If my memory is accurate I believe the IC in question is a custom
chip produced for Olympus by Sharp. Probably one of those ultra low
profile jokers mounted directly to the flexible circuit and with a
dob of epoxy on top to really make it unfixable.
Someone, I think it was Michael Covington, once speculated that the
problem was internal to the IC in question. I am a bit hazy here but
I think it was said that a design flaw &or material ageing and
degradation might lead to a transistor failing and allowing a large
current to flow when it shouldn't.
Don't quote me, Im not an engineer and the exact details may be
incorrect but I am certain that the gist is correct.
Giles
Dr. Chris Barrett wrote:
> The question in my mind is: What is the most common fault with these boards?
> Are the custom chips
> failing, or some other, cheaper and readily available component? Could
> useable components be removed
> from old boards and remounted on new ones? Is it a hard board or a flexible
> circuit?
>
> I've also wondered about the merits of re-silvering old pentaprisms, which
> could be done if the old
> metal can be stripped and new coatings put on. Some one like Edmund
> Scientific may be able to recoat
> these.
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