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sfiera

What’s this C1?

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I’ve been reading up about how to care for my new Plus, and one of the things that comes up is the capacitors, particularly C1. So I opened it up and found this surprise:

 

26J6dVaSx_t42yqX1KJ-Abv3RbGp1NfimWtpp_nKEup6cwWtFvLVqvFajDoQms_lvHx29H3ZtTTcp9sjm9gtDQp8JH50tKEjcHOoIqvULOZYhxIVqNNzTd4dLCPW4P3dS0bry4TrsOHVBfCm_P19lqDWvwR9gKE8pXAo7zxsa8OrkrR7DcjpH5Y298aB2S2BM1JJ7fcxEZo24TMysBJOwEKCqLQVFySyTsYoOI02_fShLA5hb5uAuLZaIyiMmZn4Sytip8VNMB8BZ1WSAXMNqoScS3NbrSc6ts_1wDP_9Agq37nlWqPzWqI8ET6vhx-2EhmDp5T3EwCRQfHauScX3agIFsj0W5of4cfkitvNAf2XLvw8hsuRuKACP8CTcM_RE6TaFJFMn5SzTXO13_-LT-RIYGs8KMSV5hk08WlXrs7_gcvB_tE5tY93xThyWUkwW6tHVm7RFw5j3PFIc9rOVI974153E5NshrmuPmspB_pPVgK0RdO-8O8QmwDCMqmseMDN4lPfx5WTntEmV8h6edUy2h1EwYintkB6-cq_rKbOFD10Wa1sEb4BG8_2ixoUKxEQ5JTXMbhJfB2vgVQbsRh841yPIYfiodBbX9IdZyl04HKJr_iRYjdJss24Otf6XSYz8pp863igzTeFKaq2EQ6TMazW9o_WDEEFoJt1tSO1ZKrH_Xr1aM-0=w1152-h864-noQ0rTs4Prq8YXY6WLlKZgF-ONf3MTfFa1oBqrFYs6oqxMxzNCz-LQ71tb-PUe5-VjGCfZfcLJBemgWlxu-_0qrpSLn5N5phMP9TjFLpOI1yIU8Blvwo4k0oXXGBI0hd9_y4GmESCAaIvY1fQ1k6Bz27DBL7J4HuBvOvqXw_VRgWrALfLbktxrP4QobxEHrtaYeiSzWIXC_uIQo4chhRD_WuLUmkaC_bto9rEbWCRgQBDQsTtvdb_rBMq71cgGxD7a2WYbtPm0XAzJi8jg1WQ0E-A0tenpyDPieM5TvR7-dibGJB-IOOXMAbVGEnBu-7n2WXvkWv07ej_Oqo2LyPY9nLjXuUq_e1L5SXg9o9Jm5IoarFu_0pWv9hHxQlYTwGkpnb9bfUbF3wNQar0UE9At6LkzA434fS580vXplA4tg2ruzwG07EqA8Mvg7EEyjeqGPGsx4wFpWtmRdOHsBUXsvpShwqyKOQs8O7Uu7s-lCqOKbY7akZqjKcwENip2mTP08MX_qtLmPZaXCVjumxbg6ug9fYtVZiZ5PzTKLJaVaAmH5N1_7m4M88l62-Z1DumSb7vPybJmY-CKQwt8Nt80AeaiikB91T7NJ9DykEjB-pB8JMHU6kWyjrd5MCzUdvs-mFYQHFhMInWu58EH98SWc3QQFZ-xHv1cHVqJ5dzynKt6dlssPk25NKro=w928-h1236-no

 

I think it’s probably original, given all the hot glue around it, but it doesn’t match the images I’ve seen online. Is it a better capacitor for the job? I’m not really sure what to make of it. The other capacitors look alright to me, so I’m not in a hurry to replace them.

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It is either original or a replacement...I had one in a Mac Plus of mine, and couldn't tell whether or not it was original. I replaced it with a large 3.9(?)µf film capacitor as per specs and it works fine.

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It's stock, just a later axial version.

Look for a date code on it. Usually it's year/work week or vice versa.

Here's another like yours.

 

Edited by MOS8_030

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A date code on the capacitor or on the computer? The capacitor appears to say 92/47, but Nov. 1992 would be too late for a stock capacitor in a Mac Plus, wouldn’t it? I’m not sure where to look for a date code or serial number for the computer. Normally, I’d look on the case, but this Plus was transplanted into a 512k shell at some point before I got it.

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4 hours ago, sfiera said:

A date code on the capacitor or on the computer? The capacitor appears to say 92/47, but Nov. 1992 would be too late for a stock capacitor in a Mac Plus, wouldn’t it? I’m not sure where to look for a date code or serial number for the computer. Normally, I’d look on the case, but this Plus was transplanted into a 512k shell at some point before I got it.

That's probably the correct date. Check the dates on some of the other caps.

If your system isn't original then there's no telling when that board was installed.

Certainly Apple provided replacement parts for Plus's for several years after they officially stopped production.

They may have still been selling Plus upgrade kits in '92, I don't know.

(Apple also supplied re-worked boards as warranty/repair replacements.)

If you pull the board completely out and check the soldering on the back you can usually tell if the board has been re-worked.

There may also be a date penciled on the motherboard there next to the Apple Computer name. It would be the same format. (that white square to the left in your photo.)

Edited by MOS8_030

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Someone could've done their own repair on it in 1992, or as @MOS8_030 says it could've been Apple repaired.

 

Apple tended to support machines for a lot longer back then, so they would've still been repairing Pluses in the early 90s I think.

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