122
6-4. CAPSTAN ASSEMBLY
THRUST
1)
Turn
the
thrust
adjusting screw
so
that
thrust
of
the capstan shaft
is
within
0.05
mm
to
0.15
mm.
Thrust
play
0 .
05
mm
to
0.'5
mrn
Flywheel
Fig.
6-5
6-5. TAKEUP TORQUE
Takeup torque adjustment
is
critical
to
stabilize
tape travel and reduce variations in tape speed.
1)
Load a cassette
torque
meter
(0
to
100
g-cm,
1.4 oz-inch) in
the
cassette holder. .
2) Measure
the
torque
by
running the tape
of
the
meter
in the reproduce mode. The meter read-
ing should
be
45
-
65
g-cm
(0.6
-
0.9
oz-inch).
3)
If
the reading
is
outside
this
range, clean
the
surf,ace
of
the
idler
pulley
in
the
reel table
as-
sembly
which
comes
into
contact
with
the
tape using cleaning
liquid.
Also check the
operation
of
the
moving parts
of
the
reel table
assembly.
4)lf
the reading
is
still unsatisfactory, replace
the
reel table ass'y.
6-6.
FAST FORWARD
AND
REWIND
TORQUE
1)
Load a cassette
torque
meter
(0
to
160
g-cm,
2.20z-inch).
2)
With
the deck in the fast
forward
and
rewind
modes, read the meter.
If
the
meter
is
provid-
ed
with
tape, note the readings
with
the
tape
fully
wound
on
the
reel
taking
up
the tape in
each mode
so
that
the measurement
is
not
influenced
by
the
tape's inertia. The fast
for-
ward
torque
must
be
in
the
range
90
-
160
g-cm (1.3 - 2.2 oz-inch) and the rewind
tor-
que must be in
the
range
90
-
160
g-cm (1.3
- 2.2 oz-inch).
3)
If
the readings
are
outside these ranges, clean
the
surface
of
the
idler
pulley
with
cleaning
liquid
and check the operation
of
the moving
parts
of
the reel table ass'y.
44
6-7. PINCH
HOLLER
PRESSURE
Pinch
roller
pressure
must
also be adjusted
to
the
correct
value
to
stabilize tape travel and
reduce
variation
in tape speed.
1)
Remove the cassette
door
cover
to
install the
torque
scale.
2)
With
the deck in the reproduce mode, attach
the
scale
near the shaft
of
the pinch roller,
being careful
not
to
touch
the
pinch
roller.
See
Fig. 6-6.
3) Move the
scale
gradually in the
direction
of
the
arrow
until
the capstan shaft and pinch
roller
are
completely
separated.
4)
Gradually
return
the
pinch
roller
and note the
reading on the scale when the pinch
roller
touches the capstan and starts
rotating
. The
reading should be between
390
and
490
g
(13.8 and 17.3 oz).
5)
If
the reading
is
outside this range, repalce
the
pinch
roller
pressure spring
or
adjust
the
pressure
by
bending the spring
as
shown in
Fig. 6-6.
Bend here
to adjuu
Fig.6~
,
To Next Page
Loading...
