Re: DX7 Memory Corruption

"[email protected] [YamahaDX]" <[email protected]>
Newsgroups gmane.music.equipment.yamaha-dx
Message-ID <[email protected]> 
Dan, 

 A diode essentially stops current flowing in one direction, as you know. So in this case (I haven't looked at the circuit diagrams) its probably as you said, to stop main power flowing back into the battery and trying to charge it, which would be very bad. A shorted diode would act as a jumper. Very bad. An open diode would stop battery voltage from getting to the RAM, meaning contents lost after power-off.
 Those 3V batteries last a long time because the amount of current needed to keep the contents of the RAM is very very small.
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