GCB-95 doesn't wah anymore?

moeburn · August 25, 2005, 10:35:27 AM

I woke up one morning to find that my crybaby doesnt wah anymore. When i bypass it, it bypasses just fine, and when i turn it on, it sounds like it is stuck in the heel position. The pedal is turning the potentiometer, and i tried replacing the battery.

AL · August 25, 2005, 11:00:13 AM

GEO FX. Technology of Wah Pedals.

That happened to a friend of mine. The DC jack had gone bad and the 9V wasn't getting through to the circuit. I just bypassed it since he didn't use an adapter.

AL

vanhansen · August 25, 2005, 11:18:24 AM

Look for any lifted solder pads anywhere that you have changed any components. This happened to me. I had to run a jumper from one point to the next to fix it because I lifted a pad.

Paul Marossy · August 25, 2005, 11:23:40 AM

Quote from: vanhansenLook for any lifted solder pads anywhere that you have changed any components. This happened to me. I had to run a jumper from one point to the next to fix it because I lifted a pad.

Sounds like a possibility. Those PCBs are really easy to screw up when modding them.

moeburn · August 25, 2005, 11:33:32 AM

Ok it wahs, but only a very little bit at the low end of the spectrum. I opened it up and looked around, couldnt find anything obviously wrong.

SonicVI · August 25, 2005, 12:50:33 PM

Have you moved the pot's position relative to the gear at some point so that it's not turning into the upper range?

Paul Marossy · August 25, 2005, 12:56:17 PM

Quote from: SonicVIHave you moved the pot's position relative to the gear at some point so that it's not turning into the upper range?

That was my first thought, but I don't know how that would happen from one day to the next unless the nut on the pot came loose and the pot has shifted its position...

moeburn · August 25, 2005, 05:38:17 PM

The pot itself is fixed pretty tight in there. I measured the resistance from the yellow wire to the black wire on the pot. At toe, it was 50k, at heel, it was 95k. Could someone confirm this?

Paul Marossy · August 25, 2005, 05:42:27 PM

Have you checked the 4.7uF cap? Usually, if that goes bad, your wah becomes a volume pedal - but maybe in this case it is causing your problem?

moeburn · August 25, 2005, 05:49:00 PM

I opened it up, adjusted the pot further to the treble end, and played it. It seemed like it was working fine, then a few minutes later it just turned into a lowpass filter. It wasn't wahing or adjusting volume.

Edit: I watched the gears slipping when i slammed on the pedal really hard, they slipped really far and my wah became a bass wah. I figured the crybaby moved the pot all 270 degrees, but i was wrong. I may replace it with a 150k or 200k if they exist.

Paul Marossy · August 25, 2005, 06:28:48 PM

Maybe AL's suggestion is worth a second look...

no one ever · August 25, 2005, 11:10:57 PM

plastic gear-holder in place?

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GCB-95 doesn't wah anymore?