Teac A-400 - Mechanical Checks and Adjustments; Pinch Roller Pressure Adjustment

3.
MECHANICAL
CHECKS
AND
ADJUSTMENTS
TEST EQUIPMENT REQUIRED
1.
Spring
scale:
For
take-up
torque
check:
0
~
70g
(0
~
2.5
02)
For
fast
forward
and
rewind
torque
checks:
0
~
200g
(0
~
7.0
oz)
2.
String:
Length:
about
50
cm
(20”)
3.
Cassette
Reel
Adapter:
Diameter:
22
mm
* The
tools
above
(1
~3)
are
constructed
as
shown
in
Fig.
13.
4.
Cassette
Torque
Meter:
For
take-up
torque
check:
0
~
100
g-cm
For fast forward and
rewind torque checks: 0 ~ 160 g-cm
*
Use
of
the
Cassette
Torque
Meter
instead
of
the
spring
scale,
if
you
have
one,
is
recommended
for
easier
measuring,
(See
Fig.
19
on
Page
11)
Fig. 13 Spring Scale and Cassette Reel Adapter
5,
Spring
scale
(for
the
Pinch
Roller
pressure
check):
O~1kg
(2.2
Ibs)
6.
TEAC
MTT-111
test
tape:
For
tape
speed
and
wow/flutter
checks
7.
Wow/Flutter
meter:
MEGURO
DENPA
SOKKIK.K.
Model
MK-668A,
D
&
R
Co.,
FL-
ae
or
equivalent:
8.
Frequency
counter:
Digital
type,
capable
of
10
Hz
to
100
kHz
indica-
tion.
NOTE
All
the
mechanical
checks
and
adjustments
should
be
done
with
the Cabinet and the Front Panel removed. (See Section-2-1, 2-2)
PINCH ROLLER PRESSURE
The Pinch Roller pressure should be: 400 g + 20 g- (13. 5 as
15.0 oz)
Open the Cassette Holder door to the left.
Switch the POWER switch to the ON position.
Place the deck in the PLAY mode with no tape loaded.
Attach the spring scale to the Pinch Roller shaft as shown in
Fig. 14.
Gently draw-the scale away (in the direction of the arrow)
until the Capstan shaft and the Pinch Roller are completely
separated.
Gradually release the tension on the scale until the Pinch
Fe Oe
Roller
just
begins
to
rotate.
The
scale
should
then
be
reading
©
—-
Bend
here
to
adjust
1-407
approximately
400
g
+
20
g
(13.5
~
15.0
o2).
:
If
the
reading
is
out
of
specified
range,
adjust
the
tension
of
Fig.
14
Pinch
Rotler
Pressure
Measurement
the Pressure Spring by bending the tab of the Pinch Roller
Assy slightly.