Harman Kardon CD 401 - Maintenance; Head Cleaning

When the unit gets dirty, wipe it with a soft dry cloth. If
heavily contaminated, wipe it with a soft cloth soaked with
mild soapy water and then wipe with a dry cloth. Never use
alcohol, thinner, benzine or other volatile agent since the
painting may be damaged.
Head Cleaning
® Drop out, degradation of frequency characteristic or
wow & flutter may be caused when the recording and
playback combination head, capstan and roller get dirty
with magnetic material powder or dust. Clean these
parts from time to time so as to enjoy perfect tape
sound reproduction.
Before cleaning, open the CASSETTE COMPARTMENT
door.
Use a cotton swab slightly wetted with diluted an¬
hydrous alcohol and clean the recording and playback
combination head, erasing head, capstan and roller
which come into direct contact with the tape.
Do not wet the cotton swab with too much alochol.
Tape playback shall be started after thorough evapora¬
tion of alcohol.
® The recording and playback combination head, erasing
head and capstan will be magnetized gradually.
Since the magnetism causes noise generation and degrada¬
tion of high-frequency range characteristic, be sure to
demagnetize these parts with a head eraser.