Sony TC-K615S Mode D'emploi page 48

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Maintenance
Demagnetizing the Heads
After 20 to 30 hours of use, or when you
notice hiss and/or loss of high frequencies,
the residual magnetism built up on the
heads should be removed.
1
Turn the power off.
2
Demagnetize the heads with any
commercially available
demagnetizer.
Refer to the instruction manual of the
demagnetizer for detailed instructions.