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<P>This is one for the oldies (I may be wrong) who played with micros 30 years ago. </P>
<P class=western>I have a CNC mill which forms most of my income. It's old but very useful and accurate. It uses a 2 x 6809 processors to do the work. </P>
<P class=western>Several years ago, the control occasionally freezed when the large compressor started. I say freezes but sometimes it just displays rubbish. A switch off and on restores the controls. </P>
<P class=western><BR><BR></P>
<P class=western>I swapped the large single phase compressor for a 3 phase one and the problem went away. </P>
<P class=western><BR><BR></P>
<P class=western>Then about 18 month ago, I found that whenever I welded with a high frequency start, again the display would, at times, freezes. It's gradually getting worse and I'm getting worried. I loose my set-up each time it freezes. I added ferrite beads to some of the interconnecting cables and changed the PSU caps (someone else recommendation) but hasn’t really made much difference. </P>
<P class=western><BR><BR></P>
<P class=western>Is it an earthing issue, or do filter caps near the processors get old, or a any other component past its sell by date ? </P>
<P class=western><BR><BR></P>
<P class=western>If you think you can help, I'd be happy to trade machining time for fault finding time or similar.</P>
<P class=western><BR><BR></P>
<P class=western>Thanks Wallace</P>
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