Crumar Performer: key not working well [solved]

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Crumar Performer: key not working well [solved]

Postby fh991586 » Tue Jun 07, 2011 4:18 am

Hi there!

I just got a Crumar Performer for a good price, even though it's definitely not in a pristine condition. Trying to clean it up a little, but I'm having a little problem with a key. Looks like it was banged up in the past, since there's a chip missing on it. The thing is that the contact isn't 100% each time. Depending on how you press it (hard, long, on the tip or higher), it's ok, intermittent, or not working at all. My guess is that the shock slightly messed up the little thing, but I'm not sure how I can try to unbend it a little. Is it safe? I really don't want to break it...

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If anybody can tell me how to fix this (possibly without removing more parts), I'd be grateful. Also, if anyone has the owner's manual, I'd like to have a copy too...
Last edited by fh991586 on Wed Apr 11, 2012 10:04 pm, edited 1 time in total.
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby rhino » Tue Jun 07, 2011 4:04 pm

Those springs are hard to straighten out without crushing them. My 2-cents: Go to SYNTAUR.com and see if they still have springs from an Ensoniq ESQ-1...they look like they COULD be made to fit. I may have one left if you need it.
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Re: Crumar Performer: key not working well

Postby Stab Frenzy » Tue Jun 07, 2011 4:18 pm

I wouldn't worry about replacing the spring at this stage, just spray it with a bit of faderlube/clean 'n' lube and play the key for five minutes and it should be much much better. If it still has issues after that then consider replacing it, I agree with rhino that the ESQ-1 springs look like they might fit.
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Re: Crumar Performer: key not working well

Postby fh991586 » Tue Jun 07, 2011 8:52 pm

I'm not even sure how to replace that without messing more things around! But I'll keep the possibility in mind.

The problem is when the key press down on the spring, it first shifts aside like a car transmission schematic* instead of simply going straight down. The delay while shifting explains the lack of (or uneven) sound, while it fully works when completely down. Although other pins aren't straight on this synth, all of them work as the should.

*For example, think about going from 1 to 4: http://image.shutterstock.com/display_p ... 311474.jpg
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby rhino » Tue Jun 07, 2011 9:36 pm

Try this at your own risk.
Get something like a large paperclip, straighten part of it out and bend an "L" on the end just a little longer than from the open (loose) end of the spring to the bent part. Hold the lower part of the spring still with fingertip, insert the bent end of the paperclip onto the spring (down inside the hole) and GENTLY see if you can bend the spring more straight. BE CAREFUL and try putting the key back each time for a test.
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Re: Crumar Performer: key not working well

Postby Stab Frenzy » Tue Jun 07, 2011 10:20 pm

fh991586 wrote:I'm not even sure how to replace that without messing more things around! But I'll keep the possibility in mind.

The problem is when the key press down on the spring, it first shifts aside like a car transmission schematic* instead of simply going straight down. The delay while shifting explains the lack of (or uneven) sound, while it fully works when completely down. Although other pins aren't straight on this synth, all of them work as the should.

*For example, think about going from 1 to 4: http://image.shutterstock.com/display_p ... 311474.jpg

Clean it like I said, that should help a lot.
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Re: Crumar Performer: key not working well

Postby fh991586 » Wed Jun 08, 2011 1:19 am

The paper clip looks like a great idea!

About the cleaning, I don't know what product to get (any specific brand you can recommend, considering I'm in Canada?), and I wouldn't know where to put it exactly. The bare minimum for now is that each individual key has to be cleaned to remove stains, and a good compressed air spray must be shot through the entire unit at least.

My main concern about this pin is that I don't even know what it's like underneath and how it is attached to something further away to produce the sound. And I don't feel safe removing more screws in that area since it's so close to some electronic board. Anyone went further to see the precise attachment, even if it's only within an Ensoniq? I don't know how that part is called precisely, so I don't know what to look for on the net.
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby rhino » Wed Jun 08, 2011 2:33 am

The coil-springs are probab;y soldered to metal eyelets on the circuit board. When you press a key, that spring is pressed against the gold-colored buss-bar that you see just beneth it. This makes the electrical contact that triggers the note.

I like CAIG DE-OXIT spray. Kind of expensive, but does a great job.

Part would be (likely) called a key contact spring.
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Re: Crumar Performer: key not working well

Postby fh991586 » Wed Jun 08, 2011 3:25 am

Thank you very much for all that information! I only took apart the keybed of a MicroKorg so far, so it's really not the same thing at all...

There should be a "Synth cleaning 101" thread somewhere as a sticky for all to see on this board...
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby fh991586 » Fri Jun 10, 2011 5:21 am

The buss-bar seems to be only one long piece, so it would be a great pain to remove it to adjust/resolder/substitute the spring. Incidently, the spring is too small to put something inside to straighten it (paper clip or safety pin won't do), and I'm pretty sure I'll break it if I try again to toss it with a pair of pliers (however smal they may be). The area is too narrow to work around it, and it's already overstretched...

In the meantime, I do prefer an imperfect contact on a key than no key at all. Thus the general cleaning of the unit continues!

Thanks for the help, but I don't have the skills & material to do better right now. Maybe I'll figure a way out later, while playing on or inside this keyboard.
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby fh991586 » Tue Jun 28, 2011 4:43 am

Good news! I was able to fix the problem for now, thanks to the tip from Rhino. It's not perfect, but it works.

The only metal part small enough to fit that I could find was too obvious: those damn things that come with every cables...
Image

The metal inside the plastic is very thin and easy to put in shape, but solid enough for the purpose intended. I could not put it inside the whole spring, because the two main parts where too much separated, but it help a lot to straighten one bit while I used a pair of pliers to give the whole thing a better shape. The area is really too narrow to work easily, but it finally went the good way!

This really helped me to understand how the synth worked. And since it needed a good clean-up, I didn't mind taking extra time playing in its guts (I'll post pictures in the appropriate section). Here's a look at the dust & stuff I had to remove (you can see the before & after on each):

Image
Image
Image

There's only some broken sliders to repair now, but it's really out of my league so I'll leave them that way. They're working, so it's good enough!
-Roland JX3P+PG200, D50+PG1000, Juno 6+106, MKS50/70, JP8080, U220, MVS1, MDC1, MSE1, RS09, TR-707
-Korg Poly61M, M1R, MicroKorg, Micro, Kaossilator/Pro, Monotron X3
-Yamaha DX7, TX816, TX81Z
-Crumar Performer, DSI Mopho, SCI Prophet 2002
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Re: Crumar Performer: key not working well

Postby rhino » Tue Jun 28, 2011 3:02 pm

GOOD WORK !!

Tiny fragile parts, cramped spaces, werid designs... these are all part of the wonderful world of VINTAGE SYNTHS !!!
"A thing may seem impossible...until it's done."
--Nelson Mandela
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Roland JD-800
Roland JX-10
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Ensoniq SQ-80
Korg DSS-1
Moog Mini
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