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tdkrause
Copper Member
USA
4 Posts |
 Posted - 11/09/2008 : 06:42:01
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| A friend of mine just gave me a DD-2 that is not working. He said it worked fine and just quit one day. I checked a couple of things and found that the battery gets pretty warm when a cord is plugged into the input. Nothing else happens. No sound and the led does not light up. I'm not sure what to check next but it seems there may be a short somewhere. Any ideas? |
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tdkrause
Copper Member
USA
4 Posts |
Posted - 11/09/2008 : 06:59:02
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| BTW, I doubt it will be helpful, but I checked the led by connecting it directly to a battery and it still works. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/09/2008 : 07:43:43
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Welcome tdkrause!
What often happens is someone puts the wrong adapter on the pedal. When this happens, it is fairly common for the protection diode to go short circuit. This makes the battery get hot...
Almost certainly, D6 is short circuit. Unsolder it and VERY CAREFULLY connect a known good battery - be super careful to not touch the battery terminals around the wrong way, even for an instant. If the battery doesnt get hot with D6 removed and the pedal works, you have been lucky. Go buy a 12V 1W zener diode and replace D6. If the pedal doesnt work, let us know and we'll see what else it might be...
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 11/09/2008 : 13:14:07
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Hi tdkrause
Welcome to the forum from Australia.
I see you are already in the good hands & advise of Laurie.
D6 is a very common fault on the DD-2, Good luck.
Technically D6 is an 11VDC 1 Watt zener diode.
But these can be very difficult to locate-source, the 12VDC zener,
is a perfect replacement, & it's much easier to find.
If you can, ask your friend what might of happened, before it stopped working correctly.
Regards Dr. Bob |
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tony
Bronze Member
United Kingdom
142 Posts |
Posted - 11/09/2008 : 15:12:23
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Inside the DD 2, there's a coated foil shield grounded to the output jack that's there for noise protection. While the surface of the shield is insulated, it's edges are not.
What sometimes happens is that the edge comes into contact with the DC board and shorts it out, causing the exact symptoms you describe, particularly the warm battery. An option among many....
If it quit suddenly it also might be that the previous owner gave it too many volts, causing the D6 problem already described by Laurie.
From my own experiences and what I've read on forums, the causes of most DD2 problems are actually quite minor when you get down to them.
p.s. - BOSS DD 2 - contender for glitchiest vintage pedal ever??!!
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tdkrause
Copper Member
USA
4 Posts |
Posted - 11/09/2008 : 16:34:45
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| There is, in fact, what appears to be a slight char at the base of D6. I doubt any place like radio shack will have such a diode. Any suitable replacements or am I better off ordering online? |
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tdkrause
Copper Member
USA
4 Posts |
Posted - 11/09/2008 : 17:11:12
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| I removed D6 and it works fine! Thank you very much for your help. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/09/2008 : 17:38:03
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You are welcome!
PLEASE... replace D6 ASAP. If D6 is not present and a reverse voltage is applied to the pedal or a voltage that is too high is applied, it will fry some/all of the chips in the pedal and the entire pedal will probably be a throw-away.
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 11/09/2008 : 20:04:44
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..then think of the lovely DD-2 chassis that will be available!
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zerksies
Double Platinum Member
USA
3406 Posts |
Posted - 11/09/2008 : 23:28:19
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| true that |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 11/10/2008 : 08:10:18
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quote:
Originally posted by Laurie
You are welcome!
PLEASE... replace D6 ASAP. If D6 is not present and a reverse voltage is applied to the pedal or a voltage that is too high is applied, it will fry some/all of the chips in the pedal and the entire pedal will probably be a throw-away.
Hi tdkrause
Please heed Laurie's warning.
I won't repeat it.
It's just, that we don't want you to ask us about repairing a REALLY FRIED Vintage & collectible DD-2.
Regards Dr. Bob
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lesdudis
Copper Member
14 Posts |
Posted - 01/10/2009 : 04:59:32
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hey everyone, I got a DD-2 in the mail today and right from the beginning it seems to be having problems similar to what tdkrause had back in November.
a couple 9V adapters I've tried have either not worked or the light is too dim and causes noise. when I try a 9V battery, the light is dim and sound works but then the battery gets hot. I have Boss adapters but haven't tried them yet because I don't have them on me right now. do you think this is the same problem? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 01/10/2009 : 05:07:45
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| Could be. Check D6 first thing. |
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lesdudis
Copper Member
14 Posts |
Posted - 01/10/2009 : 05:12:51
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quote:
Originally posted by Laurie
Could be. Check D6 first thing.
I'm not sure what D6 means? is that a component inside the pedal? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
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Topic |
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DD-2 died
