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K-S2 Aperture block failure repaired Locked

Started Nov 6, 2017 | Discussions thread
This thread is locked.
flektogon
flektogon Veteran Member • Posts: 6,226
Re: K-S2 Aperture block failure repaired

DAVID MANZE wrote:

Firstly, well done!

Going back to my sound recording days, a build up of residual magnetisation was a common problem on audio tape recording heads, it caused a background grumble and other. It was routine to demagnetize the heads with an iron cored copper wound coil with an AC current which would "shake" the molecules around until their pole orientation was neutral.

From what I read here maybe the problem could also be cured by demagnetizing the offending core piece, it's a shame that many bodies find their way to the dumpster because of it!

Dave,

Actually that's an excellent idea, which could be even implemented by an addition to the camera F/W.  Just like dust removal, or other "maintenance" setting, there could be the "demagnetization" setting, where this solenoid would be driven by an AC current with a slowly decaying amplitude. Well, the lens probably would need to be removed during such procedure, but within a second or two the core would be completely free of any residual magnetism.

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Regards,
Peter

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