Nice! Do you have a good place to get the tantalum caps?
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Doug McNutt Sent: Thursday, August 06, 2009 9:29 PM To: [email protected] Subject: RE: Another sound question, Mac SE/30 no speaker sound?? At 16:43 -0600 8/6/09, Sterling Jacobson wrote: >I'm ready to get my hands dirty with Cap replament on my macs. > >How do I get started with this? > Get thee to tantalum replacement capacitors. Anything that looks like an aluminum cylinder with two terminals is suspect For the audio problem I believe C6 is the culprit. It is a 1 microfarad 50 volt unit that's smaller than all of the rest. It's just forward of the serial ports on the back There isn't any 50 volts anywhere on the board so a replacement needs to be 1 microfarad but any voltage greater than 12 should be good enough. With some magnification and some good lighting you can often see an area around a capacitor that looks funny. Perhaps you can't quite see the traces under the green solder mask or perhaps an area reflects a bit differently. That's acid leaking from those aluminum electrolytic capacitors that work because the acid reacts with aluminum to produce a thin insulating layer of Al2O3 which IS the capacitor dielectric. Someday I'll take some pictures of the operation. I use a small pair of wire cutting pliers to cut the caps in half and then solder wick and a small iron to remove the remaining leads fro the board. Replacing with tantalums is easy. just figure a way to hold them in place as with a small clamp and flow solder over the contacts. Wash the leaked acid off first. Hot water gets the acid. A rinse in dry alcohol gets rid of the water but distilled water rinse followed by a lot of drying time will do the same thing. -- --> From the U S of A, the only socialist country that refuses to admit it. <-- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.45/2285 - Release Date: 08/06/09 05:57:00 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to 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 unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
