Onboard tuner won't turn off

[BREWSBAND]

Hello, I am the proud owner of an SE Angelus acoustc/electric single cutaway guitar and I am having an issue with the onboard tuner. I can switch it on, tune the guitar - no problem! But when I go to switch it back off it won't turn off. I have tried switching to a fresh 9-volt battery but still the same problem. In fact the only way I can get it to turn off is to remove the battery & clear the capacitor if it's charge. Any ideas?

 

[shinksma]

Wow, I seem to have passed by this sub-forum for a while.

Are you pressing and holding for about 2 or 3 seconds? That's how it turns off. Not just press and release quickly like you do to turn it on.