At 08:00 AM 4/16/05 -0700, you wrote: <<<schnitt>>> static discharge when working on your Mac. Likewise, don't go grabbing knownhigh voltage wires with your bare hands while the unit is still plugged into a wall. But we all know this, right?
Yes, but it slipped my mind once while repairing a monitor that didn't power up. I resoldered one of the mains connections that had come loose, plugged it in and it worked fine again. Proud of my achievement, I went about putting the case back on. Some wires that were too short restricted the reassembly, causing me to reach in with both hands to get things aligned properly. My hands promptly flew back out and had me cussing and swearing, as I had touched the mains connection WHILE THE UNIT WAS STILL PLUGGED IN! I was both angry and injured, from doing such a stupid thing, those sharp metal edges and the burn marks on my fingertips. The MacQuarium HowTo that states to discharge the CRT with one hand behind the back makes much sense in this example, even though it was mains current that jolted me. Another part to steer clear of when grounded are the pins on the solder side of those big, heatsink-mounted transistors. Well, not as bad as a friend of mine as a teenager who used his teeth to strip wires from a power cable that was still plugged in. He woke up a while later with a terrible headache. I still find it a wonder that he survived to tell the tale.
The one hand rule is an essential when working with high voltage. So are good work habits. I always try to touch the pins on the AC power connector of the unit. If I can touch them it's not plugged in. Another basic rule is to treat the unit as if it IS plugged in, even when it isn't.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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