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 Forum index » DIY Hardware and Software » Circuit Bending
disable autopower off on Casio SK 1, anyone?
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maxime



Joined: Jan 25, 2009
Posts: 7
Location: brussels

PostPosted: Sun Jan 25, 2009 12:54 pm    Post subject: disable autopower off on Casio SK 1, anyone? Reply with quote  Mark this post and the followings unread

hi you all,

It's my first post on electro-forum!!!

Do you know about a hack to disable the autopower off feature on the Casio SK 1 or SK 5? I tried to tie T5 to the ground unsuccessfully, the main chip seems to shut down after 8 minutes anyway, even when the general psu circuit stays active.

thanks

best

Maxime
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Sun Jan 25, 2009 1:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Welcome Maxime, not sure if it was the same keyboard but I remember some discussion about an auto shutdown feature somewhere here on the board ... IIRC it had to be solved by repeatedly simulating (using some electronics) some button press. Maybe search the forum for auto power off ...
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maxime



Joined: Jan 25, 2009
Posts: 7
Location: brussels

PostPosted: Mon Jan 26, 2009 3:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks for your reply blue hell!
damn, it seems like this feature isn't easily bendable!

best

maxime
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gmeredith



Joined: Jun 28, 2006
Posts: 82
Location: Tasmania, Australia
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PostPosted: Mon Jan 26, 2009 4:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Maxime,

The original site with the SK-1 auto power off disable is here:

http://www.electri-fire.com/sk1pagesoverview.htm

As for the SK5/SK8, they can't be disabled by this method - i've tried in vain over a long time. The reason is that the SK5/8 have a "smarter" processor than the SK-1 that, although you can do the same mod to them to disable it, will still fall asleep after the allocated 7 mins. The rest of the keyboard will be awake still if you do the mod to it, but it's useless without the processor awake to operate the keyboard.

The best workaround method for the SK5/8 is to activate a key or button every 6 or so mins - just before the APO shuts the keyboard off. This can be done automatically by using a simple 555 timer circuit and a tiny reed relay or something that is hooked up to a relatively unused button on the keyboard - such as the STOP button on the rhythm (this assumes you don't use the internal sequencer/rhythms - otherwise choose another button). The circuit "pings" the switch every 6 mins or so. This will keep the keyboard awake.

Cheers, Graham
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maxime



Joined: Jan 25, 2009
Posts: 7
Location: brussels

PostPosted: Tue Jan 27, 2009 2:31 am    Post subject: Reply with quote  Mark this post and the followings unread

HEllo Graham,
I will try your route on the sk1. the same circuit as sk5/8 is used on it. the keyboard shuts down at 8 minutes, even if the psu is kept awake..
the electri-fire mod doesn't work on my sk1, because of the smart processor also.
thanks a lot

Maxime
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gmeredith



Joined: Jun 28, 2006
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PostPosted: Wed Jan 28, 2009 4:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Maxime,

I found some more info on the apo bypass. I can't remember where it is from but I saved it as a web page to my computer ages ago for reference. I turned it into a pdf document for you (attached). It gives some info about getting it to work.

Cheers, Graham


SK1 APO bypass.pdf
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gmeredith



Joined: Jun 28, 2006
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PostPosted: Wed Jan 28, 2009 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is also the design for a simple "pinger" circuit to close a relay switch to attach to the SK5 (or SK1 if the APO bypass mod doesn't work). I haven't tried this circuit out, so it may need some tinkering with the resistor values to get the ping time to what you want.

Cheers, Graham


apo timer 5 min.JPG
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maxime



Joined: Jan 25, 2009
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PostPosted: Thu Feb 05, 2009 1:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello,
I used a 1 sec on/ 120 sec off 555 oscillator as in the schematics attached. Connected to a reed relay playing the "clear" key works like charm!
many thanks

Maxime


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gmeredith



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PostPosted: Thu Feb 05, 2009 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey, that's great news! Glad that circuit worked out - thanks for posting the 555 schematic.

Cheers, Graham
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Blue Hell
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PostPosted: Thu Feb 05, 2009 4:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

thumleft
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electri-fire



Joined: Jul 26, 2006
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PostPosted: Wed Sep 30, 2009 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

gmeredith wrote:
The original site with the SK-1 auto power off disable is here:

http://www.electri-fire.com/sk1pagesoverview.htm



Sorry for the dead link, I seem to have changed something at my site, so for those browsing the archives: Auto Power Off disable is here:

http://www.electri-fire.com/sk1autopoweroff.htm
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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Wed Sep 30, 2009 9:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, thanks a lot electri-fire ! Years ago I modded my sk1s a lot, but didn't find a solution for the dreadful APO.
Other than bridging the 'fill' button, because I almost never use the percussion.
Your site looks very interesting. I will check it out.

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electri-fire



Joined: Jul 26, 2006
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PostPosted: Thu Oct 01, 2009 10:28 am    Post subject: Reply with quote  Mark this post and the followings unread

gmeredith wrote:
I found some more info on the apo bypass. I can't remember where it is from but I saved it as a web page to my computer ages ago for reference. I turned it into a pdf document for you.


I updated the link for convenience.
The info was already in gmeredith's pdf. It started as a thread at the forum of sk1.org (Jesse "Tablebeast" Savage's sk1 related site, but this site is no longer available).
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v-un-v
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Joined: May 16, 2005
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Location: Birmingham, England, UK
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PostPosted: Thu Oct 01, 2009 12:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

wow! I used to be on the sk1 forum all those years back. Do you remember Freya?

Anyway, thanks electri-fire for such a great site. Shame the samples don't seem to do anything though.

A great mod on the VSS-30 (and 200?) is to starve it of voltage and amps (ie a dead battery). Some beautiful sounds can be created that way. Idea

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DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
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Lorenzo



Joined: Nov 09, 2008
Posts: 352
Location: Trieste - Italyjstan

PostPosted: Sun Oct 04, 2009 4:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks... for these links and mods!
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