Sennheiser Rack-mount Receiver EM 300 G3 - Manual (Page 49)

Cleaning the receiver
48
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. Do not use any
solvents or cleansing agents.
CAUTION! Liquids can damage the electronics of the receiver!
Liquids entering the housing of the receiver can cause a short-circuit and
damage the electronics.
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Keep all liquids away from the receiver.