Teac A-7300RX - Page 15

Seo
TORQUE MEASUREMENT PROCEDURE
“oe
a
a
RAINS
STENT
ET
I
IIE
CE
ETRE
s
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
Foumula:
Torque (in gm-*cm or oz*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.
REO
so
\
> takeve ToROUEFWO)
628
sy
rane
ES
WENT
AE
GS
OER
RN
I
AS
SO
Ea
Fig.
8-11
Torque/Tension
Measurement
and
Formula
8-9
TAKE-UP
TORQUE
1.
Place
the
empty
reel
and
attach
spring
scale
on
the
right
reel table.
2.
Place
the
unit
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.
The
torque
reading
should
be
approx.:
REEL
SW
TAKE-UP
LARGE.
|
530
to
570
g
cm
(7.4
to
8.0
oz-inch)
SMALL
|
330
to
370
g
cm
(5.0
to
5.1
oz-inch)
16
8-10 BACK TENSION
1. Place an empty 7” reel with small hub on the left reel
table, and fasten one end of a 30” length of string to the
reel anchor.
2. Wind several turns string counter-clockwise around the
hub. Attach spring scale to string.
. Place the unit 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. The calculated valve should be approx.:
REEL SW BACK TENSION
LARGE | 430 to 470 g cm (6.0 to 6.6 0z-inch)
SMALL j 280 to 320 g cm (3.9 to 4.6 oz-inch)
Ww
Adjustment Location
If necessary, adjust slider of the resistors until you have the
correct scale reading for optimum torque. Refer to adj.
location below.
‘ Loosen
, _ this
screw
{ to Adjust
Decree = = A
Adjust
R154... TAKE-UP TORQUE LARGE or SMALL
R155... BACK TENSION LARGE or SMALL
Fig. 8-12 Wire Wound Resistors Adj. Location
8-11 FAST FORWARD AND
REWIND TORQUE CHECK
Specification;
F.F/ REW (LARGE) _ 1.9 kg cm (27 oz-inch)
F.F/ REW (SMALL) _ 1.6 kg cm (22 02-inch)
No adjustment provided.FIXED Resistor (R156)