rhaar@rcsac1.UUCP (Bob Haar CS50) (03/26/90)
In article <1990Mar25.144511.10154@uhura.neoucom.EDU> wtm@uhura.neoucom.EDU (Bill Mayhew) writes: > .... > >"Monitor switched on?", you ask. I installed a power switch on my >monitor. I don't like the idea of leaving the CRT running while I >am not at home. > .... > >Do not attempt to install a switch on your monitor with your >computer plugged in or switched on. Do not install a switch if you >do not have reasonable electronic credentials. > How about posting a short "how-to" note. I would like to install a switch like this, but don't know which wire(s) to splice into. Also, is it possible to remove the monitor from the main case and extend the cable? are there any special shielding concerns? I would appreciate hearing from anyone who has attempted these mods. thanks in advance, Bob Haar, GM Research Labs
gst@gnosys.svle.ma.us (Gary S. Trujillo) (04/08/90)
In article <22656@rcsac1.UUCP> rhaar@rcsac1.UUCP (Bob Haar CS50) writes: > > How about posting a short "how-to" note. I would like to install a > switch like this, but don't know which wire(s) to splice into. ------------------------------------------------------------------------------- From the archives... (I've deleted all but the relevant sections. Apologies to Bill.) | From: wtm@neoucom.UUCP (Bill Mayhew) | Newsgroups: comp.sys.att | Subject: Re: 3b1 Terminal & Scrreching Noise | Summary: Usually not just the flyback is bad | Keywords: Flyback transformer replacement? | Message-ID: <1837@neoucom.UUCP> | Date: 23 Nov 89 04:30:53 GMT | References: <1246@adds.newyork.NCR.COM> | Sender: wfd@neoucom.UUCP | Organization: Northeastern Ohio Universities College of Medicine | | ... | | With monitors' penchant to fail in ugly ways, I opted to install a | a separate power switch on the 12 volt power lead feeding the | monitor on my 3b1 at home. I soldered a wire to the fuse and | another wire to the fuse holder and put a piece of tape between the | fuse and its holder. A switch is then attached to the free ends of | the wires. As such, the switch can be used to shut off power to | the monitor while I'm not at home. I drilled a 3/8" hole on the | right bottom of the case for the shaft of a small Raido Shack | toggle switch's handle. On my monitor, there was plenty of room to | install the switch. Note that it is important that you put tape | under only one end of the fuse when installing the switch so that | the switch is wired IN SERIES with the switch so that you have | continued fire protection. Of course, if you are going to work on | the monitor, unplug the machine from the wall and leave it off for | 30 minutes before opening the case. This is necessary to assure | that any residual high voltage dissipates; even then, you should | still presume that high voltage charge may remain. Never work on | anything electronic alone. Have someone present to call for | assistance if you are subjected to electrical shock. One more | safety issue is the display tube. Hitting the tube may cause it to | crack and subsequently impode. Very serious injury can be caused | by the flying glass of the implosion. I have seen a CRT implode; | it is VERY ugly. You don't want to be in the same room if it | happens. | | If you have the type of monitor without the fuse holder, you'll | need to splice into the power lead itself if you want to install a | switch. | | ... -- Gary S. Trujillo gst@gnosys.svle.ma.us Somerville, Massachusetts {wjh12,spdcc,ima,cdp}!gnosys!gst