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Thread: Help! - Gain knob not working

  1. #1
    Tone Member waltschwarzkopf's Avatar
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    Default Help! - Gain knob not working

    Hi guys,

    I recently bought a used TC electronic Röttweiler distorsion pedal. It’s in mint condition and came with the original packaging. I plug it in, sounds great, bass/treble work, level works but the gain does not work.

    I tried different amps and cable, the pedal alone and with others but the gain does not increase nor decrease.

    I managed to take it apart to look at the board and at first sight nothing looked burnt or rusty. Put it back and the problem was still there.

    Any advise on what I could do? Or how to check things further?

    Cheers,
    Walter
    "I don't want to be a product of my environment, I want my environment to be a product of me."

  2. #2
    Sock Market Trader GuitarStv's Avatar
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    Default Re: Help! - Gain knob not working

    Could be a bad solder joint, you can just heat up the joints around the pot and let the solder reflow to fix that. Could be dust in the pot (which would require a new one soldered in).
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  3. #3
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    Default Re: Help! - Gain knob not working

    Try reflowing the solder joints as GuitarStv suggests if you can. Easier said than done without having seen the inside of the pedal however. The same could be said for replacing the pot in question. Couldn't find an image online of a gutshot for the Röttweiler so I'm 100% sure of the degree of difficulty. If you could post one that would determine how hard it would be.

  4. #4
    Tone Member waltschwarzkopf's Avatar
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    Default Re: Help! - Gain knob not working

    Hi guys,
    Thanks for the suggestions!
    I’ll try to post some inside pictures tomorrow.
    On Monday I can try to reflow the joints with the tools at work.
    "I don't want to be a product of my environment, I want my environment to be a product of me."

  5. #5
    Mojo's Minions devastone's Avatar
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    Default Re: Help! - Gain knob not working

    In the meantime, just try twisting the knob back and forth fairly aggressively a dozen or so times, if there is some corrosion in the pot that might clean it up enough to get it working.

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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by waltschwarzkopf View Post
    Hi guys,
    Thanks for the suggestions!
    I’ll try to post some inside pictures tomorrow.
    On Monday I can try to reflow the joints with the tools at work.
    This is an image of the pots from the TC Electronic MojoMojo:

    Name:  wuPdJmp.jpg
Views: 69
Size:  121.7 KB

    Probably very similar or if not the same build specs in terms of layout as the Röttweiler. Will be very easy to reflow the solder joints and replace the pot if need be. They're 9mm Alpha right-angle pots, quite common so getting a replacement won't be too difficult. Will run you a couple of bucks from somewhere like Small Bear Electronics. The value will be written on the pot itself. They're sealed pots, so you won't be able to use any contact cleaning if reflowing the joint doesn't work.
    Last edited by BlakeC27; 05-17-2019 at 11:49 PM.

  7. #7
    Tone Member waltschwarzkopf's Avatar
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    Default Re: Help! - Gain knob not working

    Hi guys,
    Thanks again! I reopened it and saw some dust/White substance/powder on the board. What could it be and how do I clean it? Toothbrush? Compressed air? Indeed, looks almost identical to the MojoMojo. Have a look for yourselves!











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  8. #8
    Tone Member waltschwarzkopf's Avatar
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    Default Re: Help! - Gain knob not working

    BTW, I contacted the seller and he said it worked fine for him. THEN, he put it in its box for two years and sold it...

    I guess he didn’t stored it in a cool-dry-place nor he tested it before shipping...


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  9. #9
    Little Pigbacon
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    Default Re: Help! - Gain knob not working

    I’ve seen that kind of residue inside a fair number of products that worked fine. I always thought it was an manufacturing artifact. Anyone know for sure?

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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by Little Pigbacon View Post
    I’ve seen that kind of residue inside a fair number of products that worked fine. I always thought it was an manufacturing artifact. Anyone know for sure?
    For the photos Walt posted, it looks like flux residue to me. Left behind from the manufacturing process.

  11. #11
    Toneologist Obsessive Compulsive's Avatar
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    Default Re: Help! - Gain knob not working

    What did you expect to hear? From my experience gain knob does nothing noticeable if any. Pan that knob from min to max see if you notice a change in sound. Also, check out the demo on youtube.

  12. #12
    Tone Member waltschwarzkopf's Avatar
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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by Obsessive Compulsive View Post
    What did you expect to hear? From my experience gain knob does nothing noticeable if any. Pan that knob from min to max see if you notice a change in sound. Also, check out the demo on youtube.
    I expected to hear crunch to lead while turning the knob... but now Im thinking this is a balls to the wall full time full gain pedal (which is ok).

    I took a toothbrush and brushed the board carefully to remove most of those residues. Then, I plugged the pedal alone to the amp and a guitar. I strummed the low e and let it ring while turning the knobs. Treble, Bass, level and the switch do change very noticeable. The gain knob now does change the sound, but very faintly. The saturation seems to increase as it turn it up (CW), although the gain remains pretty much the same.

    Is this normal? I’m gonna check the demos again, maybe I missed that... Since I have oder OD and distortion pedals, I’m ok if this is full gain, as that it was my main purpose. I just didn’t want to get ripped off.


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  13. #13
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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by waltschwarzkopf View Post
    I expected to hear crunch to lead while turning the knob... but now Im thinking this is a balls to the wall full time full gain pedal (which is ok).

    I took a toothbrush and brushed the board carefully to remove most of those residues. Then, I plugged the pedal alone to the amp and a guitar. I strummed the low e and let it ring while turning the knobs. Treble, Bass, level and the switch do change very noticeable. The gain knob now does change the sound, but very faintly. The saturation seems to increase as it turn it up (CW), although the gain remains pretty much the same.

    Is this normal? I’m gonna check the demos again, maybe I missed that... Since I have oder OD and distortion pedals, I’m ok if this is full gain, as that it was my main purpose. I just didn’t want to get ripped off.


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    I'm not familiar with this pedal so it could quite possible be the case. We were assuming the gain control had range of a more traditional OD/Distortion pedal in the first place.

  14. #14
    Mojo's Minions devastone's Avatar
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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by Little Pigbacon View Post
    I’ve seen that kind of residue inside a fair number of products that worked fine. I always thought it was an manufacturing artifact. Anyone know for sure?
    Quote Originally Posted by BlakeC27 View Post
    For the photos Walt posted, it looks like flux residue to me. Left behind from the manufacturing process.
    Exactly, just residue from puttin' it together, won't hurt anything. If it really bugs you, some alcohol on a toothbrush will take care of it.

  15. #15
    Mojo's Minions devastone's Avatar
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    Default Re: Help! - Gain knob not working

    Quote Originally Posted by waltschwarzkopf View Post
    ...but now Im thinking this is a balls to the wall full time full gain pedal (which is ok).

    I took a toothbrush and brushed the board carefully to remove most of those residues. Then, I plugged the pedal alone to the amp and a guitar. I strummed the low e and let it ring while turning the knobs. Treble, Bass, level and the switch do change very noticeable. The gain knob now does change the sound, but very faintly. The saturation seems to increase as it turn it up (CW), although the gain remains pretty much the same.
    Checking a few utube reviews on the pedal, that's how it seems to work.

  16. #16
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    Default Re: Help! - Gain knob not working

    I once tried the Mad Professor 1 and the 'Brown' control was like that. Didn't have any affect on the amount of gain, just a very change in the tone probably similar to what you described.

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