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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
 Posted - 04/23/2008 : 18:17:04
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| Yeah, forgot to mention I don't have a diode tester, I just checked the resistance on the multimeter and got aprox. 0.7Ohms in either direction as i remember, there is a transistor tester on it, don't know if i can somehow use that to test diodes? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/23/2008 : 20:37:24
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Hi PacoPicoPiedra! 0.7 ohms sounds like a failed diode to me. Was it in the circuit when you measured it, or had you de-soldered it? If it was 0.7 ohms both directions when it was desoldered, it's toast. If you are reading 0.7 ohms in circuit, then there is a "short" somewhere in the circuitry (possiby a failed IC).
It is certainly possible to use a transistor tester to test a diode, but only if the tester measures each junction separately. If you put a good diode as the base-emitter legs (leave the collector open) and you meter will read it, it will show OK one way and open circuit the other.
Regards, and wishing you luck...
Laurie. |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/23/2008 : 21:04:48
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Thanks Laurie, it was de-soldered when I tested it so probably was a good idea to replace it, but having looked a bit more at my multimeter I've now found the diode tester anyway 
just me being retarded |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/24/2008 : 11:00:11
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quote:
Originally posted by PacoPicoPiedra
Thanks Laurie, it was de-soldered when I tested it so probably was a good idea to replace it, but having looked a bit more at my multimeter I've now found the diode tester anyway
just me being retarded
Hi PacoPicoPiedra
So what readings do you get in the diode test mode?
What happened to your pedal before it stopped working?
Good luck
Regards Dr. Bob |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/24/2008 : 17:35:18
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Hi Dr. Bob, just tested the stock protection diode and it looks fine, forward voltage drop reads 655 which i assume is mV although it doesn't say, the other direction just reads 1 which i think it should do. So guess i didn't need to replace it after all, I'll probably put it back in later. I think my previous post pretty much explained what happened to it: quote:
I opened it up to generally tidy up my wiring after installing a jack for an expression pedal (which was working great at the time) and in the process, most of the wires to the power jack got loose, so after staring at the schematic for a while I worked out where everything had to go and put it all back as it should've been and it was after this that I couldn't get any wet out.
I have checked and double checked my wiring against the schematic and I'm pretty sure everything's where its supposed to be, pin from the DC socket to the middle ring of the input, ring from the DC socket to 22. The + battery terminal goes to the switched contact on the DC socket and the - battery terminal to the middle ring of the input.
But, if there's anything else you want clarified I'm here |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/24/2008 : 17:51:05
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Hi PacoPicoPiedra! Can you post pics of the current state of the wiring? Might help us get jump-started on the fault-finding.
Regards,
laurie |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/24/2008 : 18:11:48
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I will do once I get some batteries in my camera
Sorry Laurie... |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/24/2008 : 18:23:52
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Hi Hi PacoPicoPiedra
There are 2 pics of the DD-3, that Bossarea posted in the Internal pics thread.
You might be able see-work something out from them.
Unfortunately, there are no DD-2 pics.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=1
I might have to let you sort it out with Laurie, Christo & the other guys.
It's getting far too late for me over here.
I beleive that Stinkfoot has internal pics of the DD-3 on his site.
Regards Dr. Bob |
Edited by - Dr. Bob on 04/24/2008 18:25:18 |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/26/2008 : 16:02:59
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Hi again people,
Still no pics I'm afraid but I think I may have sortof identified the problem with the regulator getting really hot, I'm getting continuity between the regulator's 5V out and ground which would with my limited knowledge explain why there's no output voltage from it and its getting hot, the only thing is I'm not sure about just replacing it as this is the second one the pedals had and the first one did the same thing so I think something else must be wrong. In other news I've put the stock protection diode back in and jumped some of the tracks with resistor legs which I noticed were fractured, pedal still does the same thing and I'm now using a power supply which reads 9.8V so I'm pretty certain its not over voltage, some sort of oscillation noise has now appeared as well, sortof low buzzing sound which raises in pitch for about 10-15 secs after the pedals plugged in until it stabilises, but this was with just an open jack plugged in the input so it might just be rf or something, it was much quieter than the buzz from the jack when you touch it.
Pics coming soon, hopefully before I kill it any more.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/26/2008 : 16:14:29
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quote:
Originally posted by PacoPicoPiedra
Hi again people,
Still no pics I'm afraid but I think I may have sortof identified the problem with the regulator getting really hot, I'm getting continuity between the regulator's 5V out and ground which would with my limited knowledge explain why there's no output voltage from it and its getting hot, the only thing is I'm not sure about just replacing it as this is the second one the pedals had and the first one did the same thing so I think something else must be wrong. In other news I've put the stock protection diode back in and jumped some of the tracks with resistor legs which I noticed were fractured, pedal still does the same thing and I'm now using a power supply which reads 9.8V so I'm pretty certain its not over voltage, some sort of oscillation noise has now appeared as well, sortof low buzzing sound which raises in pitch for about 10-15 secs after the pedals plugged in until it stabilises, but this was with just an open jack plugged in the input so it might just be rf or something, it was much quieter than the buzz from the jack when you touch it.
Pics coming soon, hopefully before I kill it any more.
It definitely sounds like there is a short somewhere in the ciircuitry - the 5V regulator will be going into "overcurrent shutdown" (just like it is designed to do). If you use a multi meter to measure from the +5V rail to ground, I'm pretty sure you get close to zero ohms?
Sooo... somewhere something has gone short circuit to ground. Every time this has happened to me after working on something, it's always been a sloder "dag" that has accidentally fallen on some tracks somewhere and shorted them out. I'd suggest a careful visual inspection to see if that has happened. Look at places like IC7 pin 12/13 and 14/15. Or across the legs of C49, C43 or C47. Also check that the pads of the 78L05 (out-ground) aren't shorted right at the regulator.
If it's not a solder dag, then it's probably a dead IC7, IC11, IC12, or IC13. But my money is in the solder dag short somewhere... |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/27/2008 : 15:01:43
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Hey guys, you'll be pleased to know-SUCCESS! 
I found the short on the board with the pots, my dodgy wiring of expression pedal wires to blame, so rewired it making sure nothing shorted again and the thing's back alive again I'd forgotton how good it sounded, big thanks to Laurie and Dr. Bob
Now to do that hold time mod, http://www.bossarea.com/forum/topic.asp?TOPIC_ID=2784
anyone tried it? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/27/2008 : 15:13:15
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quote:
Originally posted by PacoPicoPiedra
Hey guys, you'll be pleased to know-SUCCESS!
Very pleased to hear it is fixed!! I don't yet have a "DD" series pedal, just an RV-3 and a crappy Behringer DD100. The DD-7 will be my first Boss delay when it hits the stores |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/27/2008 : 16:27:05
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Hi PacoPicoPiedra
That's great news.
It seems that Laurie was at least on the right track with his theory on it being a solder dag or short.
Regards Dr. Bob |
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PacoPicoPiedra
Copper Member
United Kingdom
16 Posts |
Posted - 04/27/2008 : 17:23:33
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For anyone who's been interested in it, I've just done the hold time mod and it works fantastic, all sorts of unearthly stuttering and buzzing noises now available |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/27/2008 : 17:33:24
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quote:
Originally posted by PacoPicoPiedra
For anyone who's been interested in it, I've just done the hold time mod and it works fantastic, all sorts of unearthly stuttering and buzzing noises now available
Hi PacoPicoPiedra[
Did you take any pictures, you could upload, while you were doing the mod?
Regards Dr. Bob |
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DD-3 problems
