SOLVED Sea Horse Rate Not Working

[Madallop]

My Sea Horse's rate isn't working. Just sounds like a glorified delay pedal currently. What's weird, is that if I connect 1 and 2 of the Rate knob, it works intermittently with the LED rate flashing until it goes dim at the halfway point and less. All components check out fine, I've switched out the chips with other chips, and pots with other pots and can't figure out for the life of me why this is happening. Any ideas?

https://imgur.com/sspb9Gq

https://imgur.com/XGE2SNR

https://imgur.com/hGoSxWr

https://imgur.com/7G4VIxZ

 

[Nostradoomus]

Can you measure the voltage of your LM324?

 

[Madallop]

Can you measure the voltage of your LM324?

Measures at 9v.

 

[Nostradoomus]

I mean all the pins. You most likely have a cold solder joint somewhere around the rate pot/LFO section of the IC. Touch up all of these spots and see what happens.

 

[Madallop]

1: 7.83
2: 4.64
3: 5.12
4: 9.07
5: 7.81
6: 7.78
7: 7.78
8: 0.6
9: 4.67
10: 4.68
11: 0
12: 4.68
13: 1.24
14: 7.84

Hopefully that helps a bit. I've reflowed them a few times but maybe I've missed some spots.

 

[Madallop]

Reflowed but with no luck : (

 

[Chas Grant]

Double check R21 and R27, can't see R21 to well but R27 looks like 100K, doc says 10K

 

[Nostradoomus]

Yeah we can’t really double check your values for you this time!

 

[Chuck D. Bones]

I think Chas has zeroed in on the problem. The voltage on pin 3 is wrong given the voltages on pins 1 & 14. That means at least one of these resistors is the wrong value: R22, R23, R24, R27.

BTW, R22 & R23 don't do anything. EQD figured that out when they designed the Space Spiral and left them out.

 

[Madallop]

Double check R21 and R27, can't see R21 to well but R27 looks like 100K, doc says 10K

Yoooo! That was the ticket! R27 was indeed a 100K.

Thank you, super sleuths! Consider this case SOLVED!

 

[Chuck D. Bones]

Yay! Please mark it as SOLVED.

 

[Chas Grant]

SWEETNESS!