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7-4-7.Checking After Adjustment
—
Tape
running
may
show a slight change
depending
upon
the type of the cassette
tape (thick or thin
tape),
the
start,
middie,
or
end
of
cassette
tape
winding,
etc.
After
performing
the
tape
path
adjustment
with
use of an alignment
tape, be sure
to
check
the
following
points.
Incidentally,
the
alignment
tape
to be used
should
be T-120
or T-
160
cassette
should
be a good
one
without
any
damage
to it.
(1) Try to play back the alignment tape (NTSC HiFi
400Hz) and confirm
that the envelope waveform
rise immediately
and that there is no flucuation
in the envelope waveform
and the audio output
waveform.
(2) Load a cassette tape T-120 and start recording
operation
in the
standard
mode.
1 kHz should
be
fed
to
the
audio
input
terminal
when
recording. After
recording, the following
points
should
be checked.
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envelope
waveform
rise
immediately,
and
no
fluctuation
in
the
envelope
waveform
is
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first half period or the last half period. Further,
check to be sure
that no fluctuation
occurs
in
the audio waveform.
Also confirm
that neither
the tape curling
or derailing
is caused
on
the
upper or lower flange and the on the read side
of the drum.
2.
Confirm
that no tape curling or derailing occurs
in the upper or lower flange of each tape guide
and
the
read
side
of the
drum
during
each
mode of operation, namely, FF, REW, F. SEARCH,
and
R. SEARCH.
3.
Confirm
that
the
envelope
waveform
rise
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to the
PLAY
from
each
mode
of FF, REW, F.
SEARCH,
R. SEARCH,
or POWER
OFF (INITIAL)
and that no tape curling or derailing occurs
in
the upper or lower flange of the each tape guide
and
on
the
read
side
of the drum.
(3) Load
a
T-160
cassette
tape
and
perform
recording
operation
in the
SP
mode.
1 kHz
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recording.
Now,
confirm
that
the
envelope
waveform
rise immediately
upon
starting
the
playback
of
the
recorded
portion,
and
that
neither
fluctuation
in the
envelope
waveform
nor
a speed
drop
occurs
during
the first half
period or the last half period. Also confirm
that
no
tape
curling
or derailing
is caused
in the
upper
or lower
flange
of each
tape
guide
and
on
the drum
lead
surface.
(4) Perform
recording
for 60 seconds
in the SP
mode
at the start
of T-160
cassette
winding.
Play back
the recorded
portion
and
repeat
the
F.SEARCH
«
R.SEARCH
ten
times,
following
which
confirm
that no damage
is done
to the
tape edge. If any damage
is found
on the tape
edge,
a
proper
step
must
be
taken
as
below
depending
upon
the symptom
obserbed.
1.
When
a sawtooth
shaped
damage
is caused on
underside
of the tape
edge
by the
REV
guide
1) Check to see if damage
is done to the tape
by the
REV
guide.
2) Loosen the tilt adjustment screw of the ACE
head
bracket
by turning
it 135°
counter-
clockwise.
3) Make
readjustment
of the ACE head
bracket
(azimuth, height and adjustment of X value)
by seeing
item
P.11.
4) Confirm
that
no
fluctuation
in the
audio
level
is
caused
by
loosening
the
tilt
adjustment screw in steps 1) and 2) above.
Move
the
screw
a
little
back
if
any
fluctuation is found (but never move it back
to the original
position). After adjusting
the
tilt adjustment
screw
is readjusted,
perform
step 4)
once
again.
5) Confirm
again
that the T-160 cassette
tape
does
not sustain
any damage.
6) Perform
the recording
and
playback on
the
T-120
and
T-160 cassette
tape and confirm
that no
fluctuation
occurs
in the envelope
waveform
and
the audio
waveform.
(Special nut for ACE head
height adjustment)
(Azimuth
adjustment
screw)
(Tilt adjustment
screw)
(Do not adjust as this screw
has been
fine adjusted
at the factory.)
Fig. 7-4-10. Compl Head Bracket
— 102 —
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