Roland Clan Forums

Hi all,

I am worried one (maybe two) of the buttons on my V-Synth are defective.. the DEC(-) button has started to fail registering, or it double/triple clicks when I press it sometimes. However, I noticed many months ago that one of the effects buttons sometimes did this too, but that one hasn't gotten any worse. So I thought maybe the OS was just not debouncing enough.

I am wondering whether this is just an issue of the OS not doing enough debouncing in software, or whether the switch is truly going bad.

I'd like to know if anyone else has noticed any of their buttons doing this too. I would rather not have to open my board, de-solder the switch and replace it, only to find out that the OS is still not filtering bounces properly!

Just so everyone knows what I'm talking about: all switches 'bounce' when pressed -- to a microprocessor it appears as a bunch of very rapid on/off transitions; 'debouncing' is the process of removing these 'false' switches to avoid responding too many times to a button press. Dirty/defective switches can 'bounce' excessively, making it hard for the software to tell when the button has truly settled in a particular state.

Error 144 - Reboot? Y/N

I have the same with the INC button: double clicks.

I have a few buttons that eventually will press twice. I found a solution is to push the button gently about 30-40 times and it sort of works it out, maybe it helps get rid of the dust inside.

My INC button does this as well. I haven't noticed this happening on other buttons much but I believe it's as ArghBlarg said and a software oversight or it's failing hardware (the button contacts) from heavy or rough use. Or it could be a combination of both. My solution has been to do as Artemio said and press the button more lightly. Though I haven't noticed it eliminating the problem altogether (i.e. I don't think it "works itself out" so that you can press harder later), it hasn't become any worse either. Overall though, I'd say this is a minor inconvenience rather than a major flaw.

Regards,

Nathan Sheldon
http://www.nathansheldon.com/

Well, it might be an inconvenience to some, but I also have the problem with the Increment button (double clicks).

Seems like there are enough users with this issue to call it a hardware problem. Not a huge problem, mind you, but a problem nonetheless.

Like Artemio, I've found that a gentle press of the button seems to prevent the double-click from occurring, but why do I only seem to have this problem with the Increment button, and not the Decrement button (which gets about the same about of use)?

thanks for the reply, all.

So, it sounds like either:

a) The OS is not debouncing key presses enough,
b) Roland got some dodgy switches,

or a bit of both. The fact that we all see different keys showing this problem either suggests a little more variance in the tolerance of the switches than there should be, or the debounce function in the OS is borderline.

Anyone from Roland, who's listening, care to comment? This might merit a fix for OS v2.1, if it can be fixed in software.

Error 144 - Reboot? Y/N