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*" Stop"
Position
(1)
1.
(2)
Adjustment of Brake Mechanism
When
the
control
is
moved
to
"stop"
from
recording,
playback,
or
rapid
winding, the brake
is applied weakly to
takeup reel base aud strongly to supply reel base.
When
the
control
is moved
to
"stop"
from
rewinding,
the brake is applied strongly to takeup
reel and
weakly
to
supply
reel.
In
the
event
the strength
of brake
pressure
works
in reverse,
it will
cause
slackening
of recording
tape
when
the control is moved
to "stop'.
Figure
1 shows
the
position of mechanism
when the brake is applied.
Broke thor (8) teontacted
\,
(0)
—___bever (10)
eft veal bose 12)
0S
Ici
Shde base (113
Seveg 12)
interlocked
Ee
Pinh button lever 413)
rl
fig. 1
The slide base (11) must
be in contact
with push button
levers
(13)
for
rapid
winding
and
rewinding.
In
case
there
is an
aperture
between
the
slide
base
and
push
button
levers,
adjust
spring
(12).
There should be an opening
of 1-2mm
between
lever (10)
and slide base (11).
lever and slide base, either the brake
shoe is worn out or it
has come off.
The
brake shoe (8) is
composed
of hard
pressed
felt and
it is designed
to give
If there
is no
aperture
between
the
Check
and replace.
satisfactory
performance
even
when
it is worn
down
to
0.5mm.
Note:
Adjustment
of brake
on
the
takeup
reel
base
side
is done
by spring
(9).
This
adjustment
should
be done
only after checking
the points mentioned
under
1 and 2.
There should be an opening of 1-2mm
between lever (10)
and lever (7).
When
the brake fails to apply properly
if the rewinding
reel
base
is
turned
anti-clockwise,
spring
(4)
must
be
adjusted.
Note:
Since
the brake
on
the rewinding
or supply reel
base is closely related
with
takeup
reel
side's
brake, check
the points mentioned
under
1 and 2 also.
Adjustment
of Pinch
Roller
Position
At 'stop'
position,
the
pinch
roller
lever
should
be
as
shown
in figure 2, Since the
movement
of this pinch roller
lever (14) has much
influence on the opening angle of pad,
utmost caution should
be paid
in making
adjustment.
To
adjust, control the adjusting nut (15).
Adjust
the length
of functioning
bar
(17)
which
links
playback
button
lever
(16)
and
pinch
roller
lever (14).
After making
the adjustment,
remove
the capstan sleeve, so
that the tape speed will
become
4.75 cm/sec.,
and
press the
playback
button.
There
must
be an
aperture of 0.5-lmm
between
pinch roller
lever
(14) and
adjusting nut (15) at
this time.
To control the pressure of pinch roller, adjust spring (18).
For
adjustment
of pinch
roller,
refer
the
following
para-
graphs.
—~s: ay
Adwst the aut
so thot these Iwo lines
ae porollel,
fig. 2
At d75emiec
In Normal
Forwarding
(1)
(2)
In normal forwarding, it is most important that the record-
ing tape
is transported
at precise
speed
without
slipping.
To insure this, the tape recorder is pre-adjusted.
In case of
trouble, refer the following:
Adjustment of pressure of Pinch roller
The cause
of slipping
of the
recording
tape
between
the
capstan and the pinch roller may
be traced to weak pressure
of the pinch roller.
The presure of the pinch roller should
be 350+50g at 4.75
cm/sec.
To determine
the
pressure,
use
spring
gauge
and
pull the pinch roller shaft, and
gauge
the pressure
of the
pinch roller when
it stops
to rotate.
In making
this check,
do not load the recording tape.
Adjustment
of back
tension
To prevent
wobbling
or slackening
of recording
tape
at
normal forwarding,
tension
is applied
to the recording
tape
This is
and
adjustment
is made
by applying
slight brake
to the supply
recl
base.
done by back
tention
lever
(19),
by spring (20).
© Supply rect bese
Felt)
_> Back tension lever (29)
5: 7gr
Tession gouge
*Put the mechanism
in FWD,
place
the reel on the left side
spindle and
measure
the end
of thread
with
tension gauge
The strength at the
instant
when
the reel
rotates
in anti-clockwise
direction
is
by pulling in the direction
of arrow.
determined
as back tension.
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