Spectrum 2 ceramic disc rot ?

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supaduper
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Spectrum 2 ceramic disc rot ?

Post by supaduper »

I do not really buy hardware these days but could not pass up this mint Spectrum +2 which hardly has any hours on it, just replaced the tape drive belts and it is working perfectly, but I noticed on the motherboard that every 100nf ceramic disc has some sort of white rot on them with a few actually having some cracks, I will replace them but has anyone seen anything like this ?

Sinclair Spectrum2_100nfcaps.jpg
Sinclair Spectrum2_100nfcaps.jpg (204.05 KiB) Viewed 293 times
Sinclair Spectrum2.jpg
Sinclair Spectrum2.jpg (217.57 KiB) Viewed 293 times
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exxos
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Re: Spectrum 2 ceramic disc rot ?

Post by exxos »

Maybe dust accumulation over time sticking to the tackiness of them ? does it wipe off ?
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supaduper
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Re: Spectrum 2 ceramic disc rot ?

Post by supaduper »

No bud they are stained that way, tried isoprop but did nothing, just wondered if it was an aging thing. and some are lightly fractured so also thought it may be a heat stress thing, but surely they do not get hot.and notice the stain is in the same place on all of them
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Re: Spectrum 2 ceramic disc rot ?

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Could be stress I guess. A few seem to have similar "circles" of white on them. If some are cracked as well..
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Re: Spectrum 2 ceramic disc rot ?

Post by exxos »

There is this post https://superuser.com/questions/1155953 ... -capacitor
The white powder is a sign of previous component failure from internal partial short circuit , over heating oozing out of molten ceramic binder, followed by slow cooling down after fusing open the internal partial shorts to allow the crystals to grow.

The external white crystals on ceramic discs are made from aluminum oxide, aluminum nitride, magnesium oxide, and silicon dioxide.

A sign of poor quality ceramic caps.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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supaduper
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Re: Spectrum 2 ceramic disc rot ?

Post by supaduper »

Thanks bud, looks like cheap poor quality Ceramic discs , who'd have thunk it from a Mr Sugar product :lol:
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