ADA Preamps > MP-2
MP2 Wah issues.
kawai2g4b:
Hey, I'm a recent convert to ADA equipment. I purchased an MP2 about a month ago off Ebay and upon firing it up, I noticed that the wah, when activated, does not sweep. In every setting, be it with the pedal or on the auto wah setting, I get a fixed wah tone when engaged. I even programmed the pedal to trigger the wah effect on at different points in its sweep. Before the triggering point, I get the normal signal. When past the point, I get the fixed wah. Is there anybody in here with any experience with such or problem or has the knowhow to how to approach a repair. I do have a local repair tech with experience on ADA racks but some extra guidance would do me well.
:dunno:
Thanks in advance!
rnolan:
Marshall JMP may be able to help with tech aspect, I've always used my wah on triggered so it activates on each pluck. I only got one pedal (and the quad switch) with my MXC which I assign to Master Vol. so I've never used it as a "normal" wah as such. You could restore factory defaults just to make sure it's not some issue with pedal assignments or other wah settings. I'll have a fiddle with mine and see if I can discover anything else that may help.
Cheers Richard
kawai2g4b:
Yeah rnolan, I am running the same setup you have...through the MXC, Continuous Controller, and pedal, though I have two of them to run volume and wah. I reprogrammed the wah from pedal, to triggered and every which way possible (even when triggered halfway up the pedal) but the filter stays in the same position...its like it goes to instant Clapton woman tone, but in a bad way. Im glad the programming works as it should, but this is the only glitch in the entire preamp, and it might just be a loose connection (i'm a bit electronically challenged). It came like this when I unpacked it from an ebay purchase. Is seems as though I got fleeced for $250 plus potential repair costs but the guy incuded all the pedal gear along with it so maybe not so much. I'll try to get a hold of Marshall JMP for his opinion. Also, there is a rack mod tech at this link in Houston, near where I am, that I will go to for repair/modding:
http://www.thetonedoctor.com/default.html
http://www.thetonedoctor.com/Price-List-Shop-Online.html
BTW, anybody in the forums familiar with this guy?
MarshallJMP:
Well i have read your post but i must say i never encounterd such a problem with the mp-2.But what you could try is setting trimpot TR202 to a different position (but remember the original setting in case this doesn't help).This trimpot is part of the sweep circuit,so try it out.
Another thing could be U216,this is a vactrol (light depended potentiometer) and thirt option the opamps U205 and U207 (OPA2604AP),these get very hot and sometimes they fail (a known issue in mp-2's).These are easy to replace because they are in a ic socket.
So try these out,if it doesn't help we need to do some measurements.But that's for later.
rnolan:
$250 with all the pedals is a good deal I recon (not that I'm checking MP2 prices that often). I paid $700 AUD for an MP2 for a friend. That included shipping (Hong Kong to Australia) but with one pedal and one quad switch. I also bought another MP2 from him for my studio as he said it was a bit intermittent and crashed sometimes, that cost $200 AUD with no pedals but included a Midiverb 4. I think I paid AUD $2500 ish for my first (new) MP2 when it first came to Australia.
While (if) you pull the lid off you should check the EPROM version and if it's not the last one made (v1.41) buy the upgraded EPROM from MJMP (http://www.marshalljmpmodshop.net/miscellaneous_parts_and_replacement_tubes.htm), it's easy to fit. Main improvement that I noticed with it was faster program changes. Your tech will probably need the schematics which you also can get from MJMP's site. I have the basic one that was available on the old depot. If you PM me your email address I'll send you what I have. Do you have the MP2 user manual ? That "may" shed some light on the wah issue ?
Cheers Richard
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