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Post new topic Goodrich H10K off when full on
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Author Topic:  Goodrich H10K off when full on
Lynn Oliver


From:
Redmond, Washington USA * R.I.P.
Post  Posted 19 Jul 2010 2:55 pm    
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I've had my H10K a while, but haven't used it much so far. Today I noticed that sometimes when I push down on the pedal for full volume I have no signal at all. If I let up on the pedal and then push it down again it usually seems to be OK. I have not noticed any failures at less than full volume.

With it in failure mode (pressed down, but no signal coming out) I verified that the string is not slipping and it's not a cable problem.

Any ideas?
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Danny Hullihen


From:
Harrison, Michigan
Post  Posted 20 Jul 2010 3:22 am    
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Lynn. It sounds like the wiper is traveling a bit past its capacity in the pot, and hence, is no longer making contact. You might want to try adjusting the pedals full on stop point.
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Lynn Oliver


From:
Redmond, Washington USA * R.I.P.
Post  Posted 20 Jul 2010 10:54 am    
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Danny, that is a good thought. But I manually turned the pot all the way on, and volume increases all the way to the stop. I also have it adjusted towards off, so that it is completely off when up and doesn't get that close to the stop when down.

I had fits getting the string locked around the post when I changed the pot, but I'm going to redo it anyway and see if that fixes the problem.
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Bobby Bowman

 

From:
Cypress, Texas, USA, R.I.P.
Post  Posted 20 Jul 2010 3:50 pm     Vp
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There should be a rubber stop pad to keep it from grounding itself,,,,if one is not there, you'll have to make up one/something to keep it from grounding out. Electrical tape, drawer pads,,,anything to keep metal from metal.
BB
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Lynn Oliver


From:
Redmond, Washington USA * R.I.P.
Post  Posted 20 Jul 2010 3:58 pm    
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Bobby, I'm not sure what would be grounding against what. There is a rubber pad inside the moveable part of the pedal that appears to bump against the side of the pot when the pedal is fully depressed.

I readjusted the string to get a bit more volume, still without bumping the stop in the pot. I couldn't see anything wrong with the string to start with, but the pedal hasn't acted up today yet so I'll have to see.
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Bobby Bowman

 

From:
Cypress, Texas, USA, R.I.P.
Post  Posted 20 Jul 2010 8:31 pm     VP re
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It's been a long time since I've done any serious work on a volume pedal. But, I seem to recall a rubber type pad, maybe 1/8" thick or so, that the bottom of top part of the pedal hits against when fully depressed. The one 10K Goodrich pedal that I had years ago did the same thing yours did.
BYW, it was a great pedal,,,kinda wish I still had it.
BB
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Jim Smith


From:
Midlothian, TX, USA
Post  Posted 20 Jul 2010 8:38 pm    
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Sounds to me like one of the potentiometer legs/terminals is shorting against the casting when its fully activated. You might just need to rotate the body of the pot a little bit.
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Lynn Oliver


From:
Redmond, Washington USA * R.I.P.
Post  Posted 20 Jul 2010 10:09 pm    
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Jim, that's a good thought, but when I look inside I can see that the pot only touches the rubber pad. Also it's one of the pots from Tom Bradshaw with the lugs on the end.

The problem was easily repeatable yesterday, but it hasn't failed yet since I adjusted the string. Hopefully I did something that fixed it, but I'd be happier if I knew exactly what it was.
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Tom Bradshaw

 

From:
Walnut Creek, California, USA
Post  Posted 1 Aug 2010 7:43 pm     Defective Pot
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Hey Lynn: Send me your current address and I'll send you a replacement pot. It is obvious that the pot you have is now defective. I suspect that you have excessive rotation available in your pedal. If that is correct, then you do need to re-set the stops inside the pedal to cut down on the length of the excursion (as suggest by other posters). It could be that with the excessive amount of rotation, you have damaged the permanent stops inside the pot itself. I warn against this in the installation instructions I send with each pot I supply. So, reducing the travel of the pedal's treadle should correct that problem.

In the meantime, I would like to replace the pot. Nothing ever made is always flawless. I don't know if there is really a flaw in the Dunlop pot in that pedal, but I do know that you should have it replaced. And, I'm ready to do that. Let me hear from you.
...Tom [tommybradshaw@gmail.com]
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Lynn Oliver


From:
Redmond, Washington USA * R.I.P.
Post  Posted 2 Aug 2010 7:47 am    
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Tom, thanks for your generous offer.

I think you are right, I must have damaged the stop. The full-on stop is set by the pot hitting a rubber pad, and since the replacement pot is smaller in diameter than the original it allows for more travel. From the difference in diameters it looks like I need to just about double the thickness of the rubber pad.
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