I'm in a discussion with a user who doesn't seem to have access to the schematic tool. Is there a "reputation threshold" for access to this tool? If so, can we get rid of them?
It looks like there is, although it doesn't appear to be documented anywhere. If you view the site logged out (as an unregistered user) the schematic button doesn't appear on the question or answer form, so at the very least unregistered users can't.
I'm guessing (although haven't tested) that the level is 11 rep, because this was the original threshold on the Electronics site (which got schematics first). Since then, the threshold has been removed there—but apparently it remains here.
If you take a look at Electronics as an unregistered user, the schematic button does appear, so it looks like it should be possible to have it changed if desired.