Monthly Archives: May 2014

Repaired Broken Cry Baby 535Q – Extremely Loud Static When On

I bought a broken Dunlop Cry Baby 535q Wah Wah pedal recently to re-purpose as a teensy controller or passive volume pedal. When I tried it out, though, it worked perfectly. Later it started making really loud static noises whenever it was engaged. I figured it had a loose component or one that was overheating. There was an easy fix, and one I did not find anyone mentioning online, so if you have a noisy 535Q, try this.

Cry Baby 535Q

After taking apart too many pieces (hint: never remove the pot/PC board assembly if you don’t need to!) I discovered that touching a micro transistor, Q2, made it work again.

Cry Baby 535Q - Q2 Transistor - Reflowed Solder Joints

Cry Baby 535q, 9-volt Schematic
I’m not certain that this is accurate, but it looks about right. The transistors, Q1 and Q2 – MMBT5059, are bordering on non-existent. They may be Polish, but I’m not sure how to replace them.

Since pressing helped, I decided to reflow its solder joints, and that did the trick! It’s been working great for a month now. Not bad at all for $20.