I acquired a Mac 128k/512k (it came with both logic boards) and a GCC HyperDrive 20 Mac 512k over the last few years ago. Since then, I've spent a lot of time examining the innards of these two classic beauties. Being an electronics hobbyist with an EE degree, I certainly enjoy tinkering. One thing I discovered is that electronic components, especially old electrolytic capacitors, are often in need of replacement to get the machine back in original working condition. I visited a variety of sources on the internet which offer parts listings of the original analog (power supply) board of classic Macs, and I also purchased an old copy of Larry Pina's excellent Macintosh Repair and Upgrade Secrets
book (ISBN 0-672-48452-8). (And for those of you who think Steve Jobs looks "frail" now, just have a look at the black and white photo of Pina on the back of his book!)
Using the information resources at my disposal, I began to compare the components listed with the actual components on each of my analog boards. I eventually purchased replacement analog boards off EBAY and subsequently compared those components as well. (I have uploaded 3 sets of analog board photos on Flickr
for your viewing pleasure.) I came across some errors and new information that was not listed anywhere else, so I decided to compile my own components listing, focusing on the most likely parts in need of replacement. You can view my Mac analog board components list here
. (Please don't overlook the fact that there are two sheets available for viewing, selectable at the bottom of this spreadsheet.)
I hope this serves to assist those of you interested in tinkering or otherwise repairing (or even upgrading) your existing Mac analog boards.