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240 service manual

240 service manual

2005-02-12 by boardjunkie1

Got the manual today. Very good service info and nicely laid out. 
Pristine condition even. My 240 has an issue with the 
portamento/glissando, and looks like thats all done in 
software....bummer. I wanted to change it to constant time type 
glide, but unless I can find someone who can program in 8031 assembly 
that won't happen.

Something I have in mind is replacing the sub osc on each voice 
section with a CEM3394 since I have a Sequential board with some on 
it that I can rob. If that works out well I just may replace osc2 
with them too and be rid of the square only second osc.

When I get some time to fool with it I'll mod one voice and see how 
it works.

Re: [kawai_sx210] Re: 240 service manual

2005-02-14 by Travis Shire


Well, like I said I'm just bored with it. I've had it long enough to find out its strengths and weaknesses and to me the weaknesses outnumber the strengths. Most of the time it gets used as a midi controller for the NI pro53 and b4. So its nice to have a 61 key midi controller, but it just don't do all that much for me otherwise. Great filter(s), but the oscillators are a major weak point on this. Sure a second osc is nice, but square only definitely limits the possibility of too much variation of timbre. It does have potential however, and with the right additions I think it could be a monster. Hell, just making the sub osc a triangle wave instead of the square would open up different sounds. Like when you want a bright sounding patch with an octave down without the buzz of the square wave ruining it.

The reason the additional oscillators were square only is that its real easy to derive them direct from a digital source, thus you don't have to build an additional oscillator, just manipulate a logic signal. Good for the mfgr, bad for my ears.

I guess I could just sell it, but in reality the 8 SSM2044 filter ic's are worth more than I could get for it, so that makes no sense.

Interesting bit of useless knowledge trivia:

Did you know there was an arcade game machine that used a 6 voice analog synth for sound generation? Yep...the Bally Sente SAC1 system circa 1984. It was a similar concept to a Neo Geo where you had a motherboard and the software was interchangeable to create different games in the same cabinet, albiet one at a time. It used a sound generation pcb built by Sequential using 6 CEm3394s. Probably a Max or 6trak with a modified interface. A cheap source of parts for me (I was an arcade game repair technician for many years) since I have loads of this kinda stuff.





I personally wouldn't touch it.

;-)

I like them just as they are !




--- In kawai_sx210@yahoogroups.com, "boardjunkie1"
wrote:
>
> Got the manual today. Very good service info and nicely laid out.
> Pristine condition even. My 240 has an issue with the
> portamento/glissando, and looks like thats all done in
> software....bummer. I wanted to change it to constant time type
> glide, but unless I can find someone who can program in 8031 assembly
> that won't happen.
>
> Something I have in mind is replacing the sub osc on each voice
> section with a CEM3394 since I have a Sequential board with some on
> it that I can rob. If that works out well I just may replace osc2
> with them too and be rid of the square only second osc.
>
> When I get some time to fool with it I'll mod one voice and see how
> it works.





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Re: 240 service manual

2005-02-19 by texhand

--- In kawai_sx210@yahoogroups.com, "Travis Shire" <boardjunkie@t...>
wrote:
>You are losing me there. I am glad you got the manuals and the
sequencer to work. I get bored with anything, but then pick up
something else, then enjoy coming back. Don't get lost in the
technology. My sx240 does sounds that would roll Frank Z over.

Anyway good luck..

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