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4-3. OTHER MECHANICAL ADUSTMENT PROCEDURES
4-3-1. MEASUREMENT AND
ADJUSTMENT
OF BACK TENSION
<<TOOL>>
Back Tension Meter ;
VFK0132
VHS
Cassette Tape
(180
min.
tape not
S-VHS
tape)
A
FWD
Tension Adjustment
<<SPEC>>
23g
to
27g
1.
Play
back the cassette tape from the beginning
and
wait
until the tape movement get the stabilization. (for
ap-
prox.
10
to
20
seconds)
2.
Pull
the Impedance Roller
in
the direction indicated
the
arrow
in
Figure
M28
secure
it
with a piece of adhesive
tape.
3.
Insert the Back Tension Meter into the
path
of a
tape,
and
measure the back tension.
P2
Probes
of
Gauge
Figure
M28
Measurement of Back Tension
4.
If
it
is
out of specification, replace the Tension spring.
4-10
B.
Rev Tension Adjustment
<<SPEC>>
30g
to
GOg
1.
Play
back the beginning of E
180
VHS
cassette
in
the
Reverse
play mode and wait for approx. 1 0 to
20
sec-
onds so that the tape movement
is
stabilized.
2.
Pull
the
Impedance Roller
in
the
direction indicated
by
the
arrow
in
Figure
M28
secure
it
with a piece of adhe-
sive
tape.
3.
Insert the Back Tension Meter Into the
path
of a
tape,
and
measure the back tension.
4.
If
it
is
out of specification, replace the Tension spring .
<<NOTE>>
While
measuring, make sure that the three probes
of
the meter
are all in
good
contact with the tape.
As
the
tension meter is vel}' sensitive,
we
recommend taking 3
separate readings.
Tension
Spring
Figure
M29
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