[sdiy] Odd MKS-70 Behaviour....

[Rainer Buchty]

> Every time I shut the machine down, the MIDI parameters get scrambled.
> For example, the control channel becomes 1X (literally what the machine
> reads!!), and I get similarly odd results on both the individual A and B
> channels. While I CAN go through this little routine upon startup
> forever and ever, I am generally concerned that this might signal a
> bigger problem on the horizon.
>
> So far, the only things I can think of are:
>
> 1. The backup battery is on the way out;
> 2. Bad RAM chip;
> 3. Partially scrambled software.

No idea about the MKS70, but with the ESQ-1 it would be either the battery
slowly phasing out *or* spikes coming from the PSU. That was an issue with
earlier ESQ-1 models where you indeed could garble up the battery-buffered
RAM by flicking the power switch a couple of times.

Later models just came with a simple filter installed, i.e. the power
cables were looped through a ferrite ring.

So you might want to check the power lines with a scope.

Rainer