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Teac A-2300SR - Torque Measurement Procedures for Tape Decks; Take-Up Torque Measurement; Back Tension Measurement

Teac A-2300SR
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12
TORQUE
MEASUREMENT
PROCEDURE
NOTE:
The
following
torque
measurements
should
be
made
with
a
spring
scale
that
is
calibrated
to
read
Torque
in
gram-cm.
for
a
7”
reel
with
a
small
reel
hub.
If
the
spring
scale
you
are
using
is
calibrated
to
read
Force
or
Weight
in
grams
the
Torque
must
be
calculated
using
the
Formula:
Torque
(in
gm-cm
or
02z:in)
=
Weight
or
Force
(in
gr.
or
02.)
x
radius
of
hub
(in
cm
or
inches)
If
you
are
using
a
reel
with
other
than
the
standard
2.5”
or
6.0
cm
(approx.)
diameter
hub,
the
Torque
must
be
calcu-
lated
using
the
same
formula
and
substituting
the
actual
radius
and
Weight
or
Force
reading.
All
Torque
and
Tension
measurements
must
be
made
with
the
automatic
shut-off
switch
(right
tension
arm)
held
in
the
ON
position.
Brake
Torque
Measurement
should
be
made
using
large
hub
reel
with
a
hub
diameter
of
4”
or
10.2
cm.
Fig.
7-3
Torque
Measurement
and
Formula
7-3.
TAKE-UP
TORQUE
1.
Place
the
empty
reel
on
the
right
reel
table
and
attach
spring
scale.
2.
Place
the
deck
in
the
Play
mode.
3.
Allow
the
rotation
of
the
reel
to
slowly
draw
the
scale
toward
the
hub.
4.
Hold
the
spring
scale
with
enough
force
to
allow
a
steady
reading.
5.
Repeat
the
procedure
for
the
Reverse
(q
)
Play.
6.
The
reading
or
calculated
value
should
be
approx.:
SMALL
size
value
is
for
reference
only
REEL
SIZE
LARGE|790
to
870
g-cm
(11
to
12
oz-inch)
SMALL
|370
to
410
g-cm
(5
to
6
oz-inch)
LARGE|1000
to
1100
g-cm
(14
to
15
oz-inch)
DIREC-
TION
TAKE-UP
VALUES
FWD
ie
BEY.
SMALL]500
to
550
g-cm
(7
to
8
oz-inch)
A-3300
SR
DIRECTION
|
TAKE-UP
VALUES
|
FWD
|
to.
ozinch
A-2300SR.
r
5
500
to
540
g-cm
ey
(7
to
8
oz-inch)
7-4
BACK
TENSION
1.
Place
an
empty
7”
reel
with
small
hub
on
the
left
reel
table
and
fasten
one
end
of
a
30”
Jength
of
string
to
the
reel
anchor.
2.
Wind
several
turns
of
string
counter-clockwise
around
the
hub.
Attach
spring
scale
to
string.
3.
Place
the
deck
in
the
Play
mode.
4.
Pull
the
scale
away
from
the
reel
against
the
motor
tor-
que
with
a
steady,
smooth
motion.
5.
Note
the
scale
reading
while
it
is
in
steady
motion.
(The
string
must
not
rub
the
reel
flanges)
6.
Repeat
the
procedure
for
the
Reverse
(
q
)
Play.
7.
The
reading
or
calculated
value
should
be
approx.:
SMALL
size
value
is
for
reference
only
A-3300
SR
T
DIREC-
|
REEL
TION
SIZE
BACK
TENSION
VALUES
FWD
LARGE
|
280
to
360
g-cm
(4
to
5
oz-inch)
SMALL
|
175
to
215
g-cm
(2.4
to
3
oz-inch)
REV
LARGE
|
320
to
400
g-cm
(4.5
to
5.6
oz-inch)
SMALL
|
185
to
225
g-cm
(2.6
to
3
oz-inch)
A-2300SR
DIREC-
TION
BACK
TENSION
VALUES
FWD
175
to
215
g-cm
(2.5
to3
oz-inch)
REV
185
to
225
g-cm
(2.6
to3
oz-inch)
Adjustment
Location
If
necessary,
adjust
slider
of
the
resistors
until
you
have
the
correct
scale
reading
for
optimum
torque.
Refer
to
adj.
location
below.
R2
R1
R3
cry
TH
|_|
ana
T+
#30
A-2300SR
Fig.
7-4
Adjustment
Location

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