Epson DM-D500 Technical Reference Manual page 40

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The horizontal rotation mechanism of fixing plate A allows the display to be moved
freely for better visibility. The display can also be fixed to one of the following four
positions. Align the fixing plate A to the desired angle and secure the position using
the angle fixing screw.
The paper roll cover of the printer may not open if the position of the display is inappropriate. Before
securing the position of DM-D500, be sure to check that the paper roll cover of the printer can be
opened.
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Paper roll cover