Don\'t know about the 6000, but the Cxx0 series you can shutdown by sliding the battery switch to \"unlock\", hold down Fn+Home and lide the switch back to \"lock\", keep holding the Fn+Home keys and in a sec or so the unit powers down - also useful for those times when the Z locks up.
Sharp also recommends this way to shutdown prior to flashing, but I usually just reboot while holding the \"Ok\" key
Stu