VOGONS


Reply 240 of 244, by keropi

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TheGoose81 wrote on 2020-10-18, 12:57:
Hi, Is there any real reason to leave the battery installed if only using for Game Music? Thanks Mike […]
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Hi,
Is there any real reason to leave the battery installed if only using for Game Music?
Thanks
Mike

none at all, I have removed the batteries in my units ages ago...

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Reply 241 of 244, by edumoes

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Searching for "sc-55 battery", google shows this post.
And guess?. Yes, i've brought a SC-55 some days ago, same situation.
CR2032 full of white "acid killer". Just cleaned up a little of the holder/board with Vinegar / isopropilic alcohol.

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Reply 242 of 244, by bjwil1991

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You're very lucky, man. Good thing I changed the battery on the old SC-55 before I sold it.

Discord: https://discord.gg/U5dJw7x
Systems from C64 to FX-6300.

Reply 244 of 244, by Shreddoc

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blackmasked wrote on 2017-05-05, 17:48:
I own SC-55mkII and have had no issues with the battery. Instead I came across this when I opend it up recently. IMG_7747.JPG […]
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I own SC-55mkII and have had no issues with the battery. Instead I came across this when I opend it up recently.

IMG_7747.JPG

I cleaned it up as well as I could, replaced the cap and so far so good.

IMG_7749.JPG

Quality cap, but that didn't stop it from failing. 🙁

Dredging up this old issue again.

I found an identical situation inside my SC-55. But I further speculate, based on the evidence of certain scorch marks inside my unit, that this glue has actually combusted at some point in the unit's history. How dramatic, I know!! The scorch marks ("soot", or carbon residue) are present on the casing ceiling above the nearby heatsink region, and crucially, that black carbon residue are also present fully up one side of all 4 capacitors which are next to the heatsink.

The point being, soot does not occur merely by "gently warming up" a thing - actual combustion has to have occurred. The crusty, brown, bubbly (bubbly = it has boiled) nature of the residue at the capacitor base further supports that speculation.

Therefore I believe this is what happened, in sequence :
1. The heatsink heated up - perhaps in conjunction with heightened power draw scenario, and/or living in a hot country or room
2. This factory 'glue' has melted off from the adjacent capacitors, which are only millimetres from the heatsink
3. Gravity caused the melted glue to form a puddle at base of capacitor
4. Combination of heat, combustible glue fumes, and possibly even electrical short has ignited that puddle - likely a quick, 'split-second' flare up, there-then-gone.
5. Causing black scorch mark above heatsink on case, and black scorch marks up the sides of the capacitors, and leaving hardened, bubbly brown crust of burned glue at base of the capacitor.

This does not seem to have affected the unit's long term operation, though the capacitors' effective lifetimes were perhaps marginally reduced by the treatment.

Something to keep an eye out for, inside your units. For curiosity's sake, at least.

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