Path: utzoo!attcan!uunet!husc6!ncar!stout!cook From: cook@stout.ucar.edu (Forrest Cook) Newsgroups: sci.electronics Subject: Re: Mac II Monitor Problem Message-ID: <1047@ncar.ucar.edu> Date: 28 Nov 88 20:25:45 GMT References: <3825@ihlpe.ATT.COM> Sender: news@ncar.ucar.edu Reply-To: cook@stout.UCAR.EDU (Forrest Cook) Organization: Field Observing Facility, NCAR, Boulder, CO Lines: 29 In article <3825@ihlpe.ATT.COM> stuart@ihlpe.ATT.COM (S. D. Ericson) writes: >My Mac II monitor started acting very strangely lately. ... >Stu A good method for dealing with your high voltage arcing problem is to cover the leaky area with TV corona dope, availible from most tv repair parts suppliers, the Ratty old Shack might carry the stuff. Do the following: - Unplug the monitor. - Take a long flat screw driver and connect it to the chassis ground with a clip lead. Put the tip of the screwdriver under the suction cup on the side of the tube and discharge the tube. Wait a few seconds for the charge to build up and discharge the tube again. Be careful, >10Kv bites. - Pull the suction cup connector off of the crt, put the grounded clip on the exposed crt 2nd anode just in case. - clean the dust off of the area that is sparking, presumably somewhere on the flyback transformer or rectifier. - apply the corona dope around the leaky area and let it dry off. - put everything back together and hope for the best. - If there are any high voltage connections on the flyback that have sharp points, round them off with a file or solder. ^ Forrest Cook (The preceding comments were my Opinions) ^ /|\ /|\ /|\ {husc6 | rutgers | ames | gatech}!ncar!stout!cook /|\ /|\ {uunet | ucbvax | allegra | cbosgd}!nbires!ncar!stout!cook /|\