| Author |
 Topic  |
|
angusang
Copper Member
Zimbabwe
4 Posts |
 Posted - 05/25/2009 : 11:29:41
|
The pedal powers up with battery or AC.
LED engages and dis-engages as it's suppose to.
The problem is that I only get clean bypassed sound whether the pedal is engaged or not.
Took the pedal apart but could not find any broken leads, etc.
Could it be a screwed-up level pot or something else?
I'm handy with an iron and a multi-meter but need help (if it's possible) on where to start looking.
Thanks y'all.
:) |
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/25/2009 : 14:44:35
|
G'day angusang and welcome!
Couple of questions, the dumbest one first.
1) Is the "E.level" knob all the way counter-clockwise?
2) Was it working and then failed? If so what happened to make it stop working?
3) Are you using a Boss PSA adapter - VERY important... the DD-3 won't work on no-name 9V adapters. I note though it won't work on battery, so it probably isn't this.
|
Edited by - Laurie on 05/25/2009 14:50:13 |
 |
|
|
Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/25/2009 : 15:29:59
|
Hi angusang
Welcome to the forum from Australia.
Which DD-3 do you have?
The long chip, or the newer SMD square chip one?
Regards Dr. Bob. |
|
|
|
angusang
Copper Member
Zimbabwe
4 Posts |
Posted - 05/25/2009 : 15:52:03
|
Hiya Laurie
Thank you for the quick reply.
Let's sort out the dumb questions straight-away :
1) All pots have no visible effect on the output whether clockwise or counter-clockwise - all I hear is the dry signal, no wet signal.
2) The pedal was given to me by a non-musician in its current condition; no history.
3) I'm using a PSA/battery - the pedal powers up with either option and the LED turns On and Off when the f/switch is pressed.
This same non-musician friend of mine also handed me a "faulty" DD-5 which I am also keen to fix and which I will post in a separate thread.
I have revived a couple of dead pedals in the past caused by broken wires/connections, faulty pots/switches, etc but I would say those were pretty simple fixes.
I was electrically trained so electronics aren't really my forte although I do understand some basic electronics.
I hope you'll be patient with me if I seem spaced-out by any electronic concepts involved - but from other threads I've seen, I know you're a good bloke!
Please bear with me, i'll try to keep up with you!
Cheers! |
|
|
|
angusang
Copper Member
Zimbabwe
4 Posts |
Posted - 05/25/2009 : 15:56:46
|
Hi Dr Bob
How are you?
You guys are fantastic, never expected such quick responses unlike other forums I've been to.
Mine would be version 3 per this website : http://www.stinkfoot.se/andreas/diy/articles/DD3.htm.
It's the one with loads of SMT components. :( |
|
|
|
Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/25/2009 : 16:19:38
|
Hi angusang
Have you done a thorough visual inspection?
Because it's an SMD PCB, you will probably need to use a decent magnifier,
or Loupe, X3 is a good start.
Use good light or daylight.
Perhaps if you posted some pictures of the component side.
Does it look like it was abused a lot?
You will have to remember, that the schematics for the DD-3 are impossible to locate.
Look for the mini 100mA 5V regulator, check if it's outputting 5VDC.
On the older long chip versions, the pedal still appears to power up,
even if the 5V Reg. is faulty,
but the Digital stuff remains off because of the lack of the 5V rail.
Also check for cracks or lifted pads & burnt tracks, near the DC in socket.
I don't have the version of DD-3 that you have, but lets see what we can find.
There are some pics in the Pedal internals thread, that might be useful.
Pages 10 & 12
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=10
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=4147&whichpage=12
Regards Dr. Bob 
|
Edited by - Dr. Bob on 05/25/2009 16:20:10 |
|
|
|
angusang
Copper Member
Zimbabwe
4 Posts |
Posted - 05/27/2009 : 09:06:14
|
Hi Everyone
I did my own research on the voltage regulator the DD3 version 3 and found that it's not the same as the earlier versions.
Although the threads I have seen describe the v. reg being transistor-like, the one on my DD3 is similar to the one on the left of the photos.
