Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 Fluke 1/4/84; site fluke.UUCP Path: utzoo!watmath!clyde!floyd!harpo!decvax!ucbvax!ucbcad!tektronix!uw-beaver!ssc-vax!fluke!pwl From: pwl@fluke.UUCP (Paul Lutt) Newsgroups: net.micro.pc Subject: Re: Repairs Message-ID: <550@vax1.fluke.UUCP> Date: Mon, 19-Mar-84 10:59:40 EST Article-I.D.: vax1.550 Posted: Mon Mar 19 10:59:40 1984 Date-Received: Thu, 22-Mar-84 00:43:59 EST References: <17494@sri-arpa.UUCP> Organization: John Fluke Mfg. Co., Everett, WA Lines: 21 It has been suggested in this group that the IBM monitor could be repaired by any competent TV service type. While this is possibly true, it should be noted that the IBM monochrome monitor runs at 18 kilohertz, not the more usual 15,750 used in all normal NTSC compatible televisions. Replacing the IBM monitor's flyback transformer with one from a normal TV would most likely burn out the horizontal drive system. This is because flyback systems in CRT systems are highly tuned. Using a component designed for a different operating frequency from the one originally installed will unbalance this tuning, causing excessive power consumption and overstressing of drive components. The modern CRT is a marvel of design, but it must be kept in mind that just because the tube sitting on your computer LOOKS like a normal television doesn't mean that it is necessary the same. Find out what you have before you attempt to repair it. Paul Lutt John Fluke Mfg. Co., Inc. Everett, WA {uw-beaver,decvax!microsof,ucbvax!lbl-csam,allegra,ssc-vax}!fluke!pwl