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boss freak
Gold Member
USA
663 Posts |
 Posted - 12/30/2005 : 14:56:00
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Here's something that I hope you guys may have a good answer for.
The split shaft on one of the pots on my TR2 has been pinched closed and therefore, the knob has a tendency to fall off or spin around freely on the shaft. I have temporarily fixed the knob in place with some gaffer's tape wrapped around the shaft, but I would like to know whether or not it's safe to attempt to separate the halves of the shaft again, and if so, how I should go about it to prevent breaking the shaft entirely.
Thanks. |
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phostenix
Gold Member
USA
754 Posts |
Posted - 12/30/2005 : 18:29:33
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I usually just use some small flat blade screwdrivers to open them up. I've got a Rockson chorus that has this issue, so I'll take some pix tonight and post them.
Grace and peace,
Steve
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boss freak
Gold Member
USA
663 Posts |
Posted - 12/30/2005 : 21:18:36
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| That would be great. Thank you. |
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phostenix
Gold Member
USA
754 Posts |
Posted - 12/31/2005 : 03:07:53
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OK, so I've got this Rockson Chorus that I've mentioned in a thread before as a sorry excuse for a Boss clone that even manages to fail to properly copy Boss' case. The knobs that they use are too small for the pot shafts, so it's a REAL battle to remove them, and when you do, the pots look like this:
So, I want to replace their ugly knobs with some fine looking Boss knobs.  I've got a couple of the all plastic knobs from Boss (no set screw) for the splined shaft pots like these.
The first thing you need to do is get 2 small screwdrivers. The ones I'm using are the silver handled ones that come in a set up 5 or so, usually. They need to be small enough to get into a small gap.
A flat blade screwdriver has a taper to the tip, so you can use it as a wedge to open up the pinched gap:
After you open up the gap a little, leave that screwdriver in place and take another one, and force it into the newly created gap in the top of the pot:
Now the gap looks like it should:
You need to be very careful and slowly press the screwdrivers into the gaps so that you don't spread the pot too far open and break one of the sides. That is also why you need small screwdrivers.
If the pot metal is soft and the gap closes back up when you press a knob back down on it, you may have to make some sort of a shim to put in the gap to keep it open. Find a strip of plastic or solid cardboard that is the right thickness to fill the gap without stretching it open, cut it to size and stick it in the gap.
Now, the Rockson Chorus is looking better already:
Hey, where did that LED come from? 
And, yes, that power jack is crooked. The PCB is so thin that it has warped into a U shape so the power jack comes out the side crooked like that. I told you, this thing's a piece a work....
If you get the right tools and are careful about it, it's a pretty easy repair.
Grace and peace,
Steve
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Edited by - phostenix on 12/31/2005 03:20:45 |
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boss freak
Gold Member
USA
663 Posts |
Posted - 12/31/2005 : 19:05:22
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Great photo tutorial phostenix! Thanks very much for that. I'll give it a try. |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 01/03/2006 : 10:51:53
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When fixing with a screwdriver be really careful, I messed up a few myself�.. Very easy to break them. IF you break them you can make a shim of plastic, wood or anything of the same width & length, put all back in place, then use superglue to fasten it.
BE CAREFUL so you don�t get any superglue along the shaft of the pot, running down into the pot�.. THAT I haven�t done yet, but it�s only a question of time I guess�.
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boss freak
Gold Member
USA
663 Posts |
Posted - 01/07/2006 : 01:22:25
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I hope this project won't end up like the infamous "trimpot episode" with my PH2!  |
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phostenix
Gold Member
USA
754 Posts |
Posted - 01/07/2006 : 01:36:21
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What ever happened to that pedal?
Grace and peace,
Steve
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boss freak
Gold Member
USA
663 Posts |
Posted - 01/07/2006 : 03:34:48
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It's sitting right in front of me at my desk where I have my computer (eBay & bossarea ) and where I perform microsurgery on pedals. That way it constantly reminds me not to go too far with tweaking other pedals!   |
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Topic |
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Repairing potentiometers
