Yamaha DX7 velocity problem

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Yamaha DX7 velocity problem

Postby Rokk » Sun Feb 09, 2014 4:09 pm

My DX7 mk1 behaves strangely. The lowest octave of keys has a velocity problem. Sometimes velocity works, sometimes works for a second, then not, then again and again not, sometimes it doesn't work at all. When I give it a love slap it starts working again. I opened it up whe I decided to fix some key that had different response than others, but I couldn't really locate the problem. I thought the problem is in the long ribbon calbe going from keyboard to the main board, but I'm not sure.

The other problem is that when I set the pitch wheel range at more than 3 it never returns to zero (when I swing the wheel forward and releas it the pitch ends up one or two semitones higher). It's not a big problem, because I usually have it set for 2 semitones, but it's always good to have more options.

Any idea?

Thank you!
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Re: Yamaha DX7 velocity problem

Postby vcs3 » Sun Feb 09, 2014 5:07 pm

You a broken sorder somewhere in the keybed and the main board,
thats why after a "love slap" it starts working.
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Re: Yamaha DX7 velocity problem

Postby TheOuterAzure » Sun Feb 09, 2014 6:59 pm

I had the same problem years ago when I owned a DX7. I opened it and did a re-flow of every solder joint I could find on the keyboard PCB. It worked like a charm and never misbehaved after that.
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Re: Yamaha DX7 velocity problem

Postby Rokk » Mon Feb 10, 2014 11:03 pm

Yeah, I have been thinking about doing this, but taking the keyboard of is quite a project :) But I have no choice.
Hopefully I'll do it this week.
Thank you.
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Re: Yamaha DX7 velocity problem

Postby Palomino75 » Tue Apr 05, 2016 9:00 pm

I'm not sure how to start a new topic, so I'm piggybacking on this thread…I apologize if that is seen as unethical. I recently purchased a DX7 from a little old lady and I'm having some issues. It seems that no matter which algorithm I choose or even if I program a new algorithm- every time I hit a key the note descends several half steps down. Is that a stuck pitch bender or preset that she had (little old lady) set by mistake. Please help.
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Re: Yamaha DX7 velocity problem

Postby Rokk » Wed Apr 06, 2016 1:10 pm

Try it on an INIT patch. I mean, my DX7 does lots of crazy stuff, but none like this. I have one patch which utilizes the pitch envelope, so the sound begins with a bend and when I play the DX7 together with Reaper playback (DX7 being connected with midi in and out) the pitch bend at the attack stage goes all crazy and sometimes instead of being a quick, short bend it becomes several seconds long. I really have to get another DX7 in better condition.
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