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prosp
Copper Member
Japan
7 Posts |
 Posted - 08/11/2008 : 09:34:15
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Hi all !
Does anyone have pictures of the DD-20's insides ?
I got a DD-20 two days ago, everything works fine ... except it doesn't do any delay
Not wanting to think about fried chips or anything of the kind, I took a look inside.
The first thing I noticed when opening it up, was a relatively big white blob near the center of the PCB.
It looks different from the glue I've seen in other Boss pedals, and I'm not sure what in a DD-20 would require to be under a huge patch of glue so generously dealt that it flowed and dripped over nearby components ... ?!
As it's right next to a capacitor, I thought that there might have been a leak, but somehow that doesn't look too right either ...
Anyway ! Any photo of the DD-20 board will do.
Thanks in advance !  |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 08/11/2008 : 11:26:41
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Hi prosp
Welcome to the forum from Australia.
IF the DD-20 is only 2 days old it should still be covered under warranty.
& it you got it Secondhand, it might still be under the original 12 month warranty.
Do you know what might have happened to it?
And did you purchase it, knowing that it was faulty?
I have some DD-20 pics of a really busted up one, somewhere in my archives, the PCB, is cracked in a few (4) places, someone tripped onto it.
Regards Dr. Bob |
Edited by - Dr. Bob on 08/11/2008 11:27:33 |
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prosp
Copper Member
Japan
7 Posts |
Posted - 08/11/2008 : 20:34:55
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quote:
Originally posted by Dr. Bob
Hi prosp
Welcome to the forum from Australia.
Thanks a lot ! 
And cheers to you for everything you do !
quote:
IF the DD-20 is only 2 days old it should still be covered under warranty.
& it you got it Secondhand, it might still be under the original 12 month warranty.
And did you purchase it, knowing that it was faulty?
Alas it's not under warranty any more ... and oh yes, I did buy it knowing that there would be trouble I did not know exactly what kind, though : I found it in a small shop, the guy had a collection of ... well ... anything. Basically junk. The DD-20 was the only thing related to music. No guarantees, no information, no nothing ... but really cheap ! (we're talking suspiciously cheap)
- Does it work ? I asked
- No idea. Do as if it didn't, he replied !
I just turned it on (still had batteries inside) and checked the knobs and pedals : like I said everything seemed to work fine, lights of various colors popping up everywhere 
... it just doesn't do delay as I noticed when I got back home and tried it.
quote:
Do you know what might have happened to it?
No idea ... I have no background information. If the shopkeeper knew anything, he did not tell me.
quote:
I have some DD-20 pics of a really busted up one, somewhere in my archives, the PCB, is cracked in a few (4) places, someone tripped onto it.
Oh boy. Tripped on the PCB you mean ?
Well actually that might do the trick : even on a broken one, it should be easy to see if there's a white blob somewhere near the center ... Would you send me this picture if you have the time ?
Any other ideas as to why the delay is not functioning ? Beside a fried chi ... nono I said I was not going to think about that 
Thanks !
Prosp |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 08/11/2008 : 21:07:59
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Dr. Bob, does a DD-20 have a flip-flop like the compact series? Busted flipflop would cause these symptoms..
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red_riviera
Bronze Member
United Kingdom
111 Posts |
Posted - 08/11/2008 : 22:27:03
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| Have you checked which mode it is in? The DD-20 can run the direct signal through one channel and the delay through the other, if you're trying it in mono in that mode that might be why you're not getting any delay. |
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prosp
Copper Member
Japan
7 Posts |
Posted - 08/12/2008 : 09:52:37
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Hi again and thanks for your input !
Red_riviera : yes I have tried different output modes. For instance, if I choose output 2, which would be direct signal to OUT A and delayed signal to OUT B ... with mono input in IN A ... I do get the direct signal from OUT A and nothing from OUT B.
Similarly, when in output mode 1, mono IN A, mono OUT A gives me direct signal and nothing else.
Laurie : busted flip-flop ... that's an idea ... any more info on that ?
Ah wait. I decided to try one more time before I sent this message. Still negative results, BUT ... I accidentally hit the power cord, pulling it from the DD-20. My equalizer that was next to it, on a daisy chain, was turned off ... ??
I tried putting an old drum machine on the same daisy chain : when I fiddle with the power cord behind the DD-20, it sometimes goes on and off (the connector is obviously weak, to say the least), and at the same time the drum machine turns itself on and off 
Well !! Does that ring a bell ? Ground problems or something ?! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 08/12/2008 : 10:19:57
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Hi prosp
Are you using the correct REGULATED plug pack for the DD-20?
or one with the correct voltage & current ratings.
Remember the DD-20 used more current than a standard pedal
And how many other pedals are you trying to run off the plug pack?
