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lohworm
Copper Member
France
27 Posts |
 Posted - 12/18/2009 : 16:07:27
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Hello !
I recently bought a non-working DD-3 for spare parts, but before I disassemble it, I've given it a try.
First I tried it with a battery, and it worked ! Not only on the "hold" position (as it was supposed to work only) but on the delay position too !
"Great !" I thought (hey, it's a Japan Blue Label)
Then I tried it with a PSA power supply, and it worked too...for a few minutes, then... WTF ? Only the "Hold" does the job !?!?
On the other delay positions, the light does not even light up anymore when switched on.
A few minutes later, back to the battery, and the light comes again, but not for long...
Looks like the flip-flop has an intermittent failure (I should rather write an intermittent working)...
But : the PCB is very very crowded, and I don't have any schematics...
Any idea, someone ?
Thanks,
Laurent |
Edited by - lohworm on 12/18/2009 16:11:46 |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
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lohworm
Copper Member
France
27 Posts |
Posted - 12/20/2009 : 22:50:58
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thanks for the schematics...
so, DD-2=DD-3 first version (yes, that's it)
I don't even find where the problem may lie...
Considering it's a MIJ blue label, maybe I should make it repair by a qualified technician... |
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Dirk
Platinum Member
Netherlands
1309 Posts |
Posted - 12/22/2009 : 10:55:02
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A MIJ blue label is supposed to run from an ACA adaptor, have you tried that?
For you see, the ACA is 12 volts whereas the PSA is 9 volts, lots of Digital pedals react strangly to the wrong voltage. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/23/2009 : 08:12:25
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G'day! Sorry Dirk - need to jump in here  All DD-2 and DD-3 pedals MUST run from a Boss PSA power supply or other regulated 9VDC supply. Using an ACA will cause it to be erratic or just not work at all. Worst case using a non-regulated supply can damage the beast.
I'd be happy to help but am on vacation, so if you can wait until the New Year I'll be back in the lab and able to walk through the issue with you.
Laurie. |
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Dirk
Platinum Member
Netherlands
1309 Posts |
Posted - 12/23/2009 : 10:44:09
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So my answer was pretty close 
I wasn't aware that Boss already used a PSA just for the DD-2 models back in the early 80's.
But you would be able to feed it from an ACA adaptor as long as you daisy chain it with another pedal, right?
Isn't that what Stinkfoot always tells us? |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 12/23/2009 : 10:54:11
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| Think its the other way 'round, you can run ACA pedals with a PSA p/s and daisychain, as long as one is a PSA |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/23/2009 : 11:44:07
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| Nooo.... DD-2 and DD-3 MUST have a PSA. |
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lohworm
Copper Member
France
27 Posts |
Posted - 12/23/2009 : 17:44:39
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Hi,
I do have a ACA and a PSA, but because the label says "use with PSA", I only tried with PSA (and I did right, obviously)
The problem occurs both with battery and power supply, and the fact that sometimes it works and then a few minutes later don't, makes me think to a mechanical problem (some kind of bad solder joint, but I don't need to really move the pedal for the problem to appear) or a component starting to fail when heating (as far as we can call 'heat' what happens inside the components when such a pedal works)
>Laurie : no problem, I can wait as the pedal was initially bought for spare parts...If it can come back to life a day or another, it just would be an extra-bonus !
Merry Christmas everybody !
Laurent
(is my english enough understandable ?) |
Edited by - lohworm on 12/23/2009 17:45:05 |
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FRANZONI
Double Platinum Member
Ireland
3543 Posts |
Posted - 12/23/2009 : 21:22:54
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Your english is fine... Welcome to the forum... good luck with the DD-3.... |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 01/10/2010 : 02:59:58
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quote:
Originally posted by lohworm
Hello !
I recently bought a non-working DD-3 for spare parts, but before I disassemble it, I've given it a try.
First I tried it with a battery, and it worked ! Not only on the "hold" position (as it was supposed to work only) but on the delay position too !
"Great !" I thought (hey, it's a Japan Blue Label)
Then I tried it with a PSA power supply, and it worked too...for a few minutes, then... WTF ? Only the "Hold" does the job !?!?
On the other delay positions, the light does not even light up anymore when switched on.
A few minutes later, back to the battery, and the light comes again, but not for long...
Looks like the flip-flop has an intermittent failure (I should rather write an intermittent working)...
But : the PCB is very very crowded, and I don't have any schematics...
Any idea, someone ?
Thanks,
Laurent
If the LED lights up ONLY in the "hold" position, there is fault somewhere in the circuit around the flip-flop and mode switch. I've seen broken mode switches, and heard a report of a dead flip-flop (but never seen one on my bench). However... the most likely candidate is a broken/almost broken connection somewhere.
To start, please check that the wire joining point #3 on the main board to the switch board is OK, and that the wire joining the boards at point #1 is also OK. Give these wires a good wriggle and use a meter to test continuity if you have one. |
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starr36
Platinum Member
Canada
1172 Posts |
Posted - 01/10/2010 : 09:43:33
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quote:
Originally posted by Laurie
quote:
Originally posted by lohworm
Hello !
I recently bought ...
Thanks,
Laurent
If the LED lights up ONLY in the "hold" position, there is fault somewhere in the circuit around the flip-flop and mode switch. I've seen broken mode switches, and heard a report of a dead flip-flop (but never seen one on my bench). However... the most likely candidate is a broken/almost broken connection somewhere.
To start, please check that the wire joining point #3 on the main board to the switch board is OK, and that the wire joining the boards at point #1 is also OK. Give these wires a good wriggle and use a meter to test continuity if you have one.
- er sounds familiar eh, Laurie - brokent/shorting mode switch  |
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lohworm
Copper Member
France
27 Posts |
Posted - 01/11/2010 : 23:27:26
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Hello !
Thanks for the informations and for the first step of the investigation.
I will give it a look and keep you informed.
Laurent. |
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Topic |
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DD-3 non working (oh no, not again ;-)...but...
