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Patrick
Copper Member
United Kingdom
22 Posts |
 Posted - 03/01/2010 : 20:22:29
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Hi,
I have a DM-2 but it has a problem.
It whistles a lot when I change the Repeat Rate and the repeat rate effects don't seem to work properly. Any Suggestions?
Regards Patrick |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/01/2010 : 20:44:18
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hi patrick! Did it just start, or did it come like this? If it just started, what hapened to it just before the change?
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Patrick
Copper Member
United Kingdom
22 Posts |
Posted - 03/01/2010 : 23:25:25
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Hi, laurie.
It came like this so I have no idea what could have caused it.
Regards Patrick |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/01/2010 : 23:40:50
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| Check the wiring - the DM-2 has a "single ended" shield arrangement to one of the pots (rate as I recall). If someone has fiddled with that (like hooking up both ends of the shield), it might cause the symptoms you are hearing. |
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Patrick
Copper Member
United Kingdom
22 Posts |
Posted - 03/01/2010 : 23:58:11
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Hi, I'm not familiar with what a single ended shield is.
But the repeat rate pot is connected to the board by 3 wires (13,15,16) and only 2 wires connect to the pot therefore 13 runs into either 15 or 16 or both.
Does that sound right to you?
Thanks for taking the time to help
Regards Patrick |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/02/2010 : 01:16:48
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Yeah that's it. #13 doesn't connect to anything at the pot end (hence "single ended" shield).
What are you powering it with? Don't forget this is an ACA pedal and a PSA supply won't give it enough volts if it is the only pedal in the chain. Have you tried a fresh battery?
If that all looks OK, then maybe someone has been playing with the trim pots. Ummm... I'm guessing you don't have a scope and signal generator handy?
Do the trim pots look like they've been adjusted?
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Patrick
Copper Member
United Kingdom
22 Posts |
Posted - 03/02/2010 : 12:40:02
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Hi, yes I know it's a ACA pedal so I'm powering it with a unregulated 12v (300mA) which if I'm correct is a good alternative to the ACA.
The trim pots all look the same so I assume they are original parts. How could these have been tampered with?
I am without a scope and signal generator so is there another wayI can tell if they have been changed?
Regards Patrick |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 03/02/2010 : 14:07:01
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The trim pots usually have a spot of wax on them - if they have been adjusted, sometimes that looks like it has been broken.
Have you tried it with a fresh battery?
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Patrick
Copper Member
United Kingdom
22 Posts |
Posted - 03/02/2010 : 15:54:15
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Hi, the wax it still there and it doesn't look like it's been tampered with in any way. The same thing happens with a battery too.
Regards Patrick |
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Topic |
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DM-2 high pitched feedback
