Hi Tom, Roger
Thanks for the response(s) and yes, that is exactly the tag/wire I was worried about. A bit of tinned copper has been duly applied and all is running well. I can see that will be a (probably significantly?) lower impedance than the >6 inch long drooly single crimp ground connection that it parallels!
The current drawn from the bench supply was about 240mA prior to the last failure and now sits happily at ~160mA and the 25V rail seems more stable too so I suspect that the recently failed Q6552 (feedback loop transistor) was on the way out as a result of whatever unpleasantness occurred to cause the battery negative wire insulation to go all cracked and crinkled.
Roger, I'll have a poke around the stripline tomorrow and let you know what I see in the way of grounding.
Thanks again,
Adrian
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On 8/6/2018 9:49 PM, Tom Gardner wrote:
If you mean right by the three coloured connectors mounted on the rear of the PSU board, then there should be a 1cm bare single core wire from the chassis' tag to the 0V PCB trace on those connectors.
