Epson SQ-2550 User Manual page 190

3. If the outer case, printer cover or paper guide are dirty or
dusty, clean them with a soft, clean cloth dampened with
mild detergent dissolved in water. Keep the printer cover in
place to prevent water from getting inside the printer.
WARNING:
Never use alcohols or thinners to clean the printer;
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these chemicals can damage the components as well
as the case.
Be careful not to get water on the printer mechanism
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or electronic components.
Do not use a hard or abrasive brush.
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Do not spray the inside of the printer with
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lubricants; unsuitable oils can damage the
mechanism. Contact your EPSON dealer if you think
lubrication is needed.
Cleaning the Printer
Maintenance 6-3