68kMLA Classic Interface

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Macintosh 128k recap question (noob)
Posted by: mloret on 2021-12-09 02:53:08
Hello! I recently purchased a nice looking Macintosh 128k—my first vintage Mac! It powered on but the puff of smoke and horrible smell told me that there is a RIFA cap that needs to be replaced. While I have it open, I was wondering if you guys could tell me what else Is typically replaced in these machines? Other caps? Thank you!7203F89B-164C-461F-910E-D8ED324C97BE.jpeg6747946C-05CC-442C-BBDC-8C847C32D9CB.jpeg5A36E174-9110-4465-803E-D0D9B551A8B2.jpeg
Posted by: LaPorta on 2021-12-09 03:01:02
Each and every electrolytic should be changed as well. C1 can also be exchanged for a film cap if you cannot find an electrolytic...and it may be more tolerant of heat as well.

By the way...welcome!!
Posted by: mloret on 2021-12-09 03:16:06
Thank you for the reply! How would I go about identifying these?
Posted by: mloret on 2021-12-09 09:20:04
It sounds like the electrolytics are the round ones. Do you guys know of a kit available?
Posted by: Johnnya101 on 2021-12-09 09:25:32
Here is an example of a kit for a 128k: https://console5.com/store/macintosh-128k-512k-plus-analog-pcb-cap-kit-630-0102-661-0462.html

Not sure if that's exactly what you need, I have never had a 128k, but it is a good start. Just look through the list in that link and see if it looks correct? That link is for the analog board only.
Posted by: LaPorta on 2021-12-09 09:59:43
If it is the US (and not international) model, I have a handwritten list of them all (minus the RIFAs) that I can scan and send to you.
Posted by: cheesestraws on 2021-12-09 10:06:21
That looks like a US one to me: international ones have four big purple caps towards the bottom right, not two.
Posted by: mloret on 2021-12-09 12:18:47
If it is the US (and not international) model, I have a handwritten list of them all (minus the RIFAs) that I can scan and send to you.
If you could send me that list, I would appreciate it. I am a noob trying to learn my way around. I will also need the RIFAs.
Posted by: LaPorta on 2021-12-09 13:51:09
I’ve yet to lose a RIFA, so I never replaced them…otherwise I’d list them!
Posted by: mloret on 2021-12-09 13:52:26
Do you know the best place I can find the rifa?
Posted by: cheesestraws on 2021-12-09 14:12:43
Any decent component supplier will have them. RIFA are owned by Kemet these days but are still distributed under the RIFA brand. I usually get mine from RS in the UK which is just my default supplier for general electronics.

There are suitable film capacitors these days too, but if you're not feeling adventurous, replacing like for like is the most sensible option.
Posted by: LaPorta on 2021-12-09 18:03:25
email address so I can send you the list?
Posted by: sfiera on 2021-12-09 18:29:55
JDW has an analog recapping guide video with a linked Mouser cart of capacitors. Based on his picture of capacitor locations, it’s for a US analog board. (Japan is international but 100V, so you see both kinds here)
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