Paragon!!! Only left side is working..

[l_elu]

Hello everyone thank you for the help ahead of time. I recently built this paragon overdrive. When I had first plugged it in the left side would go in and out with audio if I moved it, so I took it out of the enclosure and the problem still continued. I also noticed that the right side would not produce any sound when engaged. Also when it was engaged it would cut out the sound that I was receiving from the left side but the sound would return when I put the right side back on bypass mode… help!

 

[l_elu]

JRC4580 (Left):
1: 7.88
2: 7.88
3: 7.16
4: 0
5: 7.83
6: 7.85
7: 7.85
8: 15.65

JRC4580 (Right):
1: 7.82
2: 7.82
3: 7.11
4: 0
5: 7.80
6: 7.80
7: 7.89
8: 15.59

TC1044:
1: 8.86
2: 5.37
3: 0
4: -2.82
5: -2.78
6: 3.97
7: 5.15
8: 8.81

PWR:
8.44

1n5817:
North from left to right: 8.44 13.04 13.04
South left to right: 8:51 8.49 15.53

 

[l_elu]

I had continuity at all marker!

 

[PJS]

Looks like time for an audio probe

 

[l_elu]

Sheesh I always struggle with the audio probe. Any advice!?!?

 

[Barry]

Can't make out anything on those photos, resolutions too low

 

[l_elu]

I’m going to try upload again. How do those ic numbers look

 

[l_elu]

So I did the audio probe thing and it looks like I lose sound at R20, C15, 2ic1.2: pins 5,6,7, Tone 2

 

[l_elu]

Is it safe to say it’s R20

 

[giovanni]

Do you have signal on leg 2 of drive 2?

 

[l_elu]

Yes

 

[giovanni]

Maybe the drive pot is busted? That, or you have a cold solder along the way. Regardless, if you don’t have signal after it, that seems suspicious.

 

[l_elu]

On the 3pdt switch I get signal at:
Left 3pdt: 1, 2, 6, 7, 8
Right 3pdt: 1, 2, 6

 

[l_elu]

Does that look accurate?

 

[l_elu]

Here are the pics my iPhone camera is cracked but…

 

[giovanni]

What about on lug 3 of drive 2? If you have signal there but not after R20, make sure R20 doesn’t have cold joints.

 

[zgrav]

given that sound was coming and going when you were moving it in the enclosure, you at least have either a cold solder joint or point where it is shorting to ground.

 

[l_elu]

I didn’t have sound on the right side when moving it though… I’m going to drive and replace the drive 2 pot

 

[zgrav]

I didn’t have sound on the right side when moving it though… I’m going to drive and replace the drive 2 pot

Understood. That just means you have more that one thing to fix. I would not necessarily change out the drive pot yet. You can confirm you have continuity between the lugs and the parts on the board they connect to. Also check the resistance between lugs 1 and 3, and the resistance between 1 and 2, and 2 and 3 at each end of the pot rotation and when it is in the middle.

 

[l_elu]

So I went back and touched up the solder and melted some solder on all the pots and both points… (while doing so one of the cables that was soldered to the leg fell of so I replaced it) started to get sound on the left side going in and out with movement. I almost stopped there but had to go in for a deeper dive. So I went back to the audio probe (my previous nemesis) and found something strange. I would get sound on the pad of gain lug 3 but not on the lug itself… and I was able to strum my guitar, move the pedal and use the audio probe. So I went back and changed out the pot and there you have it. Sounds as sexy as my first one… now I’m not sure what to do for the rest of the day haha I was planning full day of trouble shooting! Once again thanks to everyone that helped!!!!
Just wondering as I’m going to take measurements