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moonmarkcus
Silver Member
Nicaragua
224 Posts |
 Posted - 01/27/2010 : 16:53:01
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This DS2 was rusted and changed transistors and caps...before that it was completely dead, but after components change, it sounds on by pass mode and when I press the footswitch, led is on but no output sound...
What else can I do to bring it to life? |
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moonmarkcus
Silver Member
Nicaragua
224 Posts |
Posted - 01/29/2010 : 15:07:59
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I did another change...( resistors and D4 and D5) but without success |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 01/30/2010 : 20:23:55
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You need to provides with a bit more information about the current state of the pedal, otherwise, no one will be able to help you.
Have you established, from input to output, what stages of the pedal are working or not ?
I would start with an audio probe or scope to see how far the input signal propagates inside the pedal and try to repair possible faults if there is no output at a given stage.
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moonmarkcus
Silver Member
Nicaragua
224 Posts |
Posted - 02/01/2010 : 15:49:23
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| OK, I will make an "audio probe"( headphones, I guess) , scope is not available to me... Im just a kid with problematic pedals !! |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 02/01/2010 : 18:01:37
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I don't remember the exact link but Dr. Bob produced a tutorial on how to build a very nice audio probe.
Maybe someone else can point to the exact link. |
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Scarymonsta
Bronze Member
United Kingdom
90 Posts |
Posted - 02/01/2010 : 20:48:03
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An audio probe will certainly help you trace back through the signal path.
However, I cannot stress enough how important it is to visually inspect the board first. The majority of faults are due to bad joints, incorrectly fitted components, broken wires or PCB tracks etc.
Make sure you have some good lighting and some form of magnification to help look at solder joints, component values etc.
Check all the wiring is OK - pedals aren't really designed to be repeatedly taken apart and soldered/de-soldered by us mad men ! They are quite delicate and can be damaged easily. Check for broken and damaged wires.
Check all the solder joints - are they all good?
Make sure there are no short circuits across components or tracks due to soldering.
Are all the PCB tracks OK and not de-laminated/broken?
Are all the components you replaced the correct type, value and placed in the PCB in the correct orientation - I have PM'd you a document to help you check this.
Check and double check all these things first and let us know what you find.
Most problems can be found this way first.
Cheers
Chris |
Edited by - Scarymonsta on 02/01/2010 20:52:52 |
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Topic |
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DS-2 , NO AUDIO WHEN EFFECT IS ON
