Mechanical Adjustments; Brake Adjustment - Pioneer RT-1011L Service Manual

6.
MECHANICAL ADJUSTMENTS
For
items
6.1
-
6.4
adjustments,
nev"er
fail
to
place
the tape deck in specified positions (6.L:
horizontal,
6.2 - 6.4:
vertical);
otherwise,
correct measuring value would nbt
be obtained.
With
these things
in
mind, proceed
ai
follows:
6.1
REEL BASE
HEIGHT
ADJUSTM ENT
In
the
case
of
incorrect reel
base
height,
or
replacement
of supply motor
or take-up motor,
sideboards
are removed and reel
base height
must be
adjusted.
1.
Place
the
tape deck
in a
horizo5rtal
position and check
to
make sure
the
panel
and
chassis
of the
transpbrt
mechanism are
firmly
attached.
2.
Loosen screw
to
allow
a
clearance
of
8.5mm between the mech panel and
reel
base
as
in
Fig.
18.
3.
Adjust supply and
take-up reel
bases
as
above.
6.2
BRAKE ADJUSTMENT
Required when tape slackerx or
when
sol'enoid
or
motor is
replaced.
First, place.the tape deck in
a
vertical position'
and check
the
following:
o
Is A in
Fig.
19 t2.8mm when the
solenoirl
is
not
:operatirrg?
o
Can
you rotate the motor
your hand
while,
pressing
shaft?
smoothly with
the
solenoid
o
Adjustment (Figs.
19
,
20l.
For
adjubting
the
take-up reel,
fast-forward
it for
about
2sec.'once
to minimize
unstableness
in
measuring values,
then push
the
STOP
bu.tton to'cause reel revolution
to
halt.
Should
the reel be'rotated before
measuring,
differences
in
measurihg values
would
result.
For
adjusting
the Supply reel, rewind
it
once,
then
make
the
adjustment.
These adjustments
are made
in (A) N
(D)
arrow-indicated directions.
With
these
things
in
mind, proceed
as
Tollows:
1. Load the ?-inch reel, fixing the string
on
the reel
base.
2. Pnll tension gauge
to
measure brake
friction,
pulling
in B (C)
direction
until
reel
turns.
3. Adjust
the
brake spring
hook position
so
that the
gauge reads
300
-
4509 (900
-
1350g-cm).
4. When the above
adjustments
fail
to
bring
the
desired results, check
the
following
points:
o
Soiled brake drum
O
Soiled brake felt
o
Faulty brake
guide
plate
o
Unstable brake
arm
5.
Measure
brake
friction by pulling
tension
gauge
in D (A)
direction.
Then, check
ratio of
brake friction
to
measured
value
of
step
3. It
should
be
2.3:1-3.7:1.
NOTE:
When
the value
in B
(C)
direction
indicates
4009, the
value
in D (A)
direction
is
optimum
at a
range
of
174
-
1089.
BRAKE
SPRING
BFTAKE GUIDE
PLATE
-l
To attach the
brake
drum
in
position
f
irmly,
gradual ly
tighten the two
setscrews
1, 2
alternately.
After
making
adjustment, fasten
firmly (more than
10kg'cm).
Cha
nge
spring
hook position.
6tu\\
fo\t\D
R U
M
,Y,
)I
SCREWS
20
12.8mm