Canon MX490 Series Online Manual page 202

The setting is enabled after this. If you want to disable this function, select Disable from the list
according to the same procedure.
Important
• In the following cases, you can set Auto Power Off but the power will not be turned off automatically.
• When you use the printer by connecting it to a network
• When you use the printer by connecting it to a telephone line via a modular cable
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