[chbot] 6809 Processors

Marshland Engineering marshland at marshland.co.nz
Sun Feb 2 19:40:14 GMT 2014

This is one for the oldies (I may be wrong) who played with micros 30 years ago. 
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. 
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. 

I swapped the large single phase compressor for a 3 phase one and the problem went away. 

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. 

Is it an earthing issue, or do filter caps near the processors get old, or a any other component past its sell by date ? 

If you think you can help, I'd 
be happy to trade machining time for fault finding time or similar.

Thanks Wallace
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