simmonssds7fan skrev 2013-05-22 01:53:
> Alright then.....let me run the issue by you then and see what you think
> it is.
>
> When you power it up, it initializes normally. Then the low tom circuit
> trigger led comes on and sound is faintly generated, sounds like a
> constant "doom-doom-doom", then it slowly stops. After the low tom stops
> any one of the other toms or snare will trigger randomly at full volume
> until they are all triggering at the same time, generating a buzz/white
> noise. The bass channel never does this, only the snare/rim, and the
> toms. The unit gets rather warm when it does this. If you shut it off
> and let it sit until it gets back to room temperature, it goes back to
> near normal and the cycle repeats. I have changed the OS chip to the 3.0
> version, it did have the 4.0 version, but it only slightly helped.
>
> Any ideas which mux/demux chip I should start with? I'm thinking the low
> tom, but I don't understand if it starts with that one and it goes off,
> how it could influence the others to randomly trigger like that.
> Wouldn't that mean they all have issues?
This may sound rudimentary, but have you checked the power lines? Any
fluctuations? Since it's running so hot that seems like the best bet...
Are the proms OK (thinking mainly the tom prom here)? As I understand
it, there's no noise on the bass drum channel, hence it being silent
when the snare/rim is going haywire. So that sounds reasonable.
Do the bass channel work? I mean, can you trigger it and tweak it while
the other are actin g crazy?
--
electronically yours, jesper
- -- --- ---- ----- ---- --- -- -
www.electronic-obsession.se