<div dir="ltr">Serious question, not being flippant - do you have the memory protect engaged? If I had one American dollar for every time I've gotten sidetracked by something dumb like that myself...</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Apr 30, 2022 at 7:31 PM al spitzley via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px"><div dir="ltr">Hello all,</div><div dir="ltr"><div>So I am working on a DOA OBxa. I've got it up and running after power supply rebuild and a lot of troubleshooting.<br>
Now I'm stumped with a couple of issues that could be related to each other.<br>
<br>
Firstly when I enable the cassette mode it doesn't seem to go into the
mode. The Cassette LED does light, but the other LEDS do not go out. The
Play button or seemingly any other button are non responsive.<br>
<br>
Secondly when I write a patch to load the patch I have to hold the
relevant Program button. As soon as I release the button the patch
disappears.<br>
Scoping the power rails shows a significant amount of noise. If I
disable the clock the noise goes. I've tried replacing numerous ICs
around the CPU, including rebuilding the clock but still there is a
bunch of noise. I'm hoping this noise is causing the issues I've
mentioned but am struggling to work out what is causing it. Or maybe
that is not the problem?<br>
<br><div>
Any ideas greatly appreciated. <br></div><div dir="ltr">Thank you!<br></div></div></div></div></div>_______________________________________________<br>
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