Sony MHC-V73D Help Manual page 129

Help Guide
Home Audio System
MHC-V73D
There is severe hum or noise.
Move the system away from sources of noise.
Connect the system to a different wall outlet.
Install a noise filter (not supplied) to the AC power cord (mains lead).
Turn off surrounding electrical equipment.
The noise generated by the cooling fans of the system may be heard when the system is turned on. This is not a
malfunction.
Move the system away from the neon signs or fluorescent light.
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