Canon iR2020 Series User Manual page 37

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Be careful not to drop any foreign objects, such as paper clips or staples,
inside the machine. If a foreign object comes into contact with electrical
parts inside the machine, it might cause a short circuit and result in a fire
or an electrical shock.
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If there is unusual noise or smoke, immediately turn the main power switch
OFF, then call your service representative. Using the machine in this state
might cause a fire or an electric shock. Also, avoid placing objects around
the plug so that the machine can be unplugged whenever necessary.
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Do not turn the main power switch OFF or open the front cover during
operation of the machine. This might result in paper jams.
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Do not use highly flammable sprays, such as spray glue, as it may catch
fire.
1-8 About the Installation Location and Handling