I should note that there is a S-R latch circuit on the mothernboard that controls the soft power switch. Part of this circuit is a couple of electrolytic caps. There were schematics available online for this section of the motherboard for the IIci, not sure about an actual II.
On Fri, Dec 13, 2013 at 2:16 PM, Geoffrey Oltmans <oltma...@gmail.com>wrote: > Changing out the capacitors can certainly affect this. Mine wouldn't power > up without it. I didn't replace every single one on my IIci board, but it > wouldn't start without the ones that I did. > > Of course, now it won't start if it's really cold. The room that it is in > in our house isn't heated, so I have to set a little space heater next to > the thing and give it a few minutes to warm up physically before it will > power on. :) I guess I'll have to get after it again. > > Have you tried pulling the PRAM battery? > > > > On Fri, Dec 13, 2013 at 12:57 PM, John-Robert La Porta < > johnrlapo...@gmail.com> wrote: > >> Hey everyone, >> >> Went to get an image of the ROM of my Mac II, and it's been in my >> parent's closet of 10+ years. When I hook it up, not a thing will happen: >> nothing turns on. I know that it has a soft power switch and all, but i >> tried the keyboard with another mac and everything worked properly. Since >> it is a soft switch that works through the motherboard, I am not sure if >> the issue is with the power supply or the board itself. I've seen a lot of >> people talk about capacitor replacement here, not sure if that would have >> anything to do with this. I did check the two fuzes in the power supply, >> and they also appear intact. Any suggestions? >> >> As a note, the last time I used it, I noticed that the sound output was >> very low, leading me to believe that it may be a capacitor issue. >> >> -John >> >> -- >> -- >> ----- >> 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. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- -- ----- 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. For more options, visit https://groups.google.com/groups/opt_out.