Try it on it's own, most of the new digital & dual pedals seem to prefer a seperate plug pack adapter.
The other thing you might want to check, is the solder joints on the DC input socket & see if they are cracked or need re-soldering.
Send pics of it if you need to.
I will search for the ones I have of the DD-20 with the cracked PCB.
Regards Dr. Bob.
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Edited by - Dr. Bob on 08/12/2008 10:20:46 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 08/12/2008 : 14:09:27
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Hi prosp & Guys
Here is a link to the an internal picture of a DD-20.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=2489&
It's over in the Photo Essays section of the TonePad site.
Many Thanks to to www.tonepad.com/
I posted this link back in Feb 2007, so it took me a while to figure
out where it was?
Thank God for the old search Bossarea.
The newer search hasn't indexed back this far.
There does seem to be some while silicone type glue, just to the left of centre,
prosp, is this the glue you were referring to?
The pics I had of a cracked dual pedal, turned out to be the RC-20, that
was what confused me for a while, this has taken up about 2 hours or search time, because of the mix up.
Anyway, I hope this helps.
Regards Dr. Bob
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Edited by - Dr. Bob on 08/12/2008 14:36:50 |
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prosp
Copper Member
Japan
7 Posts |
Posted - 08/13/2008 : 09:15:54
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Hello again Dr Bob (and all )
Great, thank you so much for the picture !! This was indeed the glue I was referring to ! What threw me off is that in my DD-20 it looks different from the glue I've seen in other pedals (and from the one in your picture, for that matter), more like ... the white cement you put around bathroom sinks and bathtubs ? (I don't know the word, sorry)
But it's the exact same place, between the round component with 681 written on top and the capacitor next to it ...
What is it protecting, I wonder ...
Anyway, so now we have this out of the way !
So far I've tried powering the DD-20 with a Boss PSA adaptor (regulated, up to 200mA), a Onespot daisy chain (1,7A) and a third adaptor (can't remember the brand now, but goes up to 1,2A). All are 9V, center-negative.
As for the Onespot, my first tries were with the DD-20 alone. Once I tried with my GE-601 equalizer plugged on the daisy chain ; after the forementioned funny results, I unplugged the equalizer (I really like that old thing  ) and replaced it with a DR-550 drum machine, which I also used to feed the DD-20.
I may have overlooked something, but I guess power sources or current consumptions are not the source of the problem.
I checked the solder joints around the DC plug ... everything looks clean and solid too.
Hmm. Does anyone has any more ideas of "simple" problems to check for ? I feel I'm running out of them, and that leaves us with only serious trouble ... 
Anyway, thanks again DrBob, for all the time you spent fishing for that photo !! I hope it helps others as well
Cheers ! |
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the-destructor
Silver Member
USA
334 Posts |
Posted - 08/13/2008 : 19:48:13
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"white cement around sinks & bathtubs" = grout, possibly caulk (pronounced COCK). I've found a "good handyman" can never have enough caulk on hand... or is that in hand? HMMM.
Sorry, but I have no way to help in this instance other than poor comic relief.
Welcome to the group prosp.
 T-D |
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prosp
Copper Member
Japan
7 Posts |
Posted - 08/14/2008 : 16:20:10
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Thanks The-Destructor, I got my hands full right now !
Anyway ... I am not getting anywhere, but a few more tries yielded some new facts and information. Not overly useful for my problem, but who knows it might be interesting to somebody, so here goes :
- the Twist mode works, as far as I can tell ! For those who don't know, the twist mode, while you press the pedal down, delays the input signal and does that "turning the delay time knob" effect, ie raising the pitch, and then bringing it back to normal. Well it works ! ... my guess, for what it's worth, is that the Twist effect is not made by the same part of the machine as the normal delay.
- I am actually getting something in Dual and Pan modes : the original signal, followed by one repeat, after about 100ms. The Level and Delay time knobs have no effect on this, it's always the same.
The Dual mode adds a short delay to the main one, so that's consistent, it could be what I hear. Again it suggests that this sub-delay is not produced in the same place as the main one.
The Pan mode is basically a ping-pong delay. What that single repeat is doing here, beats me.
- I also have something in Smooth mode : faint, un-delay-ed, chorus-ed original signal is there. Pretty much unrelated to my problem, but it does tell us part of how the Smooth mode operates.
So : my guess is that the main delay part of the pedal took a walk and is simply unoperative, period (well we knew that from the beginning, but ... )
But : I cannot really believe that the delay chip stopped working, just like that. Even if the pedal got too many volts or reverse polarity or whatever, wouldn't it be strange that only the actual delay part blows, and all the rest continues to work normally ?
Any help/ideas/thoughts/jokes still more than welcome !
Cheers |
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DD-20 insides info
