Quoting a note from Tim Hughes from 4 years ago on T45 rebuilds
Chuck Norcutt
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Date: Sun, 5 Dec 2004 01:18:52 -0800 (PST)
From: Tim Hughes <timhughes@xxxxxxxx>
Subject: [OM] Re: T45 -- my solution
Here are the links to my schematic:
http://olympus.dementia.org/Hardware/PDFs/T45_Chrg_1_0.pdf
And Bruce's physical layout sketch.
http://olympus.dementia.org/Hardware/misc/T45_nicad.jpg
The reason your flash worked partly is that at least one of the strings
of cells, probably only has a single defective cell. This allows that
invertor to charge up the flash cap to a lower voltage where it can
still be triggered albeit with low light etc.
The cost to have the pack repaired is high because of tedious labour and
large number of cells. With care you can cut open the pack along the
seams with a dremel cut blade (best) or a fine point dremel diamond
coated bit or even with the tip of a fine soldering iron.
If you do, do it yourself you need to find a source of tabbed cells. You
need to replace all cells, as mixing old and new ones does not last
long. My favourite place to deal with is the NiCdLady in southern CA. If
you ask nicely they will usually do the tabs for free, even though they
list a small fee for tabbing. You still have to cut the tabs and solder
the cells together and fit it all in the small space. I would recommend
you do not use NiMh cells as the charger will damage them quickly.
An alternative to replacing the NiCd cells would be to use just two
Hawker Sealed Pb, D cells connected in series and hook them up to all
the + terminals in parallel. You would have to make some sort of adapter
connector. Although a pair of these D cells can fit inside the handle,
you would have to figure out how to hold them in. You would also have
to make a voltage regulated charger with a voltage of exactly 4.7V. So
this is only an option if you have electronics skills. One advantage is
the hawker cells are about $6 ea ($12 tot), so a bit cheaper, although
you will not get so many flashes out, You could make 2 or three packs
for the cost of a single set of NiCd's.
Beware of shorting the hawker cells they can deliver about 180A into a
short causing things to glow red hot.
Regards,
Tim Hughes
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Mark Dapoz wrote:
> On Mon, 8 Dec 2008, Ken Norton wrote:
>
>> 4. The shell of the battery is built in two halves, but are not separating.
>> This is where I am stuck. I've tried prying them apart but haven't "forced"
>> the issue too much yet. But I'm not getting anywhere.
>
> Yes, it's lightly glued along the edges. If you work slowly with a very
> sharp utility knife you can separate the two halves without damaging the
> case. A little bit of twisting of the pack also helps to break the bond.
> When done you'll need 20 AA's to rebuild it and a bit of time to put it
> all together. Get AA's with tabs welded 90 degrees to each other, it
> makes assembling the pack easier.
> -mark
>
>
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