Canon EOS 250D Advanced User's Manual page 306

Adjust movie sound volume with the TV set. The sound volume cannot be
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adjusted with the camera.
Before connecting or disconnecting the cable between the camera and TV
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set, turn off the camera and TV set.
Depending on the TV set, part of the image displayed may be cut off.
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Do not connect any other device's output to the camera's <D>
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terminal. Doing so may cause a malfunction.
Certain TV sets may not display the images due to incompatibility.
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