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Finally Purchased an Original Macintosh 128k for $300
- Thread starter zastin17
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That's possibly an open-ended question, with too many answers 
To be clear, some of these components may cost you considerable $$$. You also must be confident in replacing them correctly and making good solder joints. This applies to anybody reading or using this post as a guide.
Be careful looking at notes online with respect to board reference numbers since there are actually two different basic boards out there. One is 110 volt AC and the other is "International" - the latter is changeable from 120v to 240 (NOT Automatically). The International version is usually found configured for 220/240V AC.
I can tell you that there are a few semiconductors that Apple upgraded (likely due to reliability issues). Some, you'll find a reference for (in US only 120V AC boards) at this URL:
http://retromaccast.ning.com/profiles/blogs/compact-mac-analog-board
(It's a link to a "Mac analog board components list")
A further reference with 120V and International board references here:
http://myoldmac.net/cgi-data/forum/phpBB2/viewtopic.php?p=722
There's also 4 pin Yoke connectors with longer thru-hole pins for a more reliable solder join.
There are two chokes at the top of the board. These were replaced by red-colored Litz Wire types (instead of single stranded copper colored) which do not run as hot and should not cook/melt the Horizontal Width coil's plastic former.
EG:
The Class X & Y suppression capacitors are finally blowing up these days - when you consider what these components do, it's no wonder. WARNING: You really must replace these with the correct Class of capacitor - they are a safety device and if replaced with incorrect Class of capacitor, could certainly fail early and could cause an electrical shock under certain failure conditions.
The problem is, nobody knows what component is the next weakest - that may become clear over the next decade (if at all).
If you're planning on running it a lot, then since electrolytic caps are rated in thousand of hours, those could be an on-going replacement hassle well into the distant future.
To be clear, some of these components may cost you considerable $$$. You also must be confident in replacing them correctly and making good solder joints. This applies to anybody reading or using this post as a guide.
Be careful looking at notes online with respect to board reference numbers since there are actually two different basic boards out there. One is 110 volt AC and the other is "International" - the latter is changeable from 120v to 240 (NOT Automatically). The International version is usually found configured for 220/240V AC.
I can tell you that there are a few semiconductors that Apple upgraded (likely due to reliability issues). Some, you'll find a reference for (in US only 120V AC boards) at this URL:
http://retromaccast.ning.com/profiles/blogs/compact-mac-analog-board
(It's a link to a "Mac analog board components list")
A further reference with 120V and International board references here:
http://myoldmac.net/cgi-data/forum/phpBB2/viewtopic.php?p=722
There's also 4 pin Yoke connectors with longer thru-hole pins for a more reliable solder join.
There are two chokes at the top of the board. These were replaced by red-colored Litz Wire types (instead of single stranded copper colored) which do not run as hot and should not cook/melt the Horizontal Width coil's plastic former.
EG:
The Class X & Y suppression capacitors are finally blowing up these days - when you consider what these components do, it's no wonder. WARNING: You really must replace these with the correct Class of capacitor - they are a safety device and if replaced with incorrect Class of capacitor, could certainly fail early and could cause an electrical shock under certain failure conditions.
The problem is, nobody knows what component is the next weakest - that may become clear over the next decade (if at all).
If you're planning on running it a lot, then since electrolytic caps are rated in thousand of hours, those could be an on-going replacement hassle well into the distant future.