Yamaha EX5R Knobs non-responsive - Troubleshoot?

The EX5 features a unique Extended Synthesis system which incorporates a number of advanced tone generator technologies. AWM2, AN, FDSP and VL. The EX5 is one of the best keyboard Yamaha ever produced.

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rocknpop
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Yamaha EX5R Knobs non-responsive - Troubleshoot?

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hey guys - looking to buy (yet one more) used EX5R but the rotary knobs are not functioning. They do not move the value in any of the screens and they do not send/generate a MIDI signal. Any idea what can be going on and if it's worth buying the rack as is?


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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

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rocknpop wrote: Sat Aug 01, 2020 8:20 pm hey guys - looking to buy (yet one more) used EX5R but the rotary knobs are not functioning. They do not move the value in any of the screens and they do not send/generate a MIDI signal. Any idea what can be going on and if it's worth buying the rack as is?
I would say it depends a lot on asking price. It maybe fixable (should look at schematics in detail) and if the rest is OK, you may grab a bargain :dance:


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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

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Asking price is $400 plus shipping. I may just do it... just want to know if I can actually fix the knobs.


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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

Unread post by jima »

All knobs non-functional suggests a board failure of some sort. You night be lucky if it is an internal ribbon connector broken loose but the probability of that is low. Can you get the diagnostics run?


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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

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Hey Jim, thanks for the reply.

Yeah, I have the technical manual to send to him so I could get the diagnostics run but after spending an hour FaceTime troubleshooting the rack I don’t think I can ask the seller for another step by step session. He said he’d sell as is for $400 + shipping.

I think it’s a bit of a risky situation, albeit, we tested everything else and it operated fine.


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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

Unread post by jima »

OK, but the knobs are critical unless you plan to drive it from a DAW so if you can't get the diags run it would be risky not to mention it is a bit of a high price for a rack with a non-minor issue.


Jim
Yamaha EX5, AN1X, TG500, Moog Werkstatt, Korg Wavestation SR, Sigma, Legacy Digital, Nord Modular G2, G2 Engine, Focusrite PRO 40, MIDISPORT 8x8/s, Uno, Arturia Keylab 49 MkII, BeatStep, V Collection, Pigments | Love keyboards but so little time :(
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Re: Yamaha EX5R Knobs non-responsive - Troubleshoot?

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Right, I passed on the rack for that reason. I decided to buy the full 76 key EX5. Now I'm coordinating shipping :)


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