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 Forum index » Instruments and Equipment » General Discussion
Yamaha DX21 problems
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funkythunderstuff



Joined: Jul 24, 2013
Posts: 1
Location: Denver, Co

PostPosted: Wed Jul 24, 2013 4:14 pm    Post subject: Yamaha DX21 problems
Subject description: DX21 was playing fine during rehearsal, all the sudden volume levels became very dim.
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everything was working fine, patches, cables, battery etc. Output levels were normal, than the levels (all patches) have become VERY dim. I still get output but barely anything. I would love any suggestions, i am fairly knowledgeable with Synths, especially the DX series and FM synthesis.

Also i have looked inside, nothing looks blown or corroded (to the naked eye)..

Thanks for the HELP!!!
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DES



Joined: Feb 28, 2003
Posts: 683
Location: New Jersey
Audio files: 6

PostPosted: Sun Jul 28, 2013 1:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmm, hard to say. Some synths (Alesis QS series for example) as well as pro audio gear use FET's on the outputs to reduce/eliminate the 'pop' that happens when you turn the gear on or off. When the FET goes bad, it shorts, or nearly shorts, the output so the volume gets very low. quick fix is to simply remove the FET's but you will get pops when you turn the gear on or off. Then replace the FET's once your replacements come in.

Do you have a schematic of the DX21? If so, see if it has FET's across the outputs. If there are, simply remove them to see if the volume comes back.

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