I'm working on a Mark 12 for my church. One key will stick (not mechanically) with permanent sustain until it gets pressed again. It is most sensitive to quick attack presses & releases. I've cleaned the PCB contacts and the contact in the rubber membrane, but without any luck. The only other information I can provide is: 1) when I removed the console and tipped it over, a small piece of plastic fell out from the same area as the affected key, 2) I noticed a very, very slight difference in the feel of the key, especially when it is released which may be causing contact bounce and latching up some logic in the keyboard scanner?? 3) when pressing the key, there is a very slight, almost indistinguishable "tick". I've taken the key out and inspected the counter weight, but can't see anywhere where the plastic piece may have come from. I'm not quite sure how to completely remove the counter weight yet. Any clues or suggestions for the next time I go inside this thing? Please respond to newsgroup only. I can't take the flurry of spam every time I post my email address. Thanks!
On Tue, 27 May 2008 19:37:40 -0500, Rick N Pam wrote: > I'm working on a Mark 12 for my church. One key will stick (not > mechanically) with permanent sustain until it gets pressed again. It is > most sensitive to quick attack presses & releases. I've cleaned the PCB > contacts and the contact in the rubber membrane, but without any luck. The > only other information I can provide is: 1) when I removed the console and > tipped it over, a small piece of plastic fell out from the same area as > the affected key, 2) I noticed a very, very slight difference in the feel > of the key, especially when it is released which may be causing contact > bounce and latching up some logic in the keyboard scanner?? 3) when > pressing the key, there is a very slight, almost indistinguishable "tick". > > I've taken the key out and inspected the counter weight, but can't see > anywhere where the plastic piece may have come from. I'm not quite sure > how to completely remove the counter weight yet. > > Any clues or suggestions for the next time I go inside this thing? > > Please respond to newsgroup only. I can't take the flurry of spam every > time I post my email address. > > Thanks! I wonder if it is feasible to swap the key and the rubber part with some other key that isn't played often such as the far left or right key. Another idea is to remove a neighboring key to see the action on the rubber thing. I wonder if the small plastic part was inside the rubber part? Just a guess. I have a Mark 10 I just spent a few weeks fixing. I notice the middle group of keys squeak a little in case you know about squeaks. Good luck
I just spent an hour working on the keyboard before I came home and found your reply this evening. Oddly enough, I had thought to swap sections of the rubber membrane and that is why I went there tonight. The problem did move with the membrane. Now, I need to find a source for Kurzweil parts! any suggestions? "me" <> wrote in message news:BtI2k.211$... > On Tue, 27 May 2008 19:37:40 -0500, Rick N Pam wrote: > >> I'm working on a Mark 12 for my church. One key will stick (not >> mechanically) with permanent sustain until it gets pressed again. It is >> most sensitive to quick attack presses & releases. I've cleaned the PCB >> contacts and the contact in the rubber membrane, but without any luck. >> The >> only other information I can provide is: 1) when I removed the console >> and >> tipped it over, a small piece of plastic fell out from the same area as >> the affected key, 2) I noticed a very, very slight difference in the feel >> of the key, especially when it is released which may be causing contact >> bounce and latching up some logic in the keyboard scanner?? 3) when >> pressing the key, there is a very slight, almost indistinguishable >> "tick". >> >> I've taken the key out and inspected the counter weight, but can't see >> anywhere where the plastic piece may have come from. I'm not quite sure >> how to completely remove the counter weight yet. >> >> Any clues or suggestions for the next time I go inside this thing? >> >> Please respond to newsgroup only. I can't take the flurry of spam every >> time I post my email address. >> >> Thanks! > > > I wonder if it is feasible to swap the key and the rubber part with > some other key that isn't played often such as > the far left or right key. > Another idea is to remove a neighboring key to see the action on the > rubber thing. > I wonder if the small plastic part was inside > the rubber part? Just a guess. > I have a Mark 10 I just spent a few weeks fixing. I notice the middle > group of keys squeak a little in case you know about squeaks. > Good luck >
