Sound cutting out suddenly with no warning

[mcooper1002]

I've had my SV1 for less than a year, and last night on a gig the sound quit completely in the middle of a song. All the lights remained on. I checked the patch cables, etc. and when all looked solid, I switched the power off and on again. This restored the sound and I had no more problems the entire night.

This is unnerving....has anyone had a similar problem? Our nearest service center is at least two hours by car.

[musicbox]

yeaa, actually mine has done this twice. worried the crap outta me, only thing i've discovered to do is exactly what you have. just switch off and on, then sound comes back on. i'd like to hear Korg's explanation. . .

[Thunder]

What OS are you running?
Update to the latest!
http://www.korg.com/uploads/Download/SV ... 860000.zip

[dyndragon]

Mine just did that in a set over the weekend on Saturday. Then Sunday morning it even decided not to boot for a while. I am running 1.2!

[ShaunKorg]

I remember this happening at a gig. I turned it off and on and the sound was back. Later I repeated the error at home by accident. The cable for my expression pedal wasn’t plugged in all the way. I think it was sending a “volume off” signal or something. When I shoved it all the way in everything was normal. I had that unit for several months after that with no problems.

So if you use an expression pedal check the cable.

[dyndragon]

I remember this happening at a gig. I turned it off and on and the sound was back. Later I repeated the error at home by accident. The cable for my expression pedal wasn’t plugged in all the way. I think it was sending a “volume off” signal or something. When I shoved it all the way in everything was normal. I had that unit for several months after that with no problems.

So if you use an expression pedal check the cable.

You are somewhat correct, or at least my problem was something related to the expression pedal as well.

I use a Roland EV-5 expression pedal, and apparently when I have it plugged in, the SV-1 will not boot up if it has been powered down for more than 1 minute. If I power it up, and then power down, then waiting less than 5 seconds and power it up again, the SV-1 will boot!

It's very strange. This is exactly what I have observed and am able to repeat reliably--

With the expression pedal plugged in:
- Cold power up (turned off for at least 1 minute). Light behind tube flickers on. No other lights turn on.
- Turn off unit. Wait 3 seconds.
- Turn unit on ("warm" start). Light behind tube comes on solid (no flicker). Unit boots as normal.
- Repeated "warm" starts result in normal boots.

Without the expression pedal plugged in:
- Cold power up. Light behind tube flickers on.
- Unit boots up normally.

What I have not been able to reproduce again is the sudden loss of output during a gig, but I would suppose it could be related to this expression pedal.

I'm going to try to get the official Korg expression pedal EXP-2 or XVP-10 to see if I get the same problem. Maybe my pedal is bad?

[ShaunKorg]

The expression pedal kind of annoys me in general. When you switch sounds it forgets how far the pedal is depressed. Even with the pedal all the way up (no volume) the new sound is at full volume until you move the pedal again.

I also had the sound cut out when I mixed up my expression and rotary control pedal inputs. Since the rotary pedal is just on/off as soon as I hit it the sound went dead. At least that time I figured out what happened right away.

[dyndragon]

I'm still trying to think about this...

During my gigs over the weekend, I didn't even have the expression pedal plugged in! I just remembered now, because I had a Nord Electro 2 I was using as my organ, so the expression pedal was plugged into that. I don't get how this makes any sense...

Maybe I should just get an exchange....still within 30 days of purchase.

[dyndragon]

Could I just get some confirmation on the expression pedal strangeness? I just want to make sure that no one else is experiencing what I experienced with the expression pedal.

I've now tried a Roland EXP-1 and the official Korg XVP-10 expression pedal with the same results--plugged in, the SV-1 does not boot up successfully, but unplugged I have no problems.

I just want to make sure that this indeed is just my unit before I go through the trouble to get it replaced. If you all who are using expression pedals could just confirm with the make/model of your expression pedal and have no issues.

Thanks!

[SanderXpander]

Does your expression pedal behave normally otherwise? No weird jumps in volume? How about if you jiggle the plug gently? I had a similar situation on my Triton Extreme where the volume would jump and be generally unpredictable. Thought it was the pedal, turned out to be the internal solder connection for the expression pedal input. If the connection is bad, it could trigger a 0V even without a pedal plugged in.

[dyndragon]

Does your expression pedal behave normally otherwise? No weird jumps in volume? How about if you jiggle the plug gently? I had a similar situation on my Triton Extreme where the volume would jump and be generally unpredictable. Thought it was the pedal, turned out to be the internal solder connection for the expression pedal input. If the connection is bad, it could trigger a 0V even without a pedal plugged in.

Yes, otherwise the expression pedal behaves normally. Even if that were the case for sure I would want a replacement since it is less than 30 days old. Anyway, that's what I'm going to do-- get a replacement from where I bought it.

Thanks for the suggestion though!

[mcooper1002]

I've had my SV1 for less than a year, and last night on a gig the sound quit completely in the middle of a song. All the lights remained on. I checked the patch cables, etc. and when all looked solid, I switched the power off and on again. This restored the sound and I had no more problems the entire night.

This is unnerving....has anyone had a similar problem? Our nearest service center is at least two hours by car.

I finally took my SV1 to a Korg service center. It turns out the power supply was bad. After the power supply was replaced, it appears to work fine (although the unit was out of warranty by a period of only a few days, so it cost me $211). However, since then a couple of times when I was playing hard, the patch changed suddenly from # 2 or 3 to #7 or 8--weird...

[dyndragon]

I've had my SV1 for less than a year, and last night on a gig the sound quit completely in the middle of a song. All the lights remained on. I checked the patch cables, etc. and when all looked solid, I switched the power off and on again. This restored the sound and I had no more problems the entire night.

This is unnerving....has anyone had a similar problem? Our nearest service center is at least two hours by car.

I finally took my SV1 to a Korg service center. It turns out the power supply was bad. After the power supply was replaced, it appears to work fine (although the unit was out of warranty by a period of only a few days, so it cost me $211). However, since then a couple of times when I was playing hard, the patch changed suddenly from # 2 or 3 to #7 or 8--weird...

I just got my replacement SV-1 today, and it definitely doesn't exhibit the problem I described earlier (flickering light on power up). Maybe they had a rash of bad power supplies? What was your unit's serial number?

[JWO]

I had this problem of the sound cutting off during a gig and having to turn the SV-1 off and on to get sound again. I finally figured out that my fingers had hit the Local Off button (which cuts off the internal sounds) during playing. I've also accidentally hit the numbered patch buttons and changed the sound while playing.

[oy5t3h]

There's a few buttons that are easy to hit by mistake.
Managed to inadvertently turn on the transpose button in rehearsal yesterday, and played a few bars one semitone sharp.
If nothing else, it proved the guitarist is not as completely tone deaf as I had thought!