Does anyone have any broken OM4T/Ti circuits that they
could donate to me? I would like to compare them with
the OM4 one's
--- Chris Charlton <c_charlton@xxxxxxxxx> wrote: > Hey
Dave,
>
> I've been thinking something similar, I have an OM4
> with a mechanical problem, and I have had the thing
> open to see if I can spot the fault, however I did
> notice a couple of things electronically. On the
> battery holder, there is a diode, quite a large size
> one, which presumeably stops any damage occuring
> from
> fitting the batteries in reverse. This looks (by its
> size) to be a bit of an overkill, and I'm sure it
> must
> swallow a couple of microamps in use, maybe it could
> be replaced with a low power one, or removed
> completely, assuming that you never put the
> batteries
> incorrectly!!
> Also I have noticed that under the top cover there
> is
> a regular sized transistor, I'm not sure what it
> controls exactly, but maybe it could be substituted
> with an equivalent low power version. I'm sure that
> transistors have moved on a little since the very
> early eighties when these components were chosen by
> Olympus.
> Another thing that could have a bearing on current
> drain is capacitors, they have a leakage which
> continually drains current, (they may degrade with
> age
> also) they could possibly be substituted with new
> high
> performance ones with an improvement on current
> drain.
>
> Please bear in mind that these are only ideas of
> mine,
> don't go hacking into your Oly if you are not sure
> about anything!!
> The best thing to do (I think) would be to compare
> the
> OM4T/Ti circuit with the OM4 one, I'm sure that most
> of the IC's are similar (apart from the ones
> associated with the full sync flash etc) it would be
> interesting to compare the other components apart
> from
> the IC's themselves to see if it would be possible
> to
> "upgrade" an old OM4 somewhat, alas I have 2 OM4's
> and
> no OM4T/Ti circuit with which to compare them, maybe
> someone out there in Olyland could give us some more
> information??? ANY TAKERS??
>
> Chris
>
>
>
>
> --- DBellamy2k@xxxxxxx wrote: > Dear list,
> >
> > Has anyone ever proposed any kind of retrofit to
> fix
> > the battery-devouring
> > properties of the OM2SP/3/4 ?
> >
> > I have my own 4 suggestions (which are probably
> > being proposed for the 1000th
> > time I know, but I am new to the list):
> >
> > 1. Make a new battery compartment cover with a bit
> > of insulating material
> > which can be slid across to disconnect the
> > batteries!
> > 2. Wire up an off switch to a position on the
> > exposure compensation dial
> > (tough if you want that minus 1 and two thirds
> > stops!)
> > 3. Wire up an off switch to the Auto/Manual switch
> > (but no room for another
> > position on the OM-2SP especially and maybe
> putting
> > another click stop on the
> > lever can't be physically done)
> > 4. (The one I like!): Wire up an off-switch to the
> > self-timer lever so that
> > pushing it to the left switches the entire camera
> > off, rather than just the
> > beeper.
> > Oh yes, and:
> > 5. (The one I like even more!): Wire up an
> > off-switch to the self-timer lever
> > so when you push it to the right it beeps for 20
> > seconds and then turns the
> > camera off. Great for that guy that buys the
> camera
> > from you and then goes to
> > take that all important shot of himself and his
> > mates outside the pub one
> > night!).
> >
> > Dave Bellamy.
> > http://hometown.aol.com/sitesearch/
> >
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> > mailto:owner-olympus@xxxxxxxxxxxxxxx >
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> >
>
>
>
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