Hello everyone, I have a problem with my DE-5000. I am able to turn it on by wiggling the battery but I am unable to do so if I press the power button, however the meter turns off if I press the same button when the meter is at "on" state. Do you know what kind of problem it is? Any response (or a DE-5000 schematics from any kind soul who wants to share it) is very appreciated, thx.