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Ward
Copper Member
Australia
28 Posts |
 Posted - 06/04/2009 : 09:54:27
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| Hi,I just bought a DD-3 off the bay and it's not right, the dry signal does not sound when the pedal is engaged. Everything else is AOK. It's the DD3A model with the big square chip. Can someone point me in the right direction please. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/04/2009 : 10:50:04
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Hi Ward
Welcome to the forum.
Nice to see so many Aussies joining up.
-Did you buy it knowing it was faulty?
If not, you can make a claim against the seller for selling faulty goods.
-Do you know anything about why it might have failed?
-Have you looked inside it yet?
-Do you have soldering skills & the tools to repair it?
-Can you please upload some pics of both sides of the PCB?
-Most times, It can help us to help you.
Regards Dr. Bob  |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/04/2009 : 11:46:01
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Hi Dr Bob, thanks for the welcome. The bloke who sold me the pedal said it was working when he sold it although he said that he didn't really know how to use it? That's a worry. I tried to phone him up but when his details were sent to me by ebay, the ph# was a message bank so I emailed him to ask for his number so I could speak to him but got no reply. I then started a paypal despute in which he said I must have busted it when I opened it up. I had told him that I had opened it up and that there were no wires come away and that although I'm pretty handy, I don't know the first thing about fixing this thing. So the despute is on going, I bought the pedal assuming it worked properly. The sellers description of the item was simply to state that it is a Boss DD-3. So I got suckered. The paypal despute was supposed to be resolved by the 21st of May but I haven't heard anything from them. If I can fix it myself I will just end the despute.
I'll have to take pics and post them tomorrow. While I can make tube amps, I'm not a tech, I've just built a few amps, I have no CRO nor would I know how to use one, only a DMM, I have done a lot of pedal mods and I am good with an iron.
The pedal has had mods done to it, there are a few non Boss caps in there and the board has a lot of new solder joints, I have cleaned up a lot of the flux that was all over the place and reflowed a lot of the board. I'll post pics tomorrow. Thanks Bob. |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/04/2009 : 12:35:35
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Here are some pics of the board. I'm not sure if the component side pics are any good, there's just so many wires in the way, oh well, see how you go. Let me know if you want me to try and get those wires outta the way n take more pics. Thanks, Nic.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/05/2009 : 09:43:54
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Like I mentioned in the other thread, you will need to trace the signal through the pedal.
When I was fixing my DD-3 that had the same symptoms, I started at the output jack and traced back visually until I found the output opamp. I tested for signal along the trace with the scope until I got to the opamp (IC1 on the V3 DD-3). There was no signal all the way along the trace. But there was signal on the input of the opamp. Changed the opamp and all was well.
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Edited by - Laurie on 06/05/2009 09:45:40 |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/06/2009 : 03:34:49
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Thanks Laurie, if I can find a replacement I'll just swap out IC1 n see what happens.
Edit: I just had a look and have no idea where to find a replacement, I wouldn't know what to ask for, is there a sub chip, what is it, where is it. |
Edited by - Ward on 06/06/2009 03:48:38 |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/06/2009 : 07:19:31
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quote:
Originally posted by Laurie
Like I mentioned in the other thread, you will need to trace the signal through the pedal.
When I was fixing my DD-3 that had the same symptoms,
I've had a look around here and I can't find one thread pertaining to my problem. Perhaps I should restate the problem.
The unit has NO dry signal coming out of the mono output, everything else is good. The delay works fine I just have no original guitar signal coming out of the mono jack. If I was using this thing in stereo it would be fine as I am getting the original signal from the direct out jack but as a mono thing I get no original signal. This does not sound like the usual "no delay" problems that I have found elsewhere.
Dr Bob, I have posted pics but now you have forsaken me? Are you ill? Is there anyone here who is familiar with this particular fault. |
Edited by - Ward on 06/06/2009 07:22:58 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/06/2009 : 07:38:01
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Ohhhh......... I misunderstood.
How this can happen is if the "direct" jack or wiring has a fault.
The direct jack is wired up so that if a plug is inserted, the plug closes a circuit that reroutes things so that the dry signal comes out of the direct output, and ONLY echos out of the mono output. It sounds like there is a short somewhere that is closing that circuit.
Check the "direct" jack. There should be 3 terminals - two signal wires and ground (the ground might just be the chassis in the V2). One of the signal wires will go to the "tip" connector of the jack - ignore this one. One of the wires will go to the "ring" of the jack - check that this one is not shorted to ground somehow. Let us know what you find. If it isn't a short on the direct jack, it will be a fault in the switching circuitry somewhere.
