Yes, very important. Pretest all your cells before assembly to be sure
they will all take a charge.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
Chuck Norcutt wrote:
> Quoting a note from Tim Hughes from 4 years ago on T45 rebuilds
>
> Chuck Norcutt
> -----------------------------------------------------------
> 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
> ---------------------------------------------------------
>
> 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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