Teac C-3X - 4-5 TAPE SPEED; 4-6 WOW AND FLUTTER

4-5 TAPE SPEED
STANDARD speed
1.
Connect
a
frequency
counter
to
the
deck
as
shown
in
Fig.
4-5.
2.
Play
a
tape
for
about
five
minutes
to
warm
up
the
deck,
then
load
a
TEAC
MTT-111
test
tape
containing
a
3000-Hz
test
tone
and
play
the
test
tape
from
the
beginning.
3.
While
the
tape
is
playing,
use
a
common
slotted
screwdriver
with
the
handle
completely
insulated
from
the
blade,
and
adjust
the
control
on
the
MOTOR
PCB
(as
far
as
possible)
for
a
reading
of
3000
Hz
(Spec.
3000
Hz
+5
Hz)
on
the
frequency
counter.
4,
Play
the
tape
at
the
beginning
and
at
the
end,
and
check
that
the
speed
deviation
is
within
the
prescribed
limits
by
observing
that
the
reading
on
the
frequency
counter
never
deviates
more
than
+45
Hz
from
3000
Hz,
nor
drifts
more
than
30
Hz
at
any
given
time.
HIGH speed
5.
Set
the
deck
to
HIGH
speed
and
follow
all
the
procedures
described
above.
Since
the
speed
is
doubled,
all
the
values
described
in
the
preceding
steps
are
also
doubled
to
be
com-
patible.
6.
If
the
tape
speed
is
not
within
the
prescribed
specifications,
check
the
pinch
roller
pressure
and
the
tape
transport
mechan-
ism
for
any
abnormality,
and
make
sure
the
tape
path
is
clean.
Frequency Counter
—
g 00
Oscillator
Wow &
Flutter Meter
DECK
(under TEST{—
TAY
LINE IN
Q0°
JURY
ouTPUT
Fig. 45
Fig. 4-6 Tape speed adjustment location
4-6 WOW AND FLUTTER
Note: These measurements should be made at the beginning, middle,
and the end of the tape.
1) PLAYBACK
STANDARD Speed
1.
Connect
a
wow-and-flutter
meter
to
the
deck
as
shown
in
Fig.
4-5.
2. Load and play a TEAC MTT-111 test tape.
3.
Check
that
the
reading
on
the
wow-and-flutter
meter
is
within
0.08%
(WRMS).
2) SIMULTANEOUS RECORD/PLAYBACK METHOD
STANDARD Speed
4.
Load
a
TEAC
MTT-501
test
tape
(blank)
and
record
a
3000-Hz
signal.
5. With the MONITOR switch in the TAPE position, note the read-
ing on the wow-and-flutter meter, it should not be more than
0.25% (RMS).
HIGH Speed
6. Repeat the above procedures with the deck set to HIGH speed.
The wow and flutter should not be more than 0.18% (RMS).
3)
NON-SIMULTANEOUS
RECORD/PLAYBACK
METHOD
STANDARD Speed
7.
Rewind
the
tape
to
the
beginning
of
the
recorded
section
pre-
viously
made
in
step
4,
and
play
it
at
STANDARD
speed.
8. The wow and flutter should not be more than 0.25% (RMS). ~
HIGH Speed
9.
Rewind
the
tape
to
the
beginning
of
the
portion
previously
recorded
in
and
play
it
at
HIGH
speed.
The
wow
and
flutter
should
not
be
more
than
0.18%
(RMS).
4-7
MICROSWITCH
(A)
ASSEMBLY
CLEARANCE
1.
Insert
a
blank
cassette
and
close
the
cassette
holder.
2. Loosen the two screws on the microswitch (A).
3.
Move
the
switch
so
that
actuator
of
the
switch
contracts
the
safety
lever.
4.
Adjust
the
switch
position
to
obtain
a
clearance
of
between
0.1
mm
to
0.3
mm.
5. Retighten the screws.