Teac A-4010GSL - Mechanical Measurement and Adjustment; Pinch Roller Pressure; Flutter & Tape Speed Measurement

5
MEASUREMENT
AND
ADJUSTMENT
-MECHANICAL
-
PINCH ROLLER PRESSURE
Pinch
roller
pressure
is
supplied
by
pinch
roller
pressure
spring
only
and
it
is
therefore
most
important
that
the
solenoid
plunger
has
fully
bottomed
before
taking
pressure
measurement.
1.
Block
the
automatic
shut-off
arm
in
the
OW
position.-—
2.
Attach
a
suitable
spring
scale
to
the
pinch
roller
shaft.
3.
Place
the
unit
in
the
play
mode
(§Bor—a@)
and
holding
the
scale
as
illustrated,
slowly
draw
it
away
from
the
pinch
roller.
4.
Note
the
reading
on
the
spring
scale
at
the
instant
the
pinch
roller
stops
rotating.
;
5.
The
spring
scale
should
indicate
1.52.5
kg
(3.3%5.5
lbs).
6.
If
adjustment
is
necessary,
adjust
the
double
nuts
on
the
capstan
solenoid plunger.
PINCHROLLER
Vom
0-113
Fig.
5-1
Pressure
Measurement
Fig.
5-2
Pressure
Adjustment
Nuts
FLUTTER
&
TAPE
SPEED
MEASUREMENT
_
Flutter
should
be
measured
in
playback
mode
using
a
TEAC
flutter
free
tape
YTT-2003-2002.
Connect
test
equipment
to
unit
as
shown
in
the
figure.
Measurement
of
flutter
should
be
made
in
accordance
with
NAB
standards.
Values
obtained
with
different standards
or
equipment
can
not be compared.
Flutter
should
not
exceed.
7-1/2ips:
0.20%
3-3/4ips:
0.25%
The
tape
speed
should
be
measured
using
TEAC
flutter
free
tape,
model
YTT-2003-2002.
These
tapes
contain
a
highly
accurate
3
kHz
tone.
The
indicated
frequency
should
be
2985
“3015
kHz
for
all
speeds,
both
directions.
TEST UNIT
FREQ, COUNTER
M-0342
These
figures
apply
to
any
tape
position
and
direction
(such
as
full
take-up
reel,
full
Fig.
5-3
Flutter
&
Tape
Speed
supply
reel
or
about
mid
point).
Measurement