SOLVED Sprit Box No Reverb

[effilctar]

Hello all, I want to take a second before I start to thank everyone on here for being so helpful when you don't have to be. I've learned a lot and I really appreciate it.

I'm building a spirit box and there is no reverb when I turn the pedal on. the LED lights, I loose a little bit of volume, but otherwise the signal is unchanged.

Could someone please tell help me with the signal path from the PT2399 to the Belton brick? I'm new to schematics and I think I'm getting turned around. I'm using an audio probe and I have signal from 12 on the PT2399, through R17, and lose it on the other side of R16. If I'm correct pin 3 pin on the brick is the input but there is no signal there. I may be reading it all wrong and everything I've just said is nonsense.

Thank you in advance.

 

[Harry Klippton]

If you're losing the signal in the other side of R16, that's a good spot to reflow your solder joints. From R16 you should get signal through R12 if I'm reading this right

 

[effilctar]

I ended up reflowing the whole board just in case with no change.

I appreciate you highlighting the signal path. It for sure goes quite after R16. IC4 has 5v in and that all seems right, but no signal on pin 6 or at R10.

 

[Harry Klippton]

I ended up reflowing the whole board just in case with no change.

I appreciate you highlighting the signal path. It for sure goes quite after R16. IC4 has 5v in and that all seems right, but no signal on pin 6 or at R10.

Make sure the ic is seated in the socket correctly and that a leg didn't miss the socket hole too. Also check your component values in the area of trouble

 

[effilctar]

This is all good advice. I reseated and tried a second IC, and I tested all the resistors and they were the correct values.

This may be a dumb question, but the side of R16 that I lose signal seems to have continuity to ground when the effect is on. Should that be the case?

 

[Harry Klippton]

No, continuity to ground doesn't sound right at all. Which side of R16 on the PCB are you losing signal? Toward the 2399 or toward the outside edge of the PCB?

 

[Harry Klippton]

I'm noticing a couple other potential issues on your board. First it looks like you might have a bridge between R15 and R16. Second, it looks like the ground leg on C101 isn't soldered. That's right in the power supply and will give you issues.

 

[effilctar]

It’s the leg of R16 labeled 2.

I’ll check the possible bridge, and I know C101 is soldered, but maybe not great. I’ll fix it.

 

[effilctar]

Sorry, toward the 2399.

 

[Harry Klippton]

Do you have continuity to all the red dots?

 

[effilctar]

I’ll be able to check this in the morning, thank you for your help.

 

[music6000]

It would pay to clean the back of the board, there is a lot of debris around that PT2399!

 

[effilctar]

I have not been cleaning them, am I correct that IPA and a little brush is the best method?

 

[music6000]

Personally I use CRC CO Contact Cleaner, No brushing required:
Just spray & watch it disappear & a 2nd squirt just in case any debris is still hangin' on:

 

[effilctar]

Fantastic, thank you.

 

[Zennmaster]

I have not been cleaning them, am I correct that IPA and a little brush is the best method?

I've had great luck with 91% IPA and an old toothbrush. Glove up, though, the residue is really sticky and hard to get off of your skin.

I'm fascinated by the CRC CO stuff, though...

 

[Harry Klippton]

I used to use IPA but now I use MG chemicals flux remover

 

[effilctar]

Do you have continuity to all the red dots?
View attachment 73395

Yes, I have continuity at these points.

 

[effilctar]

Post cleaning

 

[effilctar]

No improvement to the functionality unfortunately.