Bad Horsie help

[Somicide]

I have my Guitar teacher's Bad Horsie, and I can get out of paying for the lessons for awhile if I fix this thing;  any experience with these pedals? This is the first one I've ever had the experience of fixing.  Help'd be appreciated.  Thanks,

PnL,
Jeff

[Paul Perry (Frostwave)]

You will have to tell us what exactly is the complaint, same as if you go to a doctor.
But, a weak point in these LED/LDR shutter devices is the alignment of the LDR. I've seen other Morley wahs like this come from the factory so badly aligned as to be useless.

[Somicide]

Ok, yea, symptoms would be good, no?

Ok, It Turns on when plugged in, but no signal goes through.  Hums.  Thats it.  Nothing, no wah, no clean, nada.  Better description?

PnL,

Jeff

[Transmogrifox]

open the thing up, take the board out (it's relatively easy to do), and measure the supply and ground voltages on the op amp IC, then check the "V/2" reference.  If all is good there, and all of the op amps are measuring about V/2 (nominally 4.5V), then start checking the transistors.  

With my morley, the inductor had some broken wires that needed to be soldered back very carefully---but the symptom was a mild volume swell and no wah.


Your BH problem to me sounds like something to do with the bypass mechanism, which may be due to the LED/LDR alignments, all through to the JFETs.  It wouldn't surprise me if it was inadvertently reverse connected once and the CMOS inverter chip was toasted--or got ESD'd.

If you can't determine anything about it, and it looks like the LED/LDR assembly and rocker are all aligned fine, then just take the shotgun approach and replace all of the active components (diodes, transistors, op amp, CMOS inverters, etc.)

You can find the schematic through the Morley web page.  I don't know the link off the top of my head, but it's real easy to get to through google.

I hope that helps.

[Fret Wire]

I believe Ansil has good debugging/mod experience with the Bad Horsie. I seem to remember some killer clips of his modded Morley.

[siaoguitar]

Hi, may i know what r some of the mods i can do for this Bad Horsie wah? my guitarist has 1 and he is asking me to mod for him, is it like the mod for crybaby GCB95 that i did for my own wah?

[Paul Perry (Frostwave)]

No signal and hums? sounds like a broken jack, or a crack around the PCB under the jack. Sometimes people push plugs in so hard they wreck the jacks!!!
Get a meter & see if the earth of the cable in & the cable out are connected.

[jayp5150]

Hi, may i know what r some of the mods i can do for this Bad Horsie wah? my guitarist has 1 and he is asking me to mod for him, is it like the mod for crybaby GCB95 that i did for my own wah?

If you do a search for this (on this site) you will find a ton of cool info.  I'm getting ready to try out a bunch of Ansil's suggestions over the next few days myself (after taking the time to perf the contour circuit, I think I've changed my mind, and I am going to do a completely different thing  :shock:  )

To anyone else, could I use that contour circuit as a stand-alone Q, like dunlop's?  Hmmm.