68kMLA Classic Interface
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| Click here to select a new forum. | | Classic II capacitor kits? | Posted by: robrsd on 2019-08-06 02:41:59
I have had a Mac Classic II for around a year that is in excellent physical condition. I started to work on replacing the capacitors (I have got so far as removing the primary culprits on the analog board) but my progress stopped when trying to order the replacement capacitors (for the analog and surface mount caps on the logic board). Looking on www.mouser.co.uk there are thousands of capacitors. I started to carefully piece together a shopping list to match the existing capacitors but if I make a mistake the outcome could be disastrous. So to my question, does anyone know of anyone who supplies replacement capacitor kits for classic mac restorations? I'm in the uk but am not in a rush so would be happy to order from abroad and wait for delivery.
Hope someone can help, my disemboweled mac sits in the corner of my office and looks a sorry state!
| Posted by: bibilit on 2019-08-06 03:52:41
Concerning the AB board, you will need:
1 - 1000µf - 10v - radial
1 - 1000µf - 16v - radial
1 - 1000µf - 35v - radial
2 - 2200µf - 10v - radial
1 - 2200µf - 35v - radial
And for the LB:
12 - 10µf - 16V - SMT
3 - 47µf - 16V - SMT
2 - 1µf - 50V -SMT
If you cannot found the exact match, you can go above those specs (you can replace a 1000 µf - 10 v with a 1000 µf -16 v for instance, even a 1200 µf - 16v ) never the other way round.
If you order a good brand, you cannot harm anything,the only problem is shorting the capacitor (connecting the negative side to the positive in the board)
The Analog side is straightforward, the LB side can be tricky if it's your first time.The Classic is pretty easy, the C II a bit more complicated.
| Posted by: robrsd on 2019-08-08 03:57:27
Excellent, thank you bibilit, much appreciated. I will rekindle and hopefully complete the project. Now to find the time!
| Posted by: robrsd on 2019-08-08 04:11:44
What brand would you recommend?
| Posted by: LaPorta on 2019-08-08 05:46:17
Panasonic is good, Nichicon as well. I have had good luck with Wurth surface mount caps. They are cheaper but usually have a good life rating. I used multiple of them in my Mac Portable without issue. I do not know of any disaster stories.
the other question is where they are used. Large power supply caps, as long as they are in spec, usually can not be too tightly regulated. However, on the logic board, look for those with tighter tolerances (e.g. low ESR, lower ripple current) as these are part of digital circuits which are far less tolerant of electrical “noise” than the pure AC-DC switching circuits of the power supplies.
| Posted by: robrsd on 2019-08-08 06:42:14
Perfect and comprehensive, thanks.
| Posted by: robrsd on 2019-08-19 01:12:01
I have finally placed my order of caps, after ordering I noticed some of the logic board caps are described as follows:
Aluminium Electrolytic Capacitors - SMD Aluminium Electrolytic Capacitors - SMD 16V 47uf 20% Audio-SMT
The Audio bit concerns me, will these be ok?
The Analog caps are all 'Aluminium Electrolytic, Radial Leaded' is this correct?
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