128K Analog Board & Logic Board Capacitor List

[Elemenoh]

I'm in the process of doing a full recap on a 128K Mac and was having a hard time finding a complete list. So I made my own. This is for the 120V version part number 630-0102. The physical sizes might be off by a part of a mm, but replacements will mostly be smaller anyway.

Notes​

• If you need the 240V version, check out this post.
• 33uf 25V is a bit cheaper than 16V, so I plan to replace all with 25V.
• The typical C38 replacement (PME271M610MR30) was out of stock at Digikey in February 2022. I ended up ordering PME271M610MR04. I haven't been able to identify the difference yet. Hopefully it'll be fine.

@Mac84 FYI since you commented about this on my IG post.

	Location(s)	Capacitance	Voltage	Temp Rating	Package	~Diameter (mm)	~Height (mm)	~Lead Spacing
Analog Board	C1	3.9uF (replace with film type)	250	105º	Radial	33x16.5	27	7.5
	C2	4,700uF	16	85º	Radial	18	37.5	8
	C3, C30	220uF	16	105º	Radial	10.5	18	6
	C5	47uF	10	85º	Axial	6.5	14	N/A
	C6; C14	22uF	50	85º	Axial	6.5	16	N/A
	C9	10uF	160	85º	Radial	10	16	N/A
	C11	33uF	25	85º	Axial	6	12	N/A
	C13	33uF	16	85º	Axial	6.5	13	N/A
	C24; C29	2,200uF	10	105º	Radial	16	31	7
	C25; C26; C31	1,000uF	16	105º	Radial	16	25	7.5
	C35; C36	100uF	200	85º	Radial	18	33	7.5
	C38	0.1uF X (Replace with X2)	275	110º	Radial	23x6.5	14	20.3
	C39; C43	470uF	10	85º	Radial	10	15	5
Logic Board	C5; C20	33uF	16	85º	Axial	5	12.5	N/A
	C22	4.7uF	35	85º	Axial	5	12.5	N/A

 

[AndyDiags]

Your list seem to be missing C14, as well as the two safety capacitors C33 & C37. One important number you're missing is the lead spacing,.
JDW did a great video on recapping this board a couple years ago. I highly recommend you watch it if you haven't.
He also provides a link to a Mouser cart in the description which has all the required parts listed.
Lastly, JDW also has this Google Docs Spreadsheet which has details on each part.

 

[Elemenoh]

Good catch. I've added in C14. It's a 22uF 50V axial like C6. I did not include C33 or C37 (Ceramic disc caps) since I've never seen those fail and AFAIK are not common to replace prophylactically. I can add them in here as optional if others think it's a good idea.

Edit: @JDW are you recommending replacing the filter disc caps since they might fail short?

 

[Kai Robinson]

Would you mind adding this to the resources section, too?

Many Thanks, Kai

 

[Elemenoh]

@Kai Robinson Will do. I'm going to measure all the lead spacings when I do the recap itself. Once I have all of those measurements, I'll add the updated sheet to Resources.

 

[Mac84]

Excellent work!

I’m curious, is your Analog Board marked as “1983” or “1983-1984”. I have one of each so it would be interesting to note if there are any differences. Thanks again for your contributions!

 

[Elemenoh]

It says "1983-84"

 

[Elemenoh]

@AndyDiags I've added Lead Spacing above.

Also, for anyone curious, here are all the caps as measured in this specific Mac 128K. Quite impressive that only one cap is wildly out of spec.

 

[Elemenoh]

@Kai Robinson I've added this as a resource here.

 

[Elemenoh]

Just for completeness, I noted the OEMs for each capacitor on this specific board in case that's interesting to anyone. I've noted 'Nippon Chemi-con' as marked, but I think they're now known as United Chemi-con.