According to the schematics, J1 is cut for 240 volt.. I would pop it open, check JP1, if open, short it, and then run it at 120v. Make sure you put a label on the back to indicate its been converted to 120v.
https://github.com/nickpunt/nubus-se30/blob/master/Schematics/bomarc/Macintosh%20Classic%20Schematic%20(bomarc).pdf William Stillwell Board Member - Inspiration labs, Inc. a 501c3 organization Board Member & Co-Founder - Byte Amusement Group // Free Play Florida Arcade & Pinball Show a 501c3 organization On Tue, Jan 7, 2020 at 1:12 PM Thomas Pfaff <tpfaff...@gmail.com> wrote: > That machine has an analog supply board, apparently, in the case. > > Hard to say. If you're really really good with electronics and know how > to avoid being shocked off of unplugged electronics (CRTs+capacitors), you > may be able to take the analog supply board out and replace caps with US > values and get the board to output 110v. However, it will not be an easy > path. > > That's a lot of work to try and figure out the differences between the > US+foreign power supply boards + retrofit parts. > Not quite as hard, but still hard, would be to source a power supply board > for the US version, then replace that. > > > > Consider a 110V->220V AC power converter rated for the wattage required by > the Mac Classic. > I can understand... it's a cute little machine. > However, if you don't really know what you're doing you could receive a > fatal shock working around in that case. > > A random, separate note on capacitors: > BTW I find that pre-1990s capacitors generally do pretty well and don't > need replacing. Japan made high quality capacitors until their factories > closed down. > Once caps went chinese + se asian well... those are a different story. > Modern capacitors (the chinese ones at least) should be swapped out every > decade for anything you care about. Please disregard if you source your > capacitors, US made, from North Carolina. The audio freaks I know who > design/recap with those say they're really good quality. > > Thomas > > > On Sat, Jan 4, 2020 at 2:34 PM engrav <leng...@gmail.com> wrote: > >> Hi >> >> Have a 240v Mac Classic >> Is there any way to power it up with 120v in the US? >> Thank you >> >> Loren Engrav >> >> -- >> -- >> ----- >> 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 vintage-macs@googlegroups.com >> To leave this group, send email to >> vintage-macs+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/vintage-macs >> >> Support for older Macs: http://lowendmac.com/services/ >> --- >> You received this message because you are subscribed to the Google Groups >> "Vintage Macs" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to vintage-macs+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/vintage-macs/535765a0-5d23-4a13-9690-f90ac3672dc3%40googlegroups.com >> <https://groups.google.com/d/msgid/vintage-macs/535765a0-5d23-4a13-9690-f90ac3672dc3%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > -- > ----- > 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 vintage-macs@googlegroups.com > To leave this group, send email to > vintage-macs+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to vintage-macs+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/vintage-macs/CADqfMZLPLi45Gs8DW%2ByYPkJMOtbTd_nGWk4eHmrGPpt_7cqc7Q%40mail.gmail.com > <https://groups.google.com/d/msgid/vintage-macs/CADqfMZLPLi45Gs8DW%2ByYPkJMOtbTd_nGWk4eHmrGPpt_7cqc7Q%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- -- ----- 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 vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/vintage-macs/CADewWKWnEd9YQphWo%2BVyvjFufWtpF3EiuunwvODWAcSUK7XiJA%40mail.gmail.com.
