Testing Pressure Response

[c7sus]

I'm trying to figure out if the keyboard pressure is working correctly on my EB. I'm thinking that the value is fixed regardless of how much pressure I apply to the keys, but not really sure how to test this function to see if it is responding with a full range of CV.

Taking readings off the pressure output of the VX-351 I am getting a constant -4.95V regardless of how much pressure is applied to the keys.

Is there an internal trim adjustment for this by any chance?

The velocity seems to be functioning properly, although I can't get full range readings across that output either. The max I can get is about +3.5V and a minimum of about -1.00V.

Thanks in advance!

[thealien666]

Maybe your keyboard aftertouch ribbon came loose. Just remove the mod wheel assembly (two screws on top front) and very carefully bring it out to check that.

On my Old School it had come loose and was disconnected from the small board underneath the mod wheel assembly. I plugged it back in, and put a dab of hot melt glue to better hold it in place.

[LA Keys]

The voyager send midi pressure (aftertouch). If you use MIDI-OX or similar software with midi connected to the voyager you should see the aftertouch messages.

LA

[c7sus]

Thank you for the replies.

I checked the ribbon connections and they were okay. Then I had the idea to swap out the upgrade LH controller with the original and voila I now have pressure. Reading -4.97V static and +4.97V fully engaged.

So now I'm thinking it's a broken trace on the field upgrade LH controller.

I reckon I'll call Moog on Monday and see what they want to repair the controller, but I have a feeling they are going to recommend replacing it entirely. I did the upgrade years ago so it will be on me. DOH!

[thealien666]

Moog Music's service and repair department (possibly Andy?) might be able to advise you on this. It might simply be a bad contact, or cold solder joint, or it could be a defective electronic part on there (the op-amp)...

[c7sus]

I called Moog about the pressure issue a couple years back and at the time they suggested that the ribbon had failed, possibly at the connector. It never occurred to me back then to swap the controllers to test the function of the ribbon. My EB is a very early model and I did the field upgrade of the analog board and controller years ago. I didn't send it in for repair because i'm not fond of the idea of shipping my baby cross country.

I'm going to call tomorrow and find out if they will sell me just the LH control board so I can swap it out myself.