Mark Levinson Reference Preamplifier N32 - Manual (Page 29)

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Care and Maintenance
To remove dust from the external cabinet of the Nº32, use a feather
duster. To remove dirt and fingerprints, we recommend isopropyl alco-
hol and a soft cloth. Apply the alcohol to the cloth first and then lightly
clean the surface of the Nº32, going with the grain of the brushed alu-
minum.
No maintenance of the internally-mounted phono modules is nor-
mally required.
Warning! At no time should liquid cleaners be applied directly to
the Nº32, as direct application of liquids may result in
damage to electronic components within the unit.