SK-1 problem...

[the_zombiest]

I'm having issues with an SK1.
It turns on fine. and for your first 434 keystrokes it functions as you might expect.
Then, the keys stop responding.
The rhythms still play, and the keyboard seems to reset after pressing the demo button or some of the different voice selections.
I just don't know what the problem could be, so any help would be massively appreciated.

I've posted this conundrum on the SK-5/8 yahoo group also.

Again, any help would be superb.

[Gordonjcp]

You counted 434 keystrokes? :-O

[Gleix]

You counted 434 keystrokes? :-O

I can't help out with the problem, but I upped his karma for having that kind of patience 

[the_zombiest]

You counted 434 keystrokes? :-O

I did...
I needed to know

[Circuitbenders]

thats suspiciously specific. Its 434 keystrokes every time?

Maybe every SK1 does that but nobodies ever actually played one for that long

[the_zombiest]

I only counted once and it's probably more likely between 400 - 450 keystrokes... I suck at concentrating.
I'll count again for the sake of science 
Basically, mashing the keys constantly for 2 minutes will cutoff the keyboard sounds and leave the playing rhythm intact.
It's not a massive problem, just annoying.

[gmeredith]

You mention posting this on the SK forum - did you mention there that your SK had the power cutoff bypass mod from Electrifire's site? If so, try reversing the mod and get it back to stock condition and see if it restores the playing.

Cheers, Graham

PS good luck with the Phat Philter Bank!

[the_zombiest]

The keystroke issue is resolved, kind of...
I had the sk1 on record instead of play.
d'oi   

've reinstalled the PPB and it's still gotta lot of hum. still not tried it on batteries yet though, so that might cut some of the crap.

Thanks again to Graham and Noystoise for the help.

[noystoise]

thats funn, i was just going to ask you if the record mode was stuck on. i was looking at the service manual and it says is records around 400 steps

[gmeredith]

Ha! It kind of makes you feel empathy for numbskulls who call computer support lines and the tech asks "have you plugged it in and switched it on" and the tech ends up being right.

I suspect most of the hum with the PPB is with running the SK off an AC adapter - I didn't design the PPB with any mains filtering in the supply rails, because I intended it to be battery powered. I didn't think about the fact that users still might use the AC adapter to power the SK, and so get any supply ripple through to the PPB. I may have to add a largish electrolytic capacitor across its power input rails (500uF or bigger) and see if it fixes it, if all other aspects fail to improve it.

Cheers, graham