Bypass sucks tone when pedal is plugged in

[tyronethebig]

Hello all! I have my my second build done, its an EasyDrive. It was built on a PCB and was working fine for a few weeks and then I decided to paint the box. Well when it was put back in the bypass mode cuts a lot of my highs out. When I unplug the pedal from the power, the highs come back!

I used Beavisaudio's wiring diagram as a reference and as I've said, it worked like a charm for a few weeks. Could this happen if the ground connecting to the DC jack is messed up?

I've googled and searched and all I could find were some older threads about wah pedals. Any help would be appreciated

[ayayay!]

Got a meter?  Place the pedal in bypass and measure the DC on the input. 

[jasperoosthoek]

It sounds like the input is not disconnected in bypass mode. That explains the difference when you turn on the power. Do you have true bypass or a SPDT switch only switching the pedal output jack between the pedal input jack and the effect output?
Surely something is miswired.

[tyronethebig]

The DC is 4.71 at the input of the PCB in bypass mode. Is this the input you meant?

I am using a 3dpt truebypass. I'll look over my wiring again, but it was working fine before it was removed for case painting. The only two wires that were clipped and re-soldered were the + and - to the DC jack. Thanks for the help!

[jasperoosthoek]

Is this the one you mean?

Could you please add the schematic the next time you post a question? 

Anyway, it looks like either the 0.1uF input cap is internally shorted (unlikely), the input of the PCB is the wrong side of the cap, or maybe there is some solder across the cap shorting it externally? The PCB input voltage should be around zero. Not 4.7 volts...
It is also important to know effect input voltage on the jack. It looks like the PCB is not disconnected from the input jack in bypass mode.

(A 2 meg or bigger resistor between the input and ground helps avoid switch popping btw, leave it if it doesn't pop.)

[tyronethebig]

Its alive!! The output jack was touching the enclosure then the chord was plugged in 
I'm getting the hang of this forum thing, ill have schematics next time (that was the one btw). Thanks a lot man, I added a resistor for pops while i had the iron hot.
I'll post a few pics in the picture section in a few (though its nowhere near the glory of the "M Pi Strikes Back")

peace

[jasperoosthoek]

Good work! So taking it out was to blame afterall. Now it's really improved .