i just completed building the Mysterioso and i can't get any output at all, bypassed or engaged. i tried tracing the output jack's hot but can't find it anywhere on either of the two pcb boards. btw, i've build 1000's of pedals so i'm not new to this.
any help would be greatly appreicated
Can you provide a pic and some voltages?
Without seeing pics, I'd guess the foot switch orientation is wrong?? This one has the foot switch orientation 90 degrees from normal.
Here's a build report link, so, you can see what I mean:
https://www.madbeanpedals.com/forum/index.php?topic=34211.msg327934#msg327934
the switches are definitely oriented properly. (i.e the notches face each other). the leds all work properly, just no output.
Quote from: madbean on February 14, 2024, 09:48:08 PM
Can you provide a pic and some voltages?
all of the voltages pretty much match the build doc with the exception that i have 7.47 volts on pin 10 of the UBE4049
You uh...got any of the inside?
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here's one:
Quote from: johnk on February 15, 2024, 12:59:41 AM
here's one:
This looks pretty correct. Couple things I cannot quite tell:
Is R10 220k? I can't make out the color bands.
Ri18 looks like it might have gotten a bit charred, but again a little hard to tell from the pic.
Any chance the jack(s) are grounding out to the enclosure?
nope. they're wired correctly.
as far as R8 & R10, they're both the correct values and not damaged.
i meant R18, it measures 220K.
my biggest problem is that i can't trace the output jack's hot to anything on the switches or anywhere else on the circuit.
by the way, i appreciate all the efforts and responses in helping me try to find the issue. i'd really like to get it working.
Quote from: johnk on February 15, 2024, 03:00:45 AM
by the way, i appreciate all the efforts and responses in helping me try to find the issue. i'd really like to get it working.
Sure thing. We'll get it solved. My suggestion now is to audio probe. Specifically, probe the output pins of the ICs in order according to the schematic. We need to find out where the audio signal is dropping off.
i don't think it's dropping off. i think that output jack isn't connected to anything.
especially since it doesn't have any output when bypassed.
What about testing continuity from the daughter (foot switch) board to the main board? Maybe there's a bum lead or short.
Quote from: Bio77 on February 15, 2024, 04:11:32 AM
What about testing continuity from the daughter (foot switch) board to the main board? Maybe there's a bum lead or short.
i tried that but everything tests fine, but the output jack's hot has no continuity to the stomp switch,
Quote from: johnk on February 15, 2024, 04:44:02 AM
Quote from: Bio77 on February 15, 2024, 04:11:32 AM
What about testing continuity from the daughter (foot switch) board to the main board? Maybe there's a bum lead or short.
i tried that but everything tests fine, but the output jack's hot has no continuity to the stomp switch,
The three circled areas here should have continuity. If you have none from jack to switch, try checking the two spots circled on the main PCB.
yes, i checked those and there's no continuity. i even jumped it with a wire and the bypass works but not the effect.
is there any chance that i could get another set of PCB's for it?
it says "sold out" on the order page but i was just hoping that you might have an extra set.
Quote from: johnk on February 15, 2024, 05:48:13 PM
is there any chance that i could get another set of PCB's for it?
it says "sold out" on the order page but i was just hoping that you might have an extra set.
Unfortunately, no. I don't have an ETA yet on when I will have more, although I do plan to continue to offer the project.
I'm puzzled about the lack of continuity. The trace that connects those two points on the main PCB runs along the right edge on the top layer. Here are the traces without the tPlace layer so it's more clear. So, it is possible that there could be some nick or imperfection on that trace causing the lack of continuity. I don't see any obvious damage on the PCB but it's hard to tell from one photo.
Since you were able to get bypass with a jump wire, then the next thing to do is audio probe the effect path like I mentioned earlier. This may clue us into why the signal is not getting back to the bypass switch and then the output. Other than that, maybe a quick teardown to look at the underside of the PCB for any possible solder issues, bridges, etc.
I'm still hung up on the output blade on the jack being so close to the chassis. Maybe it's just the photo but you're sure it isn't hitting the enclosure when you plug in?
I will contribute this, I've been doing this over 10 years, I still make the occasional soldering mistake. Brian has had a few troubleshooting threads himself. Take that for what it's worth.
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Quote from: madbean on February 15, 2024, 10:49:24 PM
Quote from: johnk on February 15, 2024, 05:48:13 PM
is there any chance that i could get another set of PCB's for it?
it says "sold out" on the order page but i was just hoping that you might have an extra set.
Unfortunately, no. I don't have an ETA yet on when I will have more, although I do plan to continue to offer the project.
I'm puzzled about the lack of continuity. The trace that connects those two points on the main PCB runs along the right edge on the top layer. Here are the traces without the tPlace layer so it's more clear. So, it is possible that there could be some nick or imperfection on that trace causing the lack of continuity. I don't see any obvious damage on the PCB but it's hard to tell from one photo.
Since you were able to get bypass with a jump wire, then the next thing to do is audio probe the effect path like I mentioned earlier. This may clue us into why the signal is not getting back to the bypass switch and then the output. Other than that, maybe a quick teardown to look at the underside of the PCB for any possible solder issues, bridges, etc.
thanks for that trace diagram! i'm going to try to tace everything out.
also, please let me know when you have another batch of them made and are available.
i have a feeling that i somehow damage the trace going along the bottom edge of the main pcb but even if i did , i should be able to use jumpers to repair it.
Mysterioso mystery SOLVED!
just as i thought after testing continuity, i found two broken traces and added jumpers and it works perfectly now.
here's what i had to jump (green jumper and a jumper from blue dot to blue dot):
DONE!