I'm having some trouble with a battery change in a 3468 DMM. You would think I could handle that without incident! I kept 3 volts on the terminals while soldering in the new battery but one of the leads slipped off and there went the calibration. No problem - I can calibrate it again or so I thought. The display flashed "error 1" (ram error)and then went blank. It's been blank ever since despite all the resetting procedures I've tried. Could corrupt ram cause this? Or is could I have somehow damaged the controller? Any thoughts would be appreciated.