Sennheiser Rack-mount Receivers EM 2050 - Manual (Page 34)

Cleaning the receiver
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Cleaning the receiver
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Before cleaning, disconnect the receiver from the mains.
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Use a cloth to clean the receiver from time to time.
CAUTION! Liquids can damage the electronics of the receiver!
Liquids entering the housing of the device can cause a short-circuit and damage the
electronics.
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Keep all liquids away from the receiver.
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Do not use any solvents or cleansing agents.