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 Forum index » DIY Hardware and Software » PAIA Equipment
paia fatman issue
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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Tue Jul 03, 2012 8:44 pm    Post subject: paia fatman issue
Subject description: constant on midi or not
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i have a fatman. i opened it the other day to re tune it. when i turned it on it just started making sound, no midi signal or anything. just output raw wave as if the gate is stuck on (yet gate LED does not light)

i sent a midi signal to it (midi LED lights) but it doesn't respond to any cv. the gate light or cv will not respond no matter the midi channel.

i've replaced every cap, every transistor, almost every IC (no replacements for dac08, or the74hc373 yet) everything else is brand new parts. oscs work, filter works VCA works, not sure about adsr because no gate is going to it.

i can get the sound to go away when i turn the velocity knob in the VCA section all the way down, not sure what that is about. all the components in the velocity sections have been replaced

nothing seems to fix it. it's a "holiday" here so i'm sure i won't be hearing from paia for a few days so i thought i'd see if anyone here has had this issue.

i have no idea what i did to it. it was working one day, but seemed to be a little out of tune, after i opened it, it started doing this.

i'm walking away now, because i feel like putting it thru the wall

thanks for any info
t
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JovianPyx



Joined: Nov 20, 2007
Posts: 1250
Location: West Red Spot, Jupiter
Audio files: 161

PostPosted: Wed Aug 08, 2012 5:47 pm    Post subject: Re: paia fatman issue
Subject description: constant on midi or not
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Sounds like the microprocessor is freaking out. I'd look at the power, especially the 5 volts. Look with an oscilloscope too...
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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Thu Aug 09, 2012 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks,

i happened to be in edmond a few weeks ago and took it by PAIA's shop and scott helped me out with it.

the piano switch had gone bad on me. it's all fixed and workin like a champ

scott over there is a cool cat. i look forward to working on more of their projects in the future
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