[stevehertz]

And don't forget - and I'm not trying to frighten you - when working on a 'live' piece of electrical equipment, you are dealing with potentially lethal voltages. Be very careful at all times. The biggest mistake I have made in the past when working on a 'bare' chassis is to switch it off using its on/off switch, but leaving it still connected to the mains. At some point you come back to the chassis, start fiddling with it and inevitably, at some point you touch the mains.. It hurts and it can kill. Moral to the story, don't use the on/off switch when working on a bare chassis, always unplug it from the mains. In fact in those circumstances ie working on a bare chassis, it's best to leave the on/off switch 'on', so you will see by way of scale lamps etc that it is on. Otherwise, as I say, pull the mains plug.