Tape Tension Brake Check; Tension Arm Adjustment - Sony AV-3600 Service Manual

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4-7.
TAPE
TENSION
BRAKE CHECK
This
adjustment
corrects
the
back
tension applied
by
the
Tension-Brake
Servo
to
the
Supply
Reel.
1
.
Place a
full reel
of tape
on
the
Supply-Reel
Table.
Set
the
Function
Lever
to
the
FORWARD
posi-
tion.
Set
the
SKEW
Lever
in
the
middle
position.
2.
Make
a loop
in
the tape
and
attach
a
spring
scale
as
shown
in
Fig. 4-8.
3.
Pull
the
scale in
the direction indicated
-
a
steady
pull
at
approximately
the
correct
tape
speed should
give
a
reading of
30
to
45
grams.
4.
If
not,
remove
the
Reel Panel
and
adjust
the
position of
spring
bracket (A)
to
obtain
a
correct
reading.
See
Fig. 4-8.
5.
Repeat
the
tension
check
using a
supply
reel
with
a
few
turns of tape
on
it.
It
should
yield a read-
ing
of
65
grams
or
less.
If
it
does
not,
proceed
to
Steps 6
through
10
and then
repeat Steps
1
to
3.
6.
Set
the
Function
Lever
to
the
FORWARD
po-
sition.
7.
Check
the distance
between
the
Tape Guide
Pin
on
the
Tension
Arm
and
the
extreme
left
edge
of the
drum
deck
as
shown
in
Fig. 4-9.
It
should
be about
1
mm.
Swing
the
Brake
Band
as
needed
to obtain the correct
spacing.
8.
Check
for clearance
between
the hole
in
the
chassis
and Item
®
shown
in Fig. 4-9.
If
the
correct clearance
cannot be obtained,
bend
Part
A
with
a
pair
of
pliers
to
obtain
the gap.
(Don't
bend
it
too much.)
9.
Check
the
distance
between
the
rod and
the
Tension
Arm
as
shown
in Fig. 4-9. It
should be
2
mm.
Bend
the
end
of
rod
as
needed
to obtain
the
correct spacing.
10.
Set the
Function Lever
to
the
STOP
position.
Check
the position of the
Tape Guide
Pin
shown
in Fig. 4-9.
Reposition
the
Tension
Arm
Spring
Bracket
to
obtain the
correct position.
Step
7
Step
7
Step
9
clearance
Fig. 4-9.
Tension
arm
adjustment
4-r

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