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Goran
Double Platinum Member
Sweden
2203 Posts |
 Posted - 02/05/2008 : 10:55:53
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I have just bought a TW-1 where one of the pots is non-functioning due to the fact that the shaft has loosened from the house of the pot, the pot now is in two pieces, the shaft and the rest.
Does anybody have experience from repairing pots from Boss pedals?
I have done it on pots from vintage guitars but any advises would be welcome.
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 02/05/2008 : 13:47:38
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quote:
Originally posted by Goran
I have just bought a TW-1 where one of the pots is non-functioning due to the fact that the shaft has loosened from the house of the pot, the pot now is in two pieces, the shaft and the rest.
Does anybody have experience from repairing pots from Boss pedals?
I have done it on pots from vintage guitars but any advises would be welcome.
Goran,
I guess would be better to introduce the real problem with a few pictures. Afterwards I could help.
Paralelly I hope that this pot type (value and characteristic) still available on the market.
But at worst case let me disassembly my TW-1 and send you the pot from it 
cheers |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 02/05/2008 : 14:00:01
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The Peak pot is a 100K, while the Sens pot is 50k.
Do you have any pedals that are sitting useless?
Pots get better with age in a guitar, not sure about in effect pedals tho.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/05/2008 : 14:22:15
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quote:
Originally posted by ChristoMephisto
The Peak pot is a 100K, while the Sens pot is 50k.
Do you have any pedals that are sitting useless?
Pots get better with age in a guitar, not sure about in effect pedals tho.
Hi Christo & Guys
That's an interesting observation, can you expand on you comment about the pots in a guitar.
Apologies if I have Hijacked the thread.
Regards Dr. Bob |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/05/2008 : 14:35:06
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quote:
Originally posted by ssanyee
quote:
Originally posted by Goran
I have just bought a TW-1 where one of the pots is non-functioning due to the fact that the shaft has loosened from the house of the pot, the pot now is in two pieces, the shaft and the rest.
Does anybody have experience from repairing pots from Boss pedals?
I have done it on pots from vintage guitars but any advises would be welcome.
Goran,
I guess would be better to introduce the real problem with a few pictures. Afterwards I could help.
Paralelly I hope that this pot type (value and characteristic) still available on the market.
But at worst case let me disassembly my TW-1 and send you the pot from it
cheers
Well� as usual I don�t have a decent digital camera�..
I know it�s a 50K pot and I also know I can order a new from Roland, or buy something that would fit much cheaper.
But I like to restore the one in there, this is a vintage pedal for sure.
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 02/05/2008 : 15:43:43
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quote:
Originally posted by Dr. Bob
quote:
Originally posted by ChristoMephisto
The Peak pot is a 100K, while the Sens pot is 50k.
Do you have any pedals that are sitting useless?
Pots get better with age in a guitar, not sure about in effect pedals tho.
Hi Christo & Guys
That's an interesting observation, can you expand on you comment about the pots in a guitar.
Apologies if I have Hijacked the thread.
Regards Dr. Bob
Theres some mystic that vintage/older pots, tone pots in particular improve with age, the resistance increases on them, improves the tone, so they say.
Partly due to the constant swiping along the pots inners, not from sitting in one position. Guess thats why some ppl repair the pots instead of replacing them.
This is my second hijacking of a tread today, the CE2 vibrato mod turned in to HF2 vibrato/speedy delay/ring mod/spaceship/wet-dry control mod |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/07/2008 : 11:19:47
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I picked the pot apart, no problem, and fixed the shaft to the viper. Tested it, it worked fine. Then I resoldered everything, changed the 4.7K resistor (from pot to ground) as it was demolated.
But� the TW-1 doesn�t work, there goes signal through it both when on and off.
I have looked closely, thre are no loose cables and, as far as I can see, no bad solderings, no gone electrolytics (as I can see).
When on it sounds about like a fixed position wah.
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 02/07/2008 : 12:26:19
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| Did your trim pot get moved during the operation? |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/07/2008 : 12:33:05
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quote:
Originally posted by ChristoMephisto
Did your trim pot get moved during the operation?
Nope, but it could have been moved by the previous owner. |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 02/07/2008 : 12:43:06
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The service manual is of no help
unless you got an oscilloscope kicking around
you could try testing it with a new 50k pot |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/07/2008 : 13:05:25
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Hi Goran & guys
Maybe the wiper isn't making contact with the carbon tract & outer two pins on the pot.
Can you measure it with a multimeter, from centre (wiper) to both outer sides, & measure the outer pins to see if you get 50K or whatever value the pot is.
Or as Christo wisely suggested, just check it with any known good 50K pot, to see if you can isolate the fault.
Regards Dr. Bob
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/07/2008 : 13:15:10
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| The pot is OK, I�ve tested it with a multi meter. Before and after installation. |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 02/07/2008 : 14:08:08
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I'm running outta ideas, how are the tracks around the bad resistor you replaced?
Replace the pot if you can, it maybe a collector's item, but what are the chances you're ever gonna sell it? Roland would replace the pot if you sent it to them, not fix the pot. |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/07/2008 : 14:57:02
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The resistor is the one which sits on one of the legs of the pot and connected to ground. The original resistor had one of the �legs� broken were the thick part of the resistor begins, so it was unsolderable.
I will try a new pot, but I�m 90% sure the original one works. The shaft has loosened from the wiper and I opened the pot, put the shaft in place and checked (bye eye) if everything was working OK, it was. The I reassembled the pot and measured the resistances (rotating the shaft of the pot) with a multimeter that it was working as supposed, and it was.
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Edited by - Goran on 02/07/2008 14:57:38 |
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jack
Platinum Member
USA
1418 Posts |
Posted - 02/20/2008 : 06:12:32
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| Have you checked the wiring with a multimeter? Maybe the wiring has an open or a short. |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/20/2008 : 07:05:15
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| The wiring is OK. |
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Topic |
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Repairing pots?
