Canon imageRunner C5051 Getting Started page 221

4
Turn OFF the main power of the machine, and then turn ON the main power again .
The [Remote UI] setting is made effective only after turning the machine's main power OFF, and then ON.
For information on how to turn ON and OFF the main power of the machine, see Chapter 1, "Before You Start Using This Machine."
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15-5
Before You Start the Remote UI