Vintage Simmons Drums (UK) Users Group

Hi,
this a rechargeable battery 3,3V for the RAM(IC48).I have the schematic from a friend, but there is not the detail of the battery.
Regards.
Yves
    Le jeudi 14 décembre 2017 à 14:45:53 UTC+1, Cristiano Dal Cin cdalcin@... [Simmons_Drums] <Simmons_Drums@yahoogroups.com> a écrit :  
 
     
Hi look info at simmonsmuseum web site ..

Inviato da iPhone
Il giorno 09 dic 2017, alle ore 17:48, sjgallos@... [Simmons_Drums] <Simmons_Drums@yahoogroups.com> ha scritto:


    
Can anyone tell me if the memory backup battery is a rechargeable battery or a primary cell?
I need to replace it and the old battery doesn't have any markings on it that indicate the type. I wouldn't want to put a lithium battery in there if the board will try to charge it. I used to have a schematic but after 2 moves, I can't locate it.
I know there are members that have schematics for the SDS9. I would be willing to buy a copy if anyone is interested.
Also, back in 2013 "philmurr" posted a message about replacing batteries and said that for his SDS9, he replaced the RAM with an NVM version from Dallas semi but didn't provide a part number. Has anyone else done this?

Thanks,
Steve