Pedal not working

jeckhart_17

New member
I just finished assembling 2 Aion FX Maelstrom bass pedal kits in the past week. The first one is not working properly, when off it passes signal, when it's turned on it doesn't pass any signal. The second pedal I put together everything works how it's supposed to. I tested the Op amp voltages most were double what they are supposed to be and I don't see anything visibly wrong other than a small amount of burnt plastic from touching the soldering iron by accident. Any help would be appreciated
 
 
Took pictures of everything and included the voltages from the IC's
 

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Check R30 underneath IC3.

According to the schematic (https://aionfx.com/app/files/docs/maelstrom_documentation.pdf), R30 is a jumper and you appear have either a 100Ω or 100KΩ installed (hard to tell from pics).

Your voltages for IC3 are off which leads me to believe that you may have issues somewhere around that IC. You should have VA (same voltage as pin 8 on your other ICs) on pins 5, 7, 9, 11, and 14 of that IC. You may have other issues unrelated to IC3, but that area may be a good start.
 
https://aionfx.com/app/files/docs/maelstrom_kit_documentation.pdf I built it based off of this schematic, on page 10 it has a 100R resistor instead of a jumper.

I have since figured out the issue as to it not working properly, I flowed too much solder and a couple pins from the footswitch were connected. Completely my fault as I'm still getting used to soldering PCB's. Another question I have though is both of the pedal have a high pitched squeal if turned up past 50% between blend/volume/drive.
 
High-pitched squeel is perfectly normal.

Well, at least for a lot of my builds it is.



Seriously though, the high-pitched squeal ...
Pull the chips from the sockets and check the component side of the PCB under the sockets with a magnifyer — if you applied too much heat to the sockets you may have drawn solder up through the holes and have a bridge formed under the sockets (check especially IC3, as Brett noted something's wrong there). Check the placement / values of all your resistors again.

Hidden solder-bridges are a bitch.


Just chucking in my non-adjusted-for-inflation 2¢ in hopes it helps.
 
High-pitched squeel is perfectly normal.

Well, at least for a lot of my builds it is.



Seriously though, the high-pitched squeal ...
Pull the chips from the sockets and check the component side of the PCB under the sockets with a magnifyer — if you applied too much heat to the sockets you may have drawn solder up through the holes and have a bridge formed under the sockets (check especially IC3, as Brett noted something's wrong there). Check the placement / values of all your resistors again.

Hidden solder-bridges are a bitch.


Just chucking in my non-adjusted-for-inflation 2¢ in hopes it helps.
I'll give it a look later on. Thanks for the suggestion!
 
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