"Rick N Pam" <> wrote in message news:... >I just spent an hour working on the keyboard before I came home and found >your reply this evening. Oddly enough, I had thought to swap sections of >the rubber membrane and that is why I went there tonight. The problem did >move with the membrane. Now, I need to find a source for Kurzweil parts! >any suggestions? Contact Duane Garvin through www.dgaudiorepair.com is one suggestion. Otherwise, www.kurzweilmusicsystems.com has links for authorized service, and a request form to contact them directly. Jim
On Mon, 09 Jun 2008 22:11:40 -0500, Rick N Pam wrote: > I just spent an hour working on the keyboard before I came home and found > your reply this evening. Oddly enough, I had thought to swap sections of > the rubber membrane and that is why I went there tonight. The problem did > move with the membrane. Now, I need to find a source for Kurzweil parts! > any suggestions? > > "me" <> wrote in message > news:BtI2k.211$... >> On Tue, 27 May 2008 19:37:40 -0500, Rick N Pam wrote: >> >>> I'm working on a Mark 12 for my church. One key will stick (not >>> mechanically) with permanent sustain until it gets pressed again. It is >>> most sensitive to quick attack presses & releases. I've cleaned the PCB >>> contacts and the contact in the rubber membrane, but without any luck. >>> The >>> only other information I can provide is: 1) when I removed the console >>> and >>> tipped it over, a small piece of plastic fell out from the same area as >>> the affected key, 2) I noticed a very, very slight difference in the >>> feel of the key, especially when it is released which may be causing >>> contact bounce and latching up some logic in the keyboard scanner?? 3) >>> when pressing the key, there is a very slight, almost indistinguishable >>> "tick". >>> >>> I've taken the key out and inspected the counter weight, but can't see >>> anywhere where the plastic piece may have come from. I'm not quite sure >>> how to completely remove the counter weight yet. >>> >>> Any clues or suggestions for the next time I go inside this thing? >>> >>> Please respond to newsgroup only. I can't take the flurry of spam every >>> time I post my email address. >>> >>> Thanks! >> >> >> I wonder if it is feasible to swap the key and the rubber part with >> some other key that isn't played often such as the far left or right >> key. >> Another idea is to remove a neighboring key to see the action on the >> rubber thing. >> I wonder if the small plastic part was inside >> the rubber part? Just a guess. >> I have a Mark 10 I just spent a few weeks fixing. I notice the middle >> group of keys squeak a little in case you know about squeaks. Good luck >> >> This may not help much but I made a couple of parts for the Kurzweil I fixed. There were a couple of push buttons missing from the control board and I made them by grinding down small pieces of wood with a bench grinder to get the sizes I needed. One of them was originally lit by an LED in the bottom of the push button well and I drilled a hole in the new wooden button to let the light through to the top of the button and then I put a small amount of epoxy in the hole to make it look like a clear lens. On one of the buttons I had to make a small L shaped flat piece of metal to glue onto the side and bottom of the wooden button to be an offset as the actual push button switch on the circuit board was off to the side a bit in the hole for the push button. I also drilled small holes in the bottom of the two switches and fished some fishing line from one to the other underneath the control board to make them captive so they won't fall out. I painted them black with a black marks a lot felt tip pen. The foot pedals were broken as someone pushed on them so hard they broke out of the plastic box they were mounted in. I keep a cache of plastic parts that can be melted with a wood burning tipped solder gun that solidify into a strong piece of plastic when cold and used this to melt a new plastic box into place. It wasn't strong enough so I reinforced it with one of those metal repair strips with pre drilled holes from Ace Hardware. Two of the springs had fallen out but Ace Hardware had the exact springs for some reason. This may have been more than you wanted to know but might serve as an inspiration of some sort. What is broken on your Kurzweil?
