Yamaha DX7 - Need help fixing loud crackling noise

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Joined: Sat Jun 15, 2019 9:58 pm

Yamaha DX7 - Need help fixing loud crackling noise

Post by head84 » Sat Jun 15, 2019 10:00 pm

Hi, I have a problem with an old DX7. The keyboard works just fine, but a loud crackling sound occasionally comes and goes.

Please find the attached YT video (loud volume alert)

Here is what I tried so far:

- Replaced the volume slider pot
- Resoldered controls boards and main boards joints
- Replaced the 3V battery
- Checked for any loose connection on ribbon cables connectors: there are no loose connections, and the noise wont go away touching a specific connector.

Could you please give me some help?

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Posts: 19
Joined: Sat Mar 16, 2019 12:11 pm
Gear: 4) korg RADIAS-R on big rack, 4) roland integra7, roland xv5050 2 emu proteus 2000, 2 Yamaha 4 studio rooms.
Location: Ottumwa, Iowa 52501 usa

Re: Yamaha DX7 - Need help fixing loud crackling noise

Post by iowagold » Thu Jul 04, 2019 9:58 pm

sounds like bad cap or caps.
how much test gear do you have?
what is your location?
yes I work on these
Paul in Iowa

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