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Kurzweil K2600; keys not triggering

Kurzweil K2600; keys not triggering

2012-12-11 by snowleopard

Anyone have experience with a Kurzweil K2600(s)? I have one that has a few keys that do not trigger on/off. The synth will produce those sound internally (via Midi) and the keyboard is sending out MIDI aftertouch on those keys, but not on/off at any velocity. This started with one key, then that key came back to life. Then it went out a week later, now 2-3 more keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing apart, I want to talk to someone who has pulled the hood off. I took apart a couple old analog synths, but want to get some advice before opening this beast. 

Any and all comments appreciated.

Re: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-11 by Roger J

Yes, very common failure on keyboards with rubber contacts.  You will either find debris under it or the contact is torn.  Replacement is always best and in the long run cheaper.  The contacts are FATAR and used on Korg(X5 for one), Rolands made in Italy, all Fatars and Studio Logics, Waldorf, Virus, M-audio(a Chinese copy), Nords, to name a few.  Cost $4 to 9 per group of 12 notes.  


It is also possible that you have a cable or circuit board problem, if you a group of 8 in a row or a fault every 8th key, you could have a circuit issue.  Random here and there without a math base of 8 is bad rubber contact or damage contact pad or crack at the pad or broken diode.
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>________________________________
> From: snowleopard <ppg223@...>
>To: vintagesynthrepair@yahoogroups.com 
>Sent: Tuesday, December 11, 2012 12:56 PM
>Subject: [vintagesynthrepair] Kurzweil K2600; keys not triggering
> 
>
>  
>Anyone have experience with a Kurzweil K2600(s)? I have one that has a few keys that do not trigger on/off. The synth will produce those sound internally (via Midi) and the keyboard is sending out MIDI aftertouch on those keys, but not on/off at any velocity. This started with one key, then that key came back to life. Then it went out a week later, now 2-3 more keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing apart, I want to talk to someone who has pulled the hood off. I took apart a couple old analog synths, but want to get some advice before opening this beast. 
>
>Any and all comments appreciated. 
>
>
> 
>
>

RE: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-11 by John E. Simmons/Business

Yes - these synths have the Fatar keyboard and they are notorious for this
problem.  You have to open the synth and either clean or replace the little
key contact pads.  Google Fatar keyboard repair and you will see detailed
instructions for getting to the contacts.  You can go to the Kurzweil site
and download manuals that should help you get the K2600 open.  I found
replacement contacts at midi-store.com.  There is also a Yahoo group on the
K2600  with some information and manuals for download.

John
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From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of snowleopard
Sent: Tuesday, December 11, 2012 3:57 PM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Kurzweil K2600; keys not triggering

 

  

Anyone have experience with a Kurzweil K2600(s)? I have one that has a few
keys that do not trigger on/off. The synth will produce those sound
internally (via Midi) and the keyboard is sending out MIDI aftertouch on
those keys, but not on/off at any velocity. This started with one key, then
that key came back to life. Then it went out a week later, now 2-3 more
keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing
apart, I want to talk to someone who has pulled the hood off. I took apart a
couple old analog synths, but want to get some advice before opening this
beast. 

Any and all comments appreciated.

Re: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-11 by John Henson

Hi Snowleopard,
I am assuming you are referring to the 72 key model.
The aftertouch and key trigger systems are separate, so you can have one 
without the other. It sounds like keyboard contacts all right.
Could liquid of some sort have got in there? When a group of adjacent 
notes stop working then this is a common cause. If they are scattered 
about the keyboard, then it is time to strip and clean the whole contact 
system, accumulated dust build up over the years will start to affect 
more and more keys as time goes by.

Regards,
John.

RE: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-12 by Lorne Hammond

If its like the K2000 you will find a number of section of rubber bubbles
with carbon inside that bridge two carbons on the pcb.  There are a number
of nubs or pins, some small end ones are bigger that push through holes in
the pcb.  It it loose it wont make contact.  They go on in A SPECIFIC ORDER
SO I'D PHOT IT BEFORE DISSASEMBLY OR MARK IT.  If the rubber is sound it
could be contacts, cleaned with a hrd grey eraser (not the dumb pink ones).
If it's the contact in the bubble you might want to use one of those $15
repaint kits.  I use a straightened paperclip to push those pins back into
the board.  I have had mixed results with repairs but the one that worked
was to buy a used assembly and take a high or low octave (less use)
especially if its around your middle c that is not working.  Those grey
bubble strips have to go back exactly, one pin up and you will have to pull
it all apart again.  So look carefully as you disassemble.  I think it's a
fatar keyboard.  Most are.

 

Lorne in canada.
Show quoted textHide quoted text
From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of snowleopard
Sent: Tuesday, December 11, 2012 12:57 PM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Kurzweil K2600; keys not triggering

 

  

Anyone have experience with a Kurzweil K2600(s)? I have one that has a few
keys that do not trigger on/off. The synth will produce those sound
internally (via Midi) and the keyboard is sending out MIDI aftertouch on
those keys, but not on/off at any velocity. This started with one key, then
that key came back to life. Then it went out a week later, now 2-3 more
keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing
apart, I want to talk to someone who has pulled the hood off. I took apart a
couple old analog synths, but want to get some advice before opening this
beast. 

Any and all comments appreciated.

