Sharp RT-1157H - Page 7

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MECHANICAL
PAUSE MECHANISM ADJUSTMENT (Refer to Figure 7—1)
1. Set the unit in play mode (push the key marked P )
and
slowly
push
the
pause
key.
Make
sure
that
the
take-
up
idler
and
pressure
roller
come
respectively
off
the
take-
up turntable and capstan at the same time.
2.
If
the
operation
1
above
is
found
not
normal,
adjust
it
by
bending
a
part
(marked
A)
of
the
pressure
roller
lever.
PRESSURE ROLLER PRESSURE ADJUSTMENT
(Refer to Figure 7—2)
1. Set the unit in play mode.
2.
Use
a
tension
gauge
(0
to
500
grams)
to
push
it
to
a
part
indicated
in
Figure
7-2
of
the
pressure
roller
unti!
the
pressure
roller
comes
off
the
capstan.
After
that,
gradually
weaken
the
applied
force
in
the
reverse
direction
unti!
the
pressure
roller
hits
the
capstan
(say,
it
begins
to
rotate)
and
make
sure
that
the
tension
gauge
is
then
reading
250
to
350
grams
(8-13/16
oz
to
12-11/32
02).
3.
If
the
above
value
is
not
satisfied,
adjust
the
pressure
roller
pressure
spring
by
bending
it
or
replace.
CAPSTAN’S
THRUST
CLEARANCE
ADJUSTMENT
(Refer to Figure 7—3)
1.
Slowly
rotate
clockwise
the
screw
adjusting
the
capsian’s
thrust
clearance
until
there
is
no
clearance
found.
2.
Next
rotate
counterclockwise
the
said
screw
by
1/5
to
2/5
turns
from
the
above
point.
Since
screw’s
pitch
is
0.5
mm
(.0197
in.),
a
clearance
of
0.1
to
0.2
mm
(.0039
in.
to
.0079
in.)
is
thus
produced.
TAKE-UP
PULLEY
POSITION
ADJUSTMENT
(Refer to Figure 7—3)
1. Set the unit in play mode.
2.
Make
sure
that
the
take-up
idler
becomes
in
contact
with
the
take-up
pulley
as
indicated
in
Figure
7—3.
3.
If
the
operation
2
above
is
not
satisfied,
adjust
the
position
of
take-up
pulley.
(Note
that
the
take-up
pulley,
made
of
rubber,
is
movable
over
the
capstan.)
a
ADJUSTMENT
Take-up turntable
Take-up idler
Figure 7—1
Tension gauge
Capstan
Pressure
roller
pressure
spring
Figure
7—2
Capstan
Take-up pulley
Take-up idler
{.0039 in. to .0079 in.)
Flywheel
Screw adjusting the capstan’s thrust clearance
Figure 7—3
TORQUE
CHECK
IN
PLAY/FAST
FORWARD/REWIND
'
MODES
(Refer
to
Figure
8-1)
lis
35
to
60
gram-em
(1—15/64
oz
to
2—1/8
oz)
Over
70
gram-cm
(2—15/32
oz)
Mount
a
torque
measuring
reel
on
the
turntable
{on
the
take-up
side
at
Play
or
Fast
Forward
mode
and
to
the
supply
side
at
Rewind
mode).
.
Gradually
weaken
an
applied
force
by
the
tension
gauge
until
the
turntable
begins
to
rotate
at
a
nearly
steady
speed,
and
measure
the
reading
of
tension
gauge.
_
Normal
torque
values
in
each
mode
are
tabulated
below.
Note:
in
play
mode,
check
that
when
the
turntable
(take-up
side)
is
stopped,
there
is
no
slipping
between
the
turntable
and
take-up
idler
or
between
the
take-up
idler
and
take-up
pulley.
Torque value
Over 70 gram-cm (2—15/32 oz)
PLUNGER/SOLENOID
POSITION
ADJUSTMENT
(Refer
to
Figure
8—2)
1.
Set
the
unit
in
Play
or
Record
mode
to
stop
the
turntable
(take-up
side),
then
the
automatic
stop
circuit
functions
to
attract
the
plunger/solenoid.
At
the
time,
if
the
setting
position
of
the
plunger/solenoid
is
not
normal,
the
plunger/
solenoid
interlocking
lever
can‘t
fully
move
the
play
lever
lock
plate
so
that
the
mechanism
can’t
get
in
a
stop.
In
this
case,
loosen
the
screw
retaining
the
plunger/solenoid
to
adjust
the
setting
position
of
the
plunger/solenoid
(to
make
the
plunger/solenoid
proper
be
in
parallel
with
the
mecha-
nism
main
chassis.)
_
With
the
unit
placed
in
Play
(or
Record)
mode,
make
sure
that
the
plunger/solenoid
interlocking
lever
is
in
contact
Plunger/solenoid
Oo 0
Selector lever of
plunger/solenoid
interlocking lever
(0 to .0197 in.}
05~O0mm
Play lever
Plunger/
solenoid
Interlocking
lever
il
20 mm (.7847 in.)
in dia,
Turntable
Torque
measuring
reel
Tension gauge
Figure 8—1
with
the
play
lever
lock
plate
and
simultaneously
that
there
is
a
clearance
of
0
to
0.5
mm
(0
to
.0197
in.)
between
the
selector
lever
of
the
plunger/solenoid
interlocking
jever
and
the
plate
spring
of
the
rewind/fast
forward
operation
lever.
_
Set
the
unit
in
Fast
Forward
(or
Rewind)
mode
and
make
sure
that
the
plunger/solenoid
interlocking
lever
is
in
contact
with
the
fast
forward/rewind
lever
lock
plate.
Next
check
that
the
fast
forward
{or
rewind}
lever
is
released
enough
to
fully
attract
the
plunger/solenoid
iron
core.
Plunger/solenoid
Plunger/solenoid
retaining screw
Plunger/solenoid
spring pin
Mechanism main
chassis
lock plate
Rewind/fast forward
operation lever
Fast forward/rewind
lever lock plate
| Lateral view | view
Figure 8—2