Roland Texart XT-640 - 3 About the Symbols

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3. About the Symbols
The meanings of the symbols used in this document are as follows.
This symbol indicates instructions that must be followed in relation to op-
eration. Always follow these instructions to prevent accidents and damage
due to misoperation.
This symbol indicates things that must be checked visually in relation to
operation. Always perform a visual check to prevent accidents and damage
due to failure to check.