Vintage Simmons Drums (UK) Users Group

First off you need to remove the lithium battery. Standard lithium batteries are not designed to be recharged. (Unless they are a lithium ion and they need a different method of recharging). You are lucky the battery has not exploded and set fire to the SDS!! You can remove a couple of diodes that are in the recharging circuit of the SDS7 and it would be ok to fit a standard lithium 3.0-3.6v battery so if you want to use the lithium battery you have fitted you must do this. 

--- In Simmons_Drums@yahoogroups.com, vout@... wrote:
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> I just switched on my SDS7 and found all the memories scrambled. This has happened before and I have a note of (some) of the settings but I have lost a lot of good sounds. The problem is this is a fully maxed out SDS7 (it usually has 10-12 cards installed) so there are a lot of settings to write down and it is very tedious to reprogram.
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> The memory battery is good - I replaced the ni-cad pack with a Lithium battery a few months ago and the voltage is over 3v
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> This seems to be a common problem with the SDS7 - can any of the Simmons gurus here explain why this happens and is there a permanent fix for it? I thought it might have something to do with the backplane connectors, but the battery is connected directly to the memory chips so I don't see how a bad connection could affect it.
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> On a related note - does anyone have an external ram-pack for sale? this could be a long term solution. Or would it be possible to clone the ram pack with modern non-volatile memory, that would be a good project (or even replace the internal memory card with something more reliable).
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> Any thoughts appreciated.
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> Cheers, vout
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