Jeff Blakeney wrote:
To: Michael Black Michael Black wrote:The highest voltage is on what looks like a suction cup on the side of the picture tube. Shorting that to ground will get rid of the worst,take a needle, solder a good piece of wire to it, tape the needle to a dry stick, with the other end of the wire going to the chassis of the monitor. Slip the needle under the "suction cup" (it really isn't it's just a rubber disk that well covers the actual high voltage contacts that insert into a well in the picture tube). If you're lucky, there should be a spark (I say lucky since it proves that you've properly made contactwith the contacts underneath, but if there's no spark, it could meanthe voltage has already dissipated, or that you didn't make proper contact).You might want to add that the monitor should be plugged in to make sure the ground prong of the power cord, which is connected to the chassis of the monitor, is actually connected to ground. Otherwise, you might not discharge anything and might even add a charge to the chassis. Once it is discharged you can unplug the monitor.
Actually, this is not so. The only potential difference that matters is between the anode of the CRT and the chassis ground (which is what you will be referenced to as you work on or about the monitor). Earth ground is irrelevant. You need to discharge the capacitance of the CRT, not discharge any charge relative to the planet earth. ;-) -michael NadaNet and AppleCrate II: parallel computing for Apple II computers! Home page: http://home.comcast.net/~mjmahon "The wastebasket is our most important design tool--and it's seriously underused."