BeforeRecording
As shown inthe above Fig,the Nakamichi
700 isof a 3-head typewhereineach of
erase,recordingand playbackheads is
individually installed.A part of a cassette
housing in whicha tape runs servesas a guide
for tape run.Asa casemay beaccording to
each plastic moulding, highfrequency part
may belowered because of the unfavourable
azimuth alignment of head slitbetween
recording and playback heads.
Accordingly, itis recommended that you
perform an accurateazimuth alignment
when you change a tape to another.
Head AzimuthAlignment
Record Head
Load a cassetteinto the cassette
compartment.
Turn the Test Tone Switch on.
Touch the Record Button and then the
Play Button to startthe tape.
Set the Monitor Switch to "Tape".
Adjustthe RecordHead Azimuth
Alignment (RH)Screw so that the both
Alignment Beacons flickeralternately.If
only the upper Alignment Beacon flickers,
turn the RH Screw clockwise.
Butifonly the lower Alignment Beacon
flickers,turn itcounter-clockwise.
Caution
Ittakesabout 0.3 second until the
Alignment Beacon responds to the
turningof RH Screw. Itisnecessaryto
turn the RH Screw littleby little with a
reasonable interval.Ifyou turn itto the
wrong direction, the Alignment Beacons
will not flicker.Turning direction must be
carefullydetermined according to the
above instructions.
Itis nota fault of the deck!
Anti-TapeSpillDevice:
The Nakamichi 700 is equipped with the
tape spillsensingsystemwhich stops all
the functionsof the unit instantaneously
when spill of the tape is about to start. In
case
the
functions
of
the
unit
stop
automatically, please check the cassette
first. The tape spill usually occurs with a
second classcassettetape the housing of
which
is
being
moulded
with
less
precision,
and physical property of tape itselfisrather
poor. Alsoa thinner tape such as C-120
cassette often causes heavy frictioninside
the
cassette housing
which
will
also
be
sensed by the said device.
Head Maintenance
(1)PlaybackHead
No
adjustment
is
necessary
with
respect
to
the playback head azimuth, sinceitis
adjusted prior todeliveryfromour factory.
(2)Head Cleaning
All parts that come into contact with the
tape must befrequentlycleaned.Even the
best tape formulationsleavea deposit of
oxide sheddings on the heads, pinch roller
and capstan.Failureto performa periodic
cleaningof these partscan resultin signal
dropouts, lossof high frequenciesand wow
and flutter.A cleaningkit is suppliedwith
the Nakamichi 700, but some Q-tips and
isopropyl alcohol(preferablyundiluted)
willperformquite adequately.
(3)Demagnetizing
Allmetal partsthat come intocontact with
the tape must beoccasionallydemagnetized
to prevent the build-up of residual
magnetism that can add hissto and
partiallyerasethe high frequencieson a
tape being played. Although the heads and
capstan of Nakamichicassettedecksrequire
demagnetizationmuch less frequentlythan
most other tape decks, itshould
neverthelessbeperformedonce every50
hours of use to beon the safeside.A
NakamichiDemagnetizerisrecommended
forthispurpose since itis speciallydesigned
for
ease
of
use
with
cassette
decks,
but any
properlydesigned demagnetizerwilldo.
Remove alltapesfromthe vicinityof the
tape deck before proceeding. Make sure the
tape deck is"OFF." Turn the
demagnetizer on and slowlybringthe tip as
closeas possible to the record/playhead
(itis not necessaryto demagnetizethe
erase
head).
Do
not
make contact
with
the
head unlessthe tip of the demagnetizeris
coveredwith thin vinylor rubber to avoid
scratchingthe surfaceof the head (a piece
of vinyltape may beused to coverthe tip
if itis not alreadycovered).Move the
demagnetizertipslowlyin a random
pattern about the surfaceof the head for
at least10secondsand then slowlymove it
towardthe capstan.Repeatwiththe
capstan, and then slowlywithdrawthe
demagnetizer.Turn itoffafteritis at least
2feetfromthe deck.Never turn the
demagnetizer offwhileitisclose to the
head or capstanasthismay semi-
permanently magnetize the metal part.
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