This switch has double supervisor engines.
I tried commands
no power enable module x and
hw-module module x shutdown
for test the second supervisor, but it doesn't work.
How can i test?
Are you using CatOS by any chance? From Cisco Catalyst-6500's power management page Use of the CLI to Power Modules Up or Down You can issue one of these commands in order to power down a properly working module from the command-line interface (CLI):
Catalyst OS (CatOS)—
set module power down module_number
Cisco IOS® Software—
no power enable module slot