Need help for Aion Titan OCD

[aphextwin]

Hi everyone, on the pedal i builded the tone control doesnt effect in any way, the toggle switch Hp/LP is working well.
When i check the measure of the tone control leg1 and volume contro leg3, the C8 tone Capacitor seems as 77nf. The other measures i made are all down and the circuitry schematic is in the link. Thanks for any kinda help.

IC1 TL082 (18V)
1:   7.89
2:   7.89
3:   7.87
4:   0   
5:   7.40
6:   7.97
7:   7.89
8:   15.83

IC1 TL082 (9V)
1:   4.440
2:   4.438
3:   4.428
4:   0   
5:   4.184
6:   4.462
7:   4.436
8:   8.89

Project Documentation : https://aionelectronics.com/wp-content/uploads/2015/08/aion-titan-ocd-documentation.pdf

[slacker]

Very neat looking build nice work.

Check that the RX2 jumper is making a good connection in the sockets and check the soldering on the sockets and C8, a bad connection to any of those would stop the tone control doing anything.

Welcome aboard

[aphextwin]

Thanks for the help and answer, i checked the rx2 socket and C8, i even solder them again. İ also did some short circuit tests and the problem still goes on.

These r the short circuit tests i have done;
rx2 pin1-pin2 - tone pot leg 3-2 to ground.
tone pot leg1 - c8 leg1.
c8 leg2 - volume leg3 - r9, hp/lp switch.

[PRR]

Measure Ohms from tone control leg1 to ground while you turn Tone pot. Should run from 10K to zero.

Bad solder, missing jumper, or bad pot are possible.

> C8 tone Capacitor seems as 77nf.

Bah. If true, that just makes the Tone control work "too" good. That's not your problem. Anyway it is likely your cap-meter is confused by all the other stuff around C8, so "77n" really means "47n plus other stuff".

[aphextwin]

Hey there all.

After doing many controls and measures i found out what was causing the problem. The connection that u see on the schematics, the tone pot leg3 and leg2 doesnt exist on the pcb board that i have, or maybe it was damaged... whatever i added a jumper between leg3 and leg2 and the problem is solved and the knob is working well.

[aion]

Oh my goodness. Yep, that trace is missing in the design files as well, so I can't blame the factory. Sorry you had to find that one! Literally the first time that's happened in over 30 PCB designs

I added extra instructions to the project page to call this out, and I'll send out an email as well. Do you mind if I use your photo of the jumper between the rivets?

[aphextwin]

Hey there aion, sure you can use the photo. We all need to help each others. Have a great day.