Teac A-300 - Mechanical Checks and Adjustments; Torque and Pinch Roller Pressure Adjustments

5.
MECHANICAL
CHECKS
AND
ADJUSTMENTS
5-1. TAKE-UP AND SUPPLY TORQUE
Specifications:
—
5-3. PINCH ROLLER PRESSURE
Take-up: 40 to 60 g-cm (0.6 to 0.8 oz-inch)
Supply: 3 to 8 g-cm (0.04 to 0.11 oz-inch)
Depress POWER Switch ON to apply AC power.
Load the cassette torque meter (for take-up and supply
torques).
Place the deck in the play mode and read the pointer
indication on the right-hand dial scale to check the
take-up torque.
While continuously playing, read the pointer indication
on the left-hand dial scale to check the supply torque.
If the reading(s) are out of the specified range, clean
the driving surfaces of the reel table ass’y and all other
driving parts relative to the take-up and supply torque
function with the TEAC TZ-261B rubber cleaner or
which pure alcohol.
If the above cleaning is ineffective for torque correc-
tion, replace the Reel Table Ass’y.
5-2.
FAST
FORWARD
&
REWIND
TORQUE
Specifications:
Fast Forward torque: 80 to 150 g-cm
(1.1 to 2.1 oz-inch)
Rewind
torque:
100
to
150
g-cm
(1.4
to
2.1
oz-inch)
Depress
POWER
Switch
ON
to
apply
AC
power.
Load
the
Cassette
Torque
Meter
(for
fast
forward
and
rewind
torque).
Place
the
deck
in
the
FF
or
REW
mode
and
read
the
pointer
indication
on
the
dial
scale.
The
Meter
should
indicate
a
torque
of
80
to
150
g-cm
(1.1
to
2.1
oz-inch)
as
Fast
Forward
Torque
and
100
to
150
g-cm
(1.4
to
2.1
oz-inch)
as
Rewind
Torque.
If
the
indication
is
out
of
specified
range,
clean
the
driving
surfaces
of
the
Reel
Table
Ass’y
and
all
other
driving
parts
relative
to
the
Fast
Forward
&
Rewind
torque
function
with
the
TEAC
TZ-261B
Rubber
Cleaner
or
with
pure
alcohol.
—
“If
the
above
cleaning
is
ineffective
for
the
torque
correction,
replace
the
driving
parts
relative
to
these
torques.
Fig. 5-1 Cassette Torque Meter
Specification: 400g + 50 g (12.3 to 15.9 02)
RWNe
Remove Front Panel, then Cassette Holder Ass’y.
Depress POWER Switch ON to apply AC power.
Place the deck in the PLAY mode with no tape loaded.
Attach the spring scale to the Pinch Roller shaft as
shown.
Gently draw the Pinch Roller away from the Capstan
shaft in a directly downward direction until the Cap-
stan
shaft
and
the
Pinch
Roller
are
completely
sepa-
rated,
Gradually
return
the
scale
back
until
the
Pinch
Roller
just
begins
to
rotate.
The
scale
should
then
be
reading
approximately
400
g
+
50
g
(12.3
to
15.9
oz).
If the reading is out of specified range, replace the
Pinch Roller Ass’y or the Pressure Spring or adjust the
Spring Arm as shown.
Bend here
to adjust
Fig.
5-2
Pinch
Roller
Pressure
Measurement