Box and All (tone job) treble/mids issue

[AROLB]

hi there! first post here. been getting some nice help on this over at diystompboxes, in progress with it but want to see if there are any other ideas about a fix.

i've built a unit combining several circuits to incorporate a spring tank into a mixer setup. it has the Box and All board on the fx return – during the testing phase for some reason the whole treble & mids section aren't functioning, but the rest of the circuit is working well. here are the schematics
https://docs.pedalpcb.com/project/BoxAndAll-PedalPCB.pdf

my soldering has yet to be improved... so have taken in suggestion over at DIY to resolder R4, R5, R7, R8 and C3, C5, and C6. but still no improvement!

any ideas? it would appear that all the op-amp stages are currently functioning as signal passes all the way through, plus bass and volume are also active.

Just giving it one last shot in getting treble and mids working as well! below are photos with some rather messy under-heated solders, some of which has since been re-done as noted above.

many thanks!
rai

 

[BuddytheReow]

Clean the underside of your board with some IPA (isopropyl alcohol) and a toothbrush and repost your pics. Don’t get any inside your pots. You’ve got some iffy solder joints.

 

[KR Sound]

Are the backs of the pots touching the solder joints underneath them?

 

[zeropluszero]

Just built a box and all and might be having the same issue. Level and bass seem to work, mids and treble not so much? Did you find a fix at all? I couldn't see any info on diystompboxes

 

[zeropluszero]

Here's mine, exact same issue, the mid & treble controls don't do anything.
I'm aware I mis-wired the DC in jack, its since been corrected but that's the only change.

 

[music6000]

View attachment 58503


Here's mine, exact same issue, the mid & treble controls don't do anything.
I'm aware I mis-wired the DC in jack, its since been corrected but that's the only change.

Your Photo is over exposed, you can't tell what the resistor colours are at all!

 

[zeropluszero]

Let's assume they're the right values, I'll go over them tomorrow.

Another pic here

https://imgur.com/a/rmnzFBt

 

[music6000]

Let's assume they're the right values, I'll go over them tomorrow.

Another pic here

https://imgur.com/a/rmnzFBt

This is no better than the other Picture.
About 2 sort of look right, the rest are way off????

 

[jesuscrisp]

Assuming all values are correct, it's most likely user error such as bad soldering somewhere. Check IC voltages. Also check whether R6 has continuity to the upper IC's pin 2. Maybe also post pictures of the backside

 

[music6000]

Assuming all values are correct, it's most likely user error such as bad soldering somewhere. Check IC voltages. Also check whether R6 has continuity to the upper IC's pin 2. Maybe also post pictures of the backside

Until a suitable picture is Posted, I won't trouble shoot it!

 

[zeropluszero]

Here's a direct link to the second photo, should be full resolution

https://i.imgur.com/vT4CicD.jpeg

Otherwise I'll have to wait til morning to take a new one.
I painted by number from the PDF & opened the Tayda bags one by one to install all of them.

 

[music6000]

All the resistors are Correct.
Next call is Voltage on OpAmps IC1 & IC2
As drawn below , provide voltages on Pins 1 to 8:

 

[jesuscrisp]

My feeling is that there's a bad solder joint, but can't tell as long op doesn't post the underside.

 

[zeropluszero]

Does the pedal need to be powered on for that? I'll have to get them tomorrow morning for you.
I reckon that's what I've done as well, I need to remove it from the housing tomorrow to check it over again, if it is it's a crazy coincidence we have the same issue.

 

[jesuscrisp]

Well obviously measuring voltages requires that there is power on the pedal....

 

[zeropluszero]

This is genuinely my first pedal. I have a little soldering experience but nearly no electrical knowledge so please bear with me.

 

[music6000]

This is genuinely my first pedal. I have a little soldering experience but nearly no electrical knowledge so please bear with me.

Power to the pedal & with a DMM, set to DC Voltage & black probe to Ground at the top of the PCB & red probe to each pin & write down voltages.
Number 4 is Ground so you will get a near 0v reading.
Did you use Lead Free Solder?

 

[zeropluszero]

Not sure about the solder, its not labelled and is in Chinese of course.
I've taken it apart, and have reflowed the resistors and capacitors in the upper right corner, and the pots now appear to be doing something, so I think from my side we can label this solved.

 

[music6000]

Not sure about the solder, its not labelled and is in Chinese of course.
I've taken it apart, and have reflowed the resistors and capacitors in the upper right corner, and the pots now appear to be doing something, so I think from my side we can label this solved.

This is good to hear.
Do you have a DMM???

 

[zeropluszero]

I do yeh, did you want a measure of something?