Anyway, I found the guts of another DD3 version 3 board in my parts bin so I can use that for photos that are for reference.
I noticed that there isn't much detail on version 3 in this forum so I hope I can help contribute as much as I can for the benefit of others.
For photos pertaining to my pedal, I will take shots of the related pedal itself.
Anyway, it seems like the voltage regulator on the DD3 version 3 is between C27 and IC8 on the board.
I assume the middle leg is ground and took voltage measurements.
I got 9V on the right side and 5V on the left; so I assume that it is
working.
The pedal internals look quite good actually, which is worrying... :)
Here are shots of the back of the board; I forgot to take photos from the component side (i'll do that later).
i have the schematic for the DD2/DD3, and although it's not for version 3, I am using it as reference in terms of the general design of the pedal.
Next up, will be a visual inspection for cracks, lifted pads,burnt tracks, etc.
What else can I check now that the v. reg has checked out OK?
Thanks
|
|
|
|
regnad
Copper Member
USA
6 Posts |
Posted - 05/30/2009 : 06:15:01
|
| i have a dd-3(b) that doesnt power up or pass any sound... shouldnt it atleast pass un effected sound? it looks like someone pluged the wrong power plug into it. the center pin has a little pitting in it like sparks flew. do the jacks need to be connected to the pedal housing in order for it to work? in other words, if i had a perfectly functioning pedal and removed it from the housing and connected my guitar to the input and amp to the output will it work with out the grounds of the jacks connected to the housing? also, Angusang, could you take a closeup of that chip? or verify its part number, asuming i did things right i have no voltage on any of the pins, but it looks like the center of the chip is toasted... |
Edited by - regnad on 05/30/2009 06:31:41 |
|
|
|
Mesjoggah
Gold Member
Netherlands
595 Posts |
Posted - 05/30/2009 : 07:32:40
|
quote:
Originally posted by regnad
i have a dd-3(b) that doesnt power up or pass any sound... shouldnt it atleast pass un effected sound? it looks like someone pluged the wrong power plug into it. the center pin has a little pitting in it like sparks flew. do the jacks need to be connected to the pedal housing in order for it to work? in other words, if i had a perfectly functioning pedal and removed it from the housing and connected my guitar to the input and amp to the output will it work with out the grounds of the jacks connected to the housing? also, Angusang, could you take a closeup of that chip? or verify its part number, asuming i did things right i have no voltage on any of the pins, but it looks like the center of the chip is toasted...
The jacks must be grounded to make the pedal work, when disassembled you could use a piece of wire and two crocodile mini clamps as kind of a jumper. |
|
|
|
Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/30/2009 : 07:33:59
|
---Edit---
I for got to say
Welcome to the forum from Australia regnad.
And thanks ccsim
- seems we were both typing a reply at the same time, & you beat me to it, or my browser didn't update correctly.
quote:
Originally posted by regnad
i have a dd-3(b) that doesnt power up or pass any sound... shouldnt it at least pass un effected sound? it looks like someone pluged the wrong power plug into it. the center pin has a little pitting in it like sparks flew. do the jacks need to be connected to the pedal housing in order for it to work? in other words, if i had a perfectly functioning pedal and removed it from the housing and connected my guitar to the input and amp to the output will it work with out the grounds of the jacks connected to the housing? also, Angusang, could you take a closeup of that chip? or verify its part number, asuming i did things right i have no voltage on any of the pins, but it looks like the center of the chip is toasted...
Hi regnad
You will have to collect a wire or clip leads between the ground pins on the input & output sockets.
That ground is normally connected through the metal chassis of the pedal.
If you have a multimeter.
Check to see if the protection diode is fried/shorted/open circuit.
Also visually check the tracks in & around the DC input socket & the protection diode.
They will sometimes be burned out because of the rev. volts/over volts condition/s.
If you have a digital camera please upload some pics regnad.
Also check the simple switch that's inside the DC power socket.
it sometimes burns out when the pedal has suffered these conditions.
