Re: Dead DX7 Mark I - Repair questions -- Help!

@aerobaticant - Are you saying that you think the diode may be the reason why it's losing the voltage upon power-down?

 

After a ton of troubleshooting, I've determined that if I power it up, and I wait for the LED digit to change to "01" (maybe 4-5 seconds?), I can shut it off and turn it on again a second time - and then I won't get the "RAM is Corrupt!" error message from E! -- but of course I've lost all the settings all over again. 

 So I'm thinking that the RAM may actually be fine, but somehow the first power-up doesn't have enough voltage to get started...and the second power-up then has enough voltage to get things to get rolling...but by then either the backup battery isn't applying enough voltage in there to keep everything stored in RAM - or it's losing the current elsewhere. BTW, the backup battery voltage appeared to be about 4.5V if I remember (as measured by E!), and the CR2032 battery was 3.5V. 
 

 So I am wondering if the E! board may be fine, but the drop in voltage is screwing up E! with strange results upon rebooting. Again, yesterday afternoon I got everything working...but a half-hour later it was as if someone had pulled the battery and I was back to square one.
 

 Thanks!