weekend and tell you what some readings are at different points on mine. (Unless Kevin Lightener jumps in and tells you first! )
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