Regards Dr. Bob
|
Edited by - Dr. Bob on 05/30/2009 08:03:28 |
|
|
|
regnad
Copper Member
USA
6 Posts |
Posted - 05/30/2009 : 16:42:13
|
| i was looking for some sort of protection diode or old school fuse but i have no way of knowing which is the protection diode... where is it? no burnt traces every thing looks fine. except maybe that chip angusang mentioned. ill post pics later tonight. keep the help roling though, i really apreciate<--spelling? it!! |
|
|
|
Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/31/2009 : 03:25:30
|
Hi regnad
Thanks for your PM
- As far as I am aware, "no-one here" has the schematics for the later versions of the DD-3, only the Long chip DD-2-3 versions.
Someone might upload some better pics of your version (DD-3b)
or can you take some clear closeup pics, of the area around the DC socket?
The protection diode will very close to one side of the DC power socket.
Please don't think that I'm condesending but;
Do you have the tools & skills to replace it if it is faulty?
On some DD-3's the diode is a standard axial package, and on all the newer ones it's an SMD/SMT Surface Mounted Device.
That's an interesting user name in you use for your Provider/email...
It actually caught me off guard a bit this morning.
Regards Dr. Bob
|
|
|
|
regnad
Copper Member
USA
6 Posts |
Posted - 05/31/2009 : 06:06:45
|
im fairly handy with the soldering iron. D6 was not anywhere close to the power input. i dont think d6 of the later version is the same as d6 of the older version. oh, ignore the dirty solder on d9, idnt say i could make it look like original! :)
i just saw your comment about a simple switch inside the plug, i have been trying all this with a battery only. what does this switch do?
 |
Edited by - regnad on 05/31/2009 06:11:10 |
|
|
|
Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/31/2009 : 11:47:36
|
Hi regnad
D6 is ONLY the reference for the Older DD2/3's
Even though the picture obscures the part.
It looks like D9, the diode you tried to re-solder is the protection diode.
It's the one next to the orange-tan part labeled EMI1
But just going by the hole-depression-dint in the lower right of the diode.
I would say it looks like it's been fried, unless the dint is some artifact from your camera, but it appears in more than one picture in the same spot.
Do you have a multimeter (with Diode Test function) on it?
Are you able to test the diode for us?
- FYI -
EMI1 should measure (end to end) as a short, it's basically a wire link with some ferrite beads and a couple for small "pf value" caps on it,
then it's all potted up in the orange-tan goop.
It's a common part-way of filtering out high frequency noise from power supplies - especially the new switching types.
Regards Dr. Bob |
Edited by - Dr. Bob on 05/31/2009 11:48:51 |
|
|
|
regnad
Copper Member
USA
6 Posts |
Posted - 06/01/2009 : 06:13:51
|
| yeah i took that diode out and tested it. with my meter when i set it to diode setting it displays 1.5 volts before i even touch anything. i get a .5 volt drop metering in one direction and no change the other direction. all that aside, the little switch function inside the power jack was open. i was able to fix that and the pedal will now turn on. yeah!! oh but theres no sound out the mono output, buth when the pedal is on or off. i can only get sound out the other output, but it is uneffected and does not stop even if pedal is turned off... what next? |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/01/2009 : 09:04:45
|
quote:
Originally posted by regnad
yeah i took that diode out and tested it. with my meter when i set it to diode setting it displays 1.5 volts before i even touch anything. i get a .5 volt drop metering in one direction and no change the other direction. all that aside, the little switch function inside the power jack was open. i was able to fix that and the pedal will now turn on. yeah!! oh but theres no sound out the mono output, buth when the pedal is on or off. i can only get sound out the other output, but it is uneffected and does not stop even if pedal is turned off... what next?
This sounds very much like the fault in my V3 DD-3. IC1 had failed, so there was no signal out the main output but the "direct" out was OK because it was driven by a different part of the circuit. This had happened because the pedal had received reverse voltage at some point.
http://www.bossarea.com/forum/topic.asp?TOPIC_ID=6079
|
|
|
|
Topic |
|
DD-3 version 3 problem...