RE: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-12 by Lorne Hammond

It sure sounds like new strips are the cure to me.  lorne
Show quoted textHide quoted text
From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of Roger J
Sent: Tuesday, December 11, 2012 1:22 PM
To: vintagesynthrepair@yahoogroups.com
Subject: Re: [vintagesynthrepair] Kurzweil K2600; keys not triggering

 

  

Yes, very common failure on keyboards with rubber contacts.  You will either find debris under it or the contact is torn.  Replacement is always best and in the long run cheaper.  The contacts are FATAR and used on Korg(X5 for one), Rolands made in Italy, all Fatars and Studio Logics, Waldorf, Virus, M-audio(a Chinese copy), Nords, to name a few.  Cost $4 to 9 per group of 12 notes.  

 

It is also possible that you have a cable or circuit board problem, if you a group of 8 in a row or a fault every 8th key, you could have a circuit issue.  Random here and there without a math base of 8 is bad rubber contact or damage contact pad or crack at the pad or broken diode. 

  _____  

From: snowleopard <ppg223@...>
To: vintagesynthrepair@yahoogroups.com 
Sent: Tuesday, December 11, 2012 12:56 PM
Subject: [vintagesynthrepair] Kurzweil K2600; keys not triggering

 

  

Anyone have experience with a Kurzweil K2600(s)? I have one that has a few keys that do not trigger on/off. The synth will produce those sound internally (via Midi) and the keyboard is sending out MIDI aftertouch on those keys, but not on/off at any velocity. This started with one key, then that key came back to life. Then it went out a week later, now 2-3 more keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing apart, I want to talk to someone who has pulled the hood off. I took apart a couple old analog synths, but want to get some advice before opening this beast. 

Any and all comments appreciated.

RE: [vintagesynthrepair] Kurzweil K2600; keys not triggering

2012-12-12 by Brian

I've repaired/replaced hundreds of these contact strips over the years.  You
can try cleaning them.  Remove the rubber strips then clean the PCB and the
graphite pads on the rubber strips with methylated spirits.  This can work
wonders.  However, experience tells me that replacing the rubber contact
strips is the better way to go, BUT do clean the PCB as well, I always use
methylated spirits for this.

You can obtain these strips direct from the manufacturer in most cases,
Kurzweil, Yamaha and Roland are easy to get hold of.

Regards

Brian G3OYU
Show quoted textHide quoted text
From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of snowleopard
Sent: 11 December 2012 8:57
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Kurzweil K2600; keys not triggering

 

  

Anyone have experience with a Kurzweil K2600(s)? I have one that has a few
keys that do not trigger on/off. The synth will produce those sound
internally (via Midi) and the keyboard is sending out MIDI aftertouch on
those keys, but not on/off at any velocity. This started with one key, then
that key came back to life. Then it went out a week later, now 2-3 more
keys. I have a suspicion it's dirt/dust/grit, but before I rip the thing
apart, I want to talk to someone who has pulled the hood off. I took apart a
couple old analog synths, but want to get some advice before opening this
beast. 

Any and all comments appreciated.

Re: Kurzweil K2600; keys not triggering

2012-12-12 by snowleopard

Yes, the 72 key model. Definitely no liquid, though I do live in a fairly humid part of the country. I am guessing it's just age. I'll crack it open and give it a shot. Wish me luck...

--- In vintagesynthrepair@yahoogroups.com, John Henson <synthnerd@...> wrote:
Show quoted textHide quoted text
>
> Hi Snowleopard,
> I am assuming you are referring to the 72 key model.
> The aftertouch and key trigger systems are separate, so you can have one 
> without the other. It sounds like keyboard contacts all right.
> Could liquid of some sort have got in there? When a group of adjacent 
> notes stop working then this is a common cause. If they are scattered 
> about the keyboard, then it is time to strip and clean the whole contact 
> system, accumulated dust build up over the years will start to affect 
> more and more keys as time goes by.
> 
> Regards,
> John.
>

Re: [vintagesynthrepair] Re: Kurzweil K2600; keys not triggering

2012-12-12 by Roger J

76 keys. 

If you just remove the bender/mod cheek blocks 4 screws(smaller with large washer) , lift and unplug after-touch cable. and then all of the screws that go into the keybed assembly(flat headed into plastic screws), you can slide the the keybed up and forward, slip your hand under and disconnect the ribbon cables, then remove keybed without popping the button panel off.
R
Show quoted textHide quoted text
>________________________________
> From: snowleopard <ppg223@...>
>To: vintagesynthrepair@yahoogroups.com 
>Sent: Wednesday, December 12, 2012 1:08 PM
>Subject: [vintagesynthrepair] Re: Kurzweil K2600; keys not triggering
> 
>
>  
>Yes, the 72 key model. Definitely no liquid, though I do live in a fairly humid part of the country. I am guessing it's just age. I'll crack it open and give it a shot. Wish me luck...
>
>--- In vintagesynthrepair@yahoogroups.com, John Henson <synthnerd@...> wrote:
>>
>> Hi Snowleopard,
>> I am assuming you are referring to the 72 key model.
>> The aftertouch and key trigger systems are separate, so you can have one 
>> without the other. It sounds like keyboard contacts all right.
>> Could liquid of some sort have got in there? When a group of adjacent 
>> notes stop working then this is a common cause. If they are scattered 
>> about the keyboard, then it is time to strip and clean the whole contact 
>> system, accumulated dust build up over the years will start to affect 
>> more and more keys as time goes by.
>> 
>> Regards,
>> John.
>>
>
>
> 
>
>

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