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 Forum index » DIY Hardware and Software » Circuit Bending
help with mod on casio sk-5
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REV.F



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PostPosted: Tue Jun 02, 2009 11:13 am    Post subject: help with mod on casio sk-5
Subject description: mod circuit bending		 Reply with quote  Mark this post and the followings unread
Hello, I am looking for a how-to on a very specific mod on a Casio sk-5, namely to turn off the tremolo on the flute sound. That's it! any links or help would be very appreciated.
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ALEKSLEDROUG



Joined: Feb 11, 2010
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PostPosted: Thu Feb 11, 2010 5:05 am    Post subject:  Re: help with mod on casio sk-5
Subject description: mod circuit bending		 Reply with quote  Mark this post and the followings unread
hello... it's difficult to find photos of casio sk5 bended... i found pictures of sk1 but not for the sk5... anybody have information...?
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electri-fire



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PostPosted: Fri Feb 12, 2010 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread
I found a link to the service manual at http://www.casiosk1.com/ , might be useful.

Hrmpff... several attempts to download failed. If anyone succeeds, please post it as an attachment here.
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blue hell
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PostPosted: Fri Feb 12, 2010 9:49 am    Post subject: Reply with quote  Mark this post and the followings unread
Hmm .. the download works OK, but acrobat reader says the file is damaged beyond repair ...

edit: and when i try to interpret it with ghostscript i get errors too .. and when i make ghostscript try to rewrite it I end up with an empty PDF.
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also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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electri-fire



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PostPosted: Fri Feb 12, 2010 11:54 am    Post subject:
Subject description: Casio SK-5 service manual		 Reply with quote  Mark this post and the followings unread
http://manuals.fdiskc.com/flat/Casio%20SK-5%20Service%20Manual.pdf

My upload limit has been reached so no attachment (15.8M).

Edit: My upload limit has been raised, now the Casio SK-5 Service Manual is attached for "dead link prevention" .

Casio%20SK-5%20Service%20Manual.zip
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Download (listen)
 Filename:  Casio%20SK-5%20Service%20Manual.zip
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Last edited by electri-fire on Sat Feb 13, 2010 4:31 am; edited 1 time in total
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electri-fire



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PostPosted: Fri Feb 12, 2010 12:05 pm    Post subject:
Subject description: Casio Sk-5 vibrato off?		 Reply with quote  Mark this post and the followings unread
No mention of tremolo (vibrato?) in the service manual.

I've done some SK-1's, no SK-5's.

SK-5 CPU is MSM6283-05GS. SK-1 CPU is MSM6283-01GS. Some similarities in functions.

The SK-1 has a separate vibrato on/off function.
SK-5 has some unused functions at the key matrix. You might want to try those. YMMV.
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Sam_Zen



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PostPosted: Sat Feb 13, 2010 1:15 am    Post subject: Reply with quote  Mark this post and the followings unread
Do mind that tremolo is a variation in volume, while vibrato is a variation of frequency.
An interesting manual.
The percussion generator has its own clock frequency, apart from the CPU.
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electri-fire



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PostPosted: Sat Feb 13, 2010 4:16 am    Post subject: Reply with quote  Mark this post and the followings unread
Sam_Zen wrote:
Do mind that tremolo is a variation in volume, while vibrato is a variation of frequency.


Exactly, and the terms are frequently used in the wrong place. As the SK-1 has vibrato, I wonder, does the SK-5 use vibrato as well or actual tremolo?
In the latter case this might be implemented by the separate envelope signal sent from the CPU and could be overruled by adding a stationary voltage or smoothing capacitor there . I'm just guessing though.

Sam_Zen wrote:
The percussion generator has its own clock frequency, apart from the CPU.


Yes, I saw that. Cool. You could bend the percussion sounds independently from the synth/sampler sounds I suppose.
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electri-fire



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PostPosted: Sat Feb 13, 2010 5:04 am    Post subject: Re: help with mod on casio sk-5
Subject description: mod circuit bending		 Reply with quote  Mark this post and the followings unread
ALEKSLEDROUG wrote:
hello... it's difficult to find photos of casio sk5 bended... i found pictures of sk1 but not for the sk5... anybody have information...?


To show you the location of the ROM chips:
http://www.makezine.com/extras/33.html
The adress lines (see manual) are usually good and safe points.

Shot of the circuitboard in this video:
http://www.kyte.tv/ch/12114-dmitris-coa-video-blog/540923-circuit-bending-a-ca
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electri-fire



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PostPosted: Sat Feb 13, 2010 5:09 am    Post subject: Reply with quote  Mark this post and the followings unread
Sam_Zen wrote:
The percussion generator has its own clock frequency, apart from the CPU.


Demo of independent percussion pitchbend and other nice stuff posted by Mike October 29, 2008:
http://rhythmmemory.blogspot.com/
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ALEKSLEDROUG



Joined: Feb 11, 2010
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PostPosted: Sat Feb 13, 2010 5:31 am    Post subject: thanks Reply with quote  Mark this post and the followings unread
hello, thanks for the answer, Alien-Devices.com show pictures and sound too about the machine he bent...
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