Apple iie motherboard recapped

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Tomswork
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Joined: Fri Nov 22, 2019 10:05 pm

Apple iie motherboard recapped

Post by Tomswork »

I recapped my apple 2e because I was having random reboots memory errors that changed every test and poor picture quality the capacitors had bulged and leaked some black goo.

Here are pictures of the recapped areas

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Tomswork
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Joined: Fri Nov 22, 2019 10:05 pm

Re: Apple iie motherboard recapped

Post by Tomswork »

The capacitors in question are 10uf 16v axial electrolytic

I replaced them with 10uf 15v tantalum axial
And the 2e runs like new

Tom

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stephen_usher
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Re: Apple iie motherboard recapped

Post by stephen_usher »

Oh, you should really have given those tantalums a lot of voltage headroom. The semi-official advice from manufacturers is to use a voltage rating 1.5x that of an electrolytic in the same position as tantalums can't handle the spike current as well and will be damaged by short lived over voltage.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Tomswork
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Joined: Fri Nov 22, 2019 10:05 pm

Re: Apple iie motherboard recapped

Post by Tomswork »

Kemet does make a 10uf 20v tantalum axial at about 4 dollars each. While I have the 15v ones in my kit for free

Tom
Tomswork
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Re: Apple iie motherboard recapped

Post by Tomswork »

Back together and working

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Tom
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rubber_jonnie
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Re: Apple iie motherboard recapped

Post by rubber_jonnie »

Looking at my IIe, it seems to have similar caps to those you've fitted, though it doesn't look like re-work.

Nice Job.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
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