The Kawai & Teisco Analog Synths Group

In defence of the notorious Ni-Cd 3.6v 50mah (see Photos) I would like
to say that I purchased my SX-210 back in 1982 and I have only
recently replaced the Memory Battery due to leakage; that's 23 years
not bad going in my estimation. But it has to be acknowledged it can
cause damage to the circuit board if left unchecked; I was fortunate I
only had superficial damage easily put right with a little help from
group member's advice.
Unfortunately I too was unsuccessful in finding the details in the old
group records on how to convert to Lithium with a blocking Diode (to
prevent charging?)(Why prevent charging?) Or did I miss read it! in
the end I settled (with great success)on a replacement Nick Metal
Hydride Memory Backup Battery 3.6v 80mah available from
http://www.rapidelectronics.co.uk/ Order Code: - 18-1625 .£2.05p plus
P&P & VAT.  This site also has a range of jack plugs and sockets etc
including right angled plugs which I found particularly useful; they
have no minimum charge only postage.
Another site in America has the Ni-Cd 3.6v 60mah @ $5.95 but
operates a minimum order charge of $50, Plus Carriage.
http://partsexpress.com/ Part No: -141-102. Hope you find this
information useful; Regards, Clive. 08.02.06.

To replace the battery type with Lithium you should block the 
charger, otherwise the battery would explode (it is not rechargable).

To do that, replace the battery with a coin cell 3v lithium one,
while placing a a 1N4148 diode with the positive side of the diode 
facing the positive side of the battery, connected to the 1,5K 
resistor on its other side.

I've done that on a few instruments including my SX210 and so far it 
works fine.



--- In kawai_sx210@yahoogroups.com, "faisanvideo" <faisan@...> wrote:
>
> In defence of the notorious Ni-Cd 3.6v 50mah (see Photos) I would 
like
> to say that I purchased my SX-210 back in 1982 and I have only
> recently replaced the Memory Battery due to leakage; that's 23 years
> not bad going in my estimation. But it has to be acknowledged it can
> cause damage to the circuit board if left unchecked; I was 
fortunate I
> only had superficial damage easily put right with a little help from
> group member's advice.
> Unfortunately I too was unsuccessful in finding the details in the 
old
> group records on how to convert to Lithium with a blocking Diode (to
> prevent charging?)(Why prevent charging?) Or did I miss read it! in
> the end I settled (with great success)on a replacement Nick Metal
> Hydride Memory Backup Battery 3.6v 80mah available from
> http://www.rapidelectronics.co.uk/ Order Code: - 18-1625 .£2.05p 
plus

> P&P & VAT.  This site also has a range of jack plugs and sockets etc
> including right angled plugs which I found particularly useful; they
> have no minimum charge only postage.
> Another site in America has the Ni-Cd 3.6v 60mah @ $5.95 but
> operates a minimum order charge of $50, Plus Carriage.
> http://partsexpress.com/ Part No: -141-102. Hope you find this
> information useful; Regards, Clive. 08.02.06.
>

Was the NiMH battery specified for memory backup useage? Last I knew the NiMH didn t perform well in standby applications. Maybe a special type has been

--- In kawai_sx210@yahoogroups.com, "Travis Shire" <boardjunkie@...>
wrote:
>
> Was the NiMH battery specified for memory backup useage? Last I knew the
> NiMH didn't perform well in standby applications. Maybe a special type
> has been developed, I dunno. I'd still opt for the lithium tho......
> 
> Dear Travis, Yes it is a Memory Backup, check out the spec on
http://www.rapidelectronics.co.uk/ Order Code: - 18-1625. Regards,
Clive.16.02.06

> 
>   ----- Original Message -----
>   From: faisanvideo
>   To: kawai_sx210@yahoogroups.com
>   Subject: [kawai_sx210] Corrected Spelling
>   Date: Wed, 08 Feb 2006 12:47:58 -0000
> 
>   In defence of the notorious Ni-Cd 3.6v 50mah (see Photos) I would
>   like
>   to say that I purchased my SX-210 back in 1982 and I have only
>   recently replaced the Memory Battery due to leakage; that's 23 years
>   not bad going in my estimation. But it has to be acknowledged it can
>   cause damage to the circuit board if left unchecked; I was fortunate
>   I
>   only had superficial damage easily put right with a little help from
>   group member's advice.
>   Unfortunately I too was unsuccessful in finding the details in the
>   old
>   group records on how to convert to Lithium with a blocking Diode (to
>   prevent charging?)(Why prevent charging?) Or did I miss read it! in
>   the end I settled (with great success)on a replacement Nick Metal
>   Hydride Memory Backup Battery 3.6v 80mah available from
>   http://www.rapidelectronics.co.uk/ Order Code: - 18-1625 .£2.05p plus
>   P&P & VAT.  This site also has a range of jack plugs and sockets etc
>   including right angled plugs which I found particularly useful; they
>   have no minimum charge only postage.
>   Another site in America has the Ni-Cd 3.6v 60mah @ $5.95 but
>   operates a minimum order charge of $50, Plus Carriage.
>   http://partsexpress.com/ Part No: -141-102. Hope you find this
>   information useful; Regards, Clive. 08.02.06.
> 
> 
> 
> 
> 
> 
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