Dead Keys

Ivorys88 · Post by **Ivorys88** » Fri Aug 22, 2014 6:24 am

Has anyone ever experienced after turning on a Kronos 61 some keys have no sound. It seems they all come back to normal after several restarts. My board is three years old and I'm wondering if I need to replace my hard drive. I baby this board and transport it in a Gator hardshell case so it's not like it gets banged around. I'm not losing any data. Would appreciate some feedback fellow Kronarians.

geoelectro · Post by **geoelectro** » Fri Aug 22, 2014 12:32 pm

Is there any pattern to the dead keys? Is it random or groups of 8 for example.

Geo

Andriessen · Post by **Andriessen** » Fri Aug 22, 2014 1:14 pm

I have the same problem: http://www.korgforums.com/forum/phpBB2/ ... 070c007da4

I thought is had to do with the contact strips.

geoelectro · Post by **geoelectro** » Fri Aug 22, 2014 1:31 pm

A single dead key is likely some dust or the like under the key contact. A group of keys is likely a bad connection between the keyboard and circuit boards. Keys are typically scanned in groups of 8 that that is an indicator.

Spilling something into the keyboard can cause the above symptoms depending on what damage any liquid causes.

Geo

Bertotti · Post by **Bertotti** » Fri Aug 22, 2014 2:47 pm

Oddly enough at least twice, the first time I thought I imagined it because it started working but a couple days ago it happened again I switched combis and it all worked and when I came back to the other combi it worked. i think it is time to clean mine out, dust does seem like a serious possibility. I live off a gravel road and the dust is alway present. I never used a board cover but perhaps I should make one up. I do have some leather laying around.

I will pull mine apart and clean it out I will let you know if the problem reoccurs, or if I find any significant contamination/debris. I will capture a few pictures if you would like. I will tackle this task this evening or tomorrow morning. Currently 0948 my time Friday.

Geo mine was a couple keys not in the same area. I am certain it is a dust issue.

GregC · Post by **GregC** » Fri Aug 22, 2014 3:05 pm

I use a clear plastic cover on my 88 when its not on. Whats also good about that is that it is safe, when covered, to plop a book or headphones, etc on my board. don't have any scratches or marks.

dust is common where i live, etc. Every week or 2, i clean my monitors and TV screen of the dust buildup

Bertotti · Post by **Bertotti** » Sat Aug 23, 2014 10:33 pm

Blew her out no problems just bits of dust and one tiny little bit of something like dirt or litter, probably the problem. All works great now.

pedro5 · Post by **pedro5** » Sun Aug 24, 2014 12:35 am

Bertotti.
Glad to hear it works now.

Where are the photos ....????

How far did you strip the parts ?
Did you actually remove the rubber contacts etc ?

Bertotti · Post by **Bertotti** » Sun Aug 24, 2014 12:47 am

No one posted a desire for photos so I didn't take any but it is a quick process I can certainly open it back up and snap some if you would like. Maybe a go-pro vid, or photos I can do either. What would you like to see?

I only pulled the bottom off and blew her out a bit, I did not remove any contact or anything like that. I did hold the keyed vertical and play each key a bit to dislodge anything I thought might be in there. I wasn't sure how well that would work but so far so good.

Pulling it apart again shortly picture by morning.

Bertotti · Post by **Bertotti** » Sun Aug 24, 2014 3:34 am

Not the best pics. I should have waited till morning, a bit tired and not my best work. Anyway here you go. I did not unplug the keyed or pull the contact strips out. All I did was first hold her vertical and play the keys a bit then flipped over I blew the area under the keys out with some clean air. You can still see a bit of fuzz stuck to some edges. There is also a small ribbon cable to be wary of. I used rolled up bedding to support ht eKronos while upside down. I have nothing better to use and you need to place it so there is no weight on the keys.

http://images.nikonians.org/galleries/s ... ?cat=27204

pedro5 · Post by **pedro5** » Sun Aug 24, 2014 10:14 am

Excellent response,thanks.

Interesting to see inside the Kronos.

Glad that there wasn't a need to strip it down further……..what goes in, comes out via the same route,I suppose.

Best Wishes.

Bertotti · Post by **Bertotti** » Sun Aug 24, 2014 11:26 am

That was my thought also but there is always the chance I just got lucky. You really should have some proper foam packing to support the Kronos and protect the knobs, joysticks and such and a proper bench to work on. I have none of this so I used my bed. I certainly wouldn't go much deeper under those conditions.

Oh and remember use proper anti static measures like grounding a grounding strap this is basically a computer inside and static can realy ruin your day.

Ivorys88 · Post by **Ivorys88** » Tue Aug 26, 2014 2:14 pm

Thanks for all the feedback but ironically I knocked on my board like someone knocking on a door and it works fine now so I don't know if I dislodged a piece of dust or dirt but seems to work fine. Perhaps my hard drive was sticking?

Bertotti · Post by **Bertotti** » Tue Aug 26, 2014 2:38 pm

No HDD the Kronos has an SSD. More then likely some debris.