[sdiy] Oberheim Matrix 6 ---- 3.6v Lithium battery replacement.. or not ?

[John Speth]

Regarding soldering, I've faced that problem in the past. I've had good 
luck with preparing a battery by soldering red/black pigtails to the 
battery, wrapping it in heat shrink tubing, then soldering the pigtails 
to the board after snipping (no heat) the old battery out. Then figure 
out some way to anchor the battery (tie-wraps, etc) if necessary. It 
also makes it easier to replace the battery again 30 years later :)

I think the key when working on old fragile boards is to take every 
precaution to avoid heating the board due to soldering. The pigtails 
provide a measure of soldering heat isolation. Soldering the wires to 
the battery requires a hot iron and flux.

JJS

On 8/7/2022 7:33 AM, Jean-Pierre Desrochers wrote:
>
> Hi all,
>
> A friend of mine brought me a working Oberheim Matrix 6 keyboard
> that he was worried about the inner memory lithium battery (BR2032)
> being about to die.. and to replace it.
>
> Well after a quick check the battery was still in pretty good physical 
> condition (no leakage)
>
>
> and was showing a strong 3.23v on its terminal (AC unconnected)
>
> So.. In this situation I’m wondering if this lithium cell should be 
> replaced or not.
> I know this keyboard is at least 30-40 years old and many of the coin
> batteries of these vintage keyboards need to be replaced, but..
> And on replacement I thought about soldering a coin battery socket
> on the PCB pads BUT the battery placement on the PCB
> is very close to some IC’s as shown on the picture and
> would need the socket to be raised a little to avoid these IC’s.. I 
> don’t like that.
> I could also buy a coin battery with PCB legs too like this one
> but again, replacement or not ?
>
> I don’t know the year of manufacture of this Matrix but here are
> the serial number and BIOS number.
>
> SN: 7622661
>
> BIOS: M6R 2.13
>
> Your opinions are very welcomed.
> Cheers !
> Jean-Pierre
>
>
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