Can't turn TM off (due to past use of scheduling editor?)

Question

Long ago (several 'cats' in the past) I changed the once-an-hour schedule of Time Machine. It think I used a program called Time Machine Scheduler, which I no longerhave and cannot find. 
Ever since, Time Machine refuses to stop. The Preferences setting for On-Off is ignored, and TM is always On. 
It seems there some setting, somewhere, that has not been reset, even through multiple OS updates. It's driving me crazy that every time I take my MB Pro away from the desk, I get Time Machine error messages even when I've turned it off.
Clearly, there's a setting somewhere that was changed, and that has survived muliple OS updates.
Since the current tool for this purpose seems to be Time Machine Editor, I installed it and then de-installed it, hoping that that might restore the settign to its default. No such luck.
Does anyone have a solution?  I've seen several Terminal commands for changing the TM schedule but they seem to evolve as the OS changes. I don't want to try an outdated Terminal command and make things worse.
Is there a way -- through Terminal or otherwise -- to restore the TM defaults so that the Preferences On-Off setting will be respected?

Answer 1

Is this what you used?
http://www.klieme.com/TimeMachineScheduler.html
If that's it, you could try installing it again and using the "uninstall" button. But I'm hesitant to recommend that.
The description on that web page makes sense in places, and doesn't make sense in others. I think the author wasn't quite sure what he was doing, and didn't fully understand the implications. It sounds like he adds a second set of files for controlling Time Machine, overriding the Apple ones - and that's why nothing you do works, since everything else just changes the Apple settings.
Before using that software again, try looking in a couple of places to see if you can find the extra files that the software added:
Use "Go -> Go to Folder" as mende1 suggested, but type "/Library/LaunchDaemons" and look for something that has TimeMachineScheduler in the name, or something similar. Do not delete it (yet). If nothing is there, try "/System/Library/LaunchDaemons" (this is a folder that you're never supposed to touch, ever, but I suspect this software does). Again, look for a file with a name that suggests it came from this software.
If you find a file, and you're sure that it's from this software, then "copy" it (the old command-c, or "Edit->copy"). Open up terminal, and type this command and paste the file into the end of it before you hit "return" (it will just fill in the full path to the file):
sudo launchctl unload -w
After you paste, the full command will look more like this (but probably not this exactly, because I'm just guessing):
sudo launchctl unload -w /Library/LaunchDaemons/com.klieme.TimeMachineScheduler.plist
Hit the return key, you'll need to type your password (invisibly) and hit return again. Hopefully not much happens - if you see any kind of message it means something went wrong. This command tells your mac to stop loading this preference list file, and the "-w" makes it permanent.
For good measure, restart your mac. If the problem goes away, then you can go ahead and delete the file. And hopefully Time Machine keeps working - it's possible that this software also disabled Time Machine in order to override it, but that's solveable too. And it's highly likely that the regular Time Machine preferences will start working at this point.