If you look at the schematic for the DD-2 the connection I'm talking about is #18. |
Edited by - Laurie on 06/06/2009 07:39:11 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/06/2009 : 09:42:51
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Hi Ward
quote:
Dr Bob, I have posted pics but now you have forsaken me? Are you ill? Is there anyone here who is familiar with this particular fault.
To be really honest - Yes I have been ill, & took some time to myself.
Not to mention that we also have day jobs, & families to look after.
And sometimes, we just need time to consider the fault/s & issues.
I saw that Laurie has replied to your post, & has outlined a few things to consider & look at.
You did mention:
quote:
The pedal has had mods done to it, there are a few non Boss caps in there and the board has a lot of new solder joints
You will have to take this into consideration when looking to repair it.
as well as any other problems that the mods may have introduced into the equation.
Laurie & I have changed a few in-out 6.5mm sockets in out time.
They typically suffer from stress cracks, from people standing-jumping on the leads.
Insert a plug & move it around gently, to see if any hairline cracks appear in the plastic.
As far as I'm aware, there is no official, or otherwise schematic & service notes for the later SMD square chip DD-3's.
There are some pics of Laurie's DD-3 with the chip on the component side, in the internals thread, if that helps you any.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=12
I thinks your best course of action is to sort out if the socket is wired & functioning correctly.
AS Laurie wrote, remember that the chassis provides the GND connection for these sockets.
if you are working on it without the case - just use a croc-clip lead to connect the GND's.
On a seperate issue.
Please be aware that I have forwarded the PM you sent me today, to Bossarea-Admin.
He will reply to your question & explain the situation with Subscribing & Unsubscribing to the forum.
Regards Dr. Bob
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Edited by - Dr. Bob on 06/06/2009 09:49:09 |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/06/2009 : 10:54:57
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quote:
To be really honest - Yes I have been ill, & took some time to myself.
Not to mention that we also have day jobs, & families to look after.
All good Bob ol buddy, hope y're feeling better, was only being light hearted about you forsaking me, the printed word gets me into trouble all the time.
Laurie, you da man bro, it was the blue wire that should have gone to the direct out ring, it went to ground, I guess I should have known that all ground wires being black should have told me the blue shouldn't have been there.
As I said, this thing has had some work done on it and a lot of the connections to the jacks were non original, pretty bodgy looking stuff, so I re terminated a lot of them as well as the other ends going to the board, a lot of them were hanging by a thread. So now it works perfectly, not sure how it sounds compared to a stock one. I can't thank you enough.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/06/2009 : 13:54:12
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Hi Ward
That's really good news.
BTW - can I ask what you paid for it?
We should probably keep some kind of un/official "Pedals that were saved list".
It would be interesting to read in the future, perhaps a cross reference to the thread/topic number as well.
I have been thinking about this one for a while now.
Unless Laurie has been keeping some XLS list on his local workstation?
Just going by memory, the list would mostly consist of DD-2's & DD-3's
with just a sprinkling of the other pedals.
Regards Dr. Bob
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/06/2009 : 16:07:48
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quote:
Originally posted by Ward
I can't thank you enough.
No worries mate! I'm particularly pleased another good pedal has been rescued. For some reason, fixing these DD-2/3 pedals has become sort of a specialty of mine.
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Mesjoggah
Gold Member
Netherlands
595 Posts |
Posted - 06/06/2009 : 16:16:43
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quote:
Originally posted by Laurie
quote:
Originally posted by Ward
I can't thank you enough.
No worries mate! I'm particularly pleased another good pedal has been rescued. For some reason, fixing these DD-2/3 pedals has become sort of a specialty of mine.
Well in that case: I've found one in the mail today- not working and being worked on, i'll post pictures ASAP. i saw D6 was not on the board, do i need to bypass that or should it work without? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/06/2009 : 16:43:27
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quote:
Originally posted by Mesjoggah
i saw D6 was not on the board, do i need to bypass that or should it work without?
It will work without it, but be SUPER careful that reverse polarity isn't applied (e.g. from briefly touching the battery the wrong way around). |
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Ward
Copper Member
Australia
28 Posts |
Posted - 06/07/2009 : 01:29:45
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quote:
Originally posted by Dr. Bob
BTW - can I ask what you paid for it?
We should probably keep some kind of un/official "Pedals that were saved list".
$113 plus $10 postage,AUD of course, that's not cheap, the pedal is pretty knocked about and I did buy it as a working pedal. I'm very happy now that it's up n running properly. Thanks again for the help. |
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Topic |
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DD3 no dry signal.
