Fuse located inside the Yamaha SY-1

Post by **nsbhp2** » Tue Oct 10, 2006 1:07 am

Hi, all! Newbie to the site here, with a quick question. I recently purchased a Yamaha SY-1 off eBay (a STEAL @ $60 incl. shipping!!), and had it open the other day and saw that there is an old style tube fuse in a holder. When I pulled it out, I noticed that the filament was broken. Now, the synth seems to function OK, so what is the fuse for? Any help would be GREATLY appreciated!

Peace!
Scott

Post by **Maschinengeist** » Tue Oct 10, 2006 5:21 am

The fuse is there to prevent current overload. So if an electric problem arises, the fuse will take the blow instead of the components.

The synth will work without one but it's not safe... The synth can fry and there will be nothing to prevent it. That why fuses blow!

Hope that helps

Post by **nsbhp2** » Tue Oct 10, 2006 5:33 am

Maschinengeist wrote:The fuse is there to prevent current overload. So if an electric problem arises, the fuse will take the blow instead of the components.

The synth will work without one but it's not safe... The synth can fry and there will be nothing to prevent it. That why fuses blow!

Hope that helps

Yeah, I understood the basic electrical use of the fuse, I just didn't know if it was for the entire synth or maybe one specific sub-part. But, obviously it needs to be replaced before I delve further into this beastie. Thanks for the reply, Maschinengeist!

Peace!
Scott

Analog Freak · Post by **Analog Freak** » Tue Oct 10, 2006 5:42 am

machinegeist wrote:The fuse is there to prevent current overload. So if an electric problem arises, the fuse will take the blow instead of the components.

The synth will work without one but it's not safe... The synth can fry and there will be nothing to prevent it. That why fuses blow!

Hope that helps

Wrong. A fuse is used in a device to prevent additional damage after a short or because of a voltage spike. It doesn't reactact fast enough to protect against the initial problem, especially if it is the slow-blow type. A fuse will not pass current if it is blown, so anything that looks broken , but that passes juice probably isn't blown. A synthesizer will not even power on if a fuse is blown, nothing electrical will work without a steady flow of electrons. I would replace the fuse just to be safe, but the odds are, if the thing works properly, I don't see why it would be nessesary to swap out the fuse.

Post by **Maschinengeist** » Tue Oct 10, 2006 6:11 am

What I meant is that it's possible to make the synth works without one by mean of bypassing (I've seen it before and go figure why)... In my hurry, I thought I read that the fuse (well, the holder) was disconnected from the circuit...

Usually the fuse is for a section of the board. BUT by clowing cuts the circuit, i.e. the flow of electricity and "turns off" the whole synth.

Thanks Analog Freak for correcting me. I wrongly read the initial post.

Analog Freak · Post by **Analog Freak** » Tue Oct 10, 2006 6:39 am

Oh yeah, bypassing the fuse is pure genius. I've seen it cause quite a few failure modes, and more than a few fires.