Hi, You can swap the Flyback transformers between Compact Macs ranging from an 128K to a Classic. Eventhough the part numbers are different, the flyback transformers can be exchanged.
I would even recommand to use a flyback from a Mac SE or higher to repair an 128K/512K/Plus since these flybacks have bleeder resisitors inside. Not all flybacks on a Mac Plus analog board have bleeder resistors: it depends on the brand so best is to go for one from a Mac SE or Classic. Always discharge the flyback transformer before handling the part as the bleeder resistors inisde the flyback can fail ! The tube is also the same for all Compact Macs 128K -> Classic. There are different brands, like with the flybacks, but you can exchange them without any problem. Just when swapping the tube keep the coil that's on it: don't swap this part with one of another brand or things can get ugly... Good Luck, Nico -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens PeterH Verzonden: dinsdag 25 mei 2010 20:17 Aan: [email protected] Onderwerp: Re: Mac Plus flyback transformer? On May 25, 2010, at 10:13 AM, Rodolfo Gil wrote: > I have an experience with bad flyback transformer in Mac Plus. > Flyback transformers have different ways to fail. In my case, there > wasn't high voltage on the CRT but I could hear the start up chime > and activity in the FDD (loading OS). I took away the fly back > transformer from a Mac 512K analog board (same part number). This > model of flyback is discontinued. There are (or were) a great many different models of (horizontal sweep) flyback transformer. (The PSU also uses a flyback transformer, so there are really two of them on a 120K, ..., Plus analog board). The early non-bleeder-type sweep flybacks are no longer available. Good thing, too, as these can be dangerous. Since at least with the Plus, if not earlier with the 512K, all sweep flybacks have been of the bleeder type. -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
