Sony WALKMAN PROFESSIONAL WM-D6C Operating Instructions Manual page 12

MAINTENANCE
CLEANING THE HEADS
Clean the heads after every 10 hours of use to
enjoy optimum hi-fi stereo sound: moisten a
cotton swab or a soft cioésh with denatured
alcohol, and gently wipe the parts shown
below.
record/playback head
erase head pinch roller capstan
DEMAGNETIZING THE HEADS
Either prolonged use, or an accidental con-
tact with a piece of magnetized steel (screw-
driver, scissors, etc.) will magnetize the
heads causing an increase in tape noise. In
such an event, Gdemagnetize the heads using
a commercially available head demagnetizer.
CLEANING THE CASING
Clean the casing with a soft cloth slightly
moistened with water or a mild detergent
solution. Do not use solvents such as alco-
hol, benzine, or thinner as they may mar the
finish of the casing.
12
SPECIFICATIONS
Recording system
4-track, 2-channel stereo
Wow and flutter
+0.14% (DIN)
0.04% WRMS (NAB)
Tape speed deviation
+0.3% (speed tuning OFF)
Speed tuner variations
Approx. +4%
Frequency response
DOLBY NR OFF
¢ With TYPE IV cassette
40 - 15,000 Hz+3 dB
« With TYPE II cassette
40 - 15,000 Hz+3dB
¢ With TYPE | cassette
40 - 15,000 Hz+3 dB
S/N (NAB, at peak level)
DOLBY NRC
TYPE IV cassette
71 dB
TYPE Il cassette
71 dB
TYPE | cassette
67 dB
DOLBY NR B
TYPE IV cassette
65 dB
TYPE II cassette
65 dB
TYPE | cassette
61 dB
DOLBY NR OFF
TYPE IV cassette
58 dB
TYPE Ii cassette
58 dB
TYPE | cassette
54 dB
Total harmonic distorsion
0.9% with TYPE IV cassette
MIC (PLUG IN POWER)
(stereo minijack) x 1
0.25 mV with low impedance
microphone
LINE IN (stereo minijack) x 1
77.5 mV (47 kilohms)
Inputs