IBM 5280 User's Setup Procedures page 140

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90. You have completed the system checkout procedure for your
IBM 5280 Distributed Data System.
Place the verification diskette and blank diskette 20 (if used) in their
protective envelopes and insert them in the holders provided in the IBM
binder containing the IBM 5280 Machine Verification Manual. Place the
magnetic stripe reader test card (if used) in the same holder with the
verification diskette. If you have a communications adapter on your
system, go to Section 9 of this manual. If you do not plan to use the
system for any other programs, set the Power switches of all machines in
your system to 0 (OFF).