Sanyo MR-410 - Page 2

MECHANICAL
ADJUSTMENT
To
measure
the
torque
of
the
tape
recorder,
a
torque
gauge
(Fig.
2)
and
a
tension
gauge
are
neccessary.
To
use
a
tension
gauge,
make
a
hole
in
the
side
of
the
Cassette
as
shown
in
Fig.
3.
Be
careful
that
the
tape
does
not
rub
against
the
edge
of
the
Cassette;
this will
make
correct
measurement
impossible.
1.
Take-up
torque
(measure
with
torque
gauge)
Play 40 - 60 gr/cm
Fast forward 60 - 120 gr/cm
Rewind 60 - 120 gr/cm
2.
Back
tension
(measure
with
tension
gauge)
Play 2- 15 gr/cm
Fast forward 2- 15 gr/cm
Rewind 2- 15-gr/em
3.
Tape
tension
"
|
As
shown
in
Fig.
4,cut
off
a
length
of
tape.
Tie
one
end
to
a
thread
connected
to
the
tension
gauge,
and
leave
the
other
end
hanging
loose.
Place
the
recorder
in
PLAY
mode
and
hold
the
tension
gauge
steady
(do
not
move
it
to
the
left
or
right).
When
the
tape
stops,
read
the
tension
gauge.
If
this
reading
falls
within
the
range
of
50
-
200
gr.,
no
adjustment
is
needed.
If
it
does
not
fall
within
this
range,
adjust
the
pinch
roller
pressure.
.
This
is
done
by
changing
the
hole
position
of
the
coil
spring
(R-158155a).
(Fig.
5)
Clean
the
pinch
roller
(with
alcohol
only).
so
that
the
tape
will
not
slip.
hole
Fig 3.
Capstan
R/P HEAD
Fig 5.
4. Button pressure |
Push
the
edge
of
the
button
as
shown
in
Fig.6.When
the
pressur
required
to
lock
each
button
falls
within
the
range
shown
below,
no adjustment is neccessary:
scape ea a
—?—
. Record/Play head azimuth adjustment
Stop—Play 800 ~ 1800 gr
Play—Stop 550 ~ 1000 gr
Stop—Forward 800 ~ 1800 gr
Stop—Rewind 800 ~ 1800 gr
Rewind—Stop 550 ~ 1000 gr
Stop—Record . 400 ~ 850 er
Record—Stop 250 ~ 1000 gr
If
the
pressure
does
not
correspond
to
the
above
figures,
adjust
the
strength
of
the
coil
springs
(28);
also
adjust
the
force
of
the
coil
spring
(22)
connected
to
the
slide
(21).
.
Push down PLAY
button |
EJECT
Vv
Si
Fig 6.
Maximum
output
and
frequency
response
can
be
obtained
only
when
the
record/playback
head
is
correctly
aligned
for
Azimuth.
Azimuth
alignment
refers
to
the
positioning
of
the
head
in
respect
to
the
tape
which
passes
across
it
during
recording
and
playback.
Since
the
head
adjustment
screw
is
set
and
sealed
at
the
factary,
adjustment
should
not
be
required
unless
the
screw
has
been
accidently
put
out
of
adjustment
in
some
manner.
If
a
record/playback
head
becomes
defective,
it
will
be
neccessary
to
align
the
new
head
for
correct
azimuth
after
installation.
To do so, proceed as follows;
1.
Thread
a
pre-recorded
test
tape
(cassette
type)
(7,000
Hz
standard
frequency
tape)
onto
the
recorder.
2.
Connect
an
AC
voltmeter
across
the
speaker
voice
coil
termi-
nals.
To
make
this
connection
without
removing
the
recorder
from
the
cabinet,
connect
an
external
speaker
or
a
dummy
load
resistor
(same
impedance
as
that
of
the
speaker
voice
coil)
to
the
MONIT
EXT.
SP.
terminal.
NOTE:
Set
the
voltmeter
on
the
1.5
VAC
scale.
3.
Depress
the
PLAY
button
and
turn
the
tone
control
clockwise
until
a
reading
is
obtained
on
the
AC
voltmeter.
4.
Rotate
the
head
adjustment
screws
clockwise
or
counter-
clockwise,
and
continue
this
procedure
until
maximum
output
is
obtained
as
indicated
by
the
AC
voltmeter.
. Head demagnetization
Magnetization
of
the
heads
may
result
when
the
continuity
of
the
head
is
measured
with
an
ohmmeter.
If
it
is
neccessary
to
meas-
ure
head
continuity,
the
head
should
be
demagnetized
after
the
continuity
check.
Head
magnetization
is
evidenced
by
a
high
residual
noise
(a
hiss-
ing
and
low
popping
sound)
when
a
virgin
or
completely
erased
tape
is
played
at
a
high
volume
level.
The
magnetization
may
be
neutralized
by
use
of
a
standard
de-
magnetization
tool.
The
tip
of
the
tool
should
not
be
used
through
the
pad
but
must
be
thin
enough
to
fit
between
the
pres-
sure
pad
and
the
record/play
head.
A
piece
of
cellulose
tape
should
be
placed
over
the
end
of
the
tool
to
prevent
metal-to-
metal
contact
between
the
tool
and
the
head.
After
demagnet-
ization
is
completed,
slowly
remove
the
tool
from
the
vicinity
of
the
head
BEFORE
the
current
is
turned
off.
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