Technics RS-640US

ERASING
When
recording,
any
previously-recorded
material
on
the
tape
Is
erased
automatically.
To
erase
an
existing
recording
without
making
a
new
one,
disconnect
the
microphones
or
other
input
connection
cords,
set
the
MICROPHONE
LEVEL
controls
and
the
LINE
INPUT
LEVEL
controls
to
minimum,
and
operate
the
unit
in
the
same
way
as
for
recording.
All
previous
recordings
are
completely
erased
as
the
cassette
runs
from
beginning
to
end
on
each
side.
MAINTENANCE (Refer to fig. 4.)
The
head
assembly,
the
capstan
and
the
pressure
roller
are
always
in
contact
with
the
tape
during
operation.
Therefore,
they
tend
to
get
dirty
very
easily
and
have
an
adverse
influence
upon
the
sound
quality
and
the
level.
Dirt
can
cause
sound
loss,
noise
and
deterioration
of
the
frequency
characteristics.
Therefore
it
is
occasionally
necessary
to
clean
these
parts
as
follows.
HM
Remove
the
cassette
and
wipe
the
capstan
and
the
pressure
roller
with
a
soft
cloth.
When
the
PLAY
button
is
pushed,
the
head
assembly
becomes
accessible.
Clean
the
head
assembly.
If
the
dirt
is
excessive,
wind
a
small
piece
of
soft
cloth
around
the
piece
of
wood
and
apply
a
slight
amount
of
alcohol
to
it.
Notes:
1.
Don’t
allow
magnetic
materials,
such
as
a
screwdriver
or
a
magnet,
near
the
head
assembly.
2. When cleaning, be careful not to bend the tape guides.
3.
Don’t
attempt
to
clean
the
cabinet
with
alcohol,
benzine
or
thinner,
because
it
may
damage
the
finish.
If
the
cabinet
is
dirty,
clean
with
a
soft
cloth
dampened
with
a
soap-and-water-
solution.
MEMO
TROUBLESHOOTING.
lf
operation
of
this
unit
does
not
seem
normal,
check
the
following
points
before
requesting
service.
If
the
trouble
cannot
in
this
way
be
determined
and
corrected,
contact
the
dealer
from
whom
it
was
purchased.
1.
After
the
tape
cassette
is
inserted,
the
tape
does
not
move
when
the
PLAY
button
is
pushed.
«Is
the
power
cord
correctly
connected
?
-
ls
the
POWER
switch
pushed
in
to
the
“ON”
position
?
-
ls
the
PAUSE
button
released
?
2. Although the tape moves, no sound is heard.
«ls the tape blank ?
-
Are
the
connections
of
amplifier
and
speakers
correct?
«Are
connection
cords
from
this
unit
to
the
amplifier
correctly
connected
?
-
Is
the
level
control
of
the
connected
amplifier
set
to
the
correct
position
?
-
Is
the
monitor
switch
of
the
connected
amplifier
set
to
the
correct
position
?
~
Is
the
OUTPUT
LEVEL
control
set
to
the
correct
position
?
3. Sound is distorted.
«Is the recording level too high?
els the playback output level too high ?
«Is
the
input
impedance
of
the
connected
amplifier
appropriate
?
4. The RECORD button cannot be pushed down.
«ls the tape cassette inserted correctly ?
«Have
the
recording-prevention
tabs
of
the
cassette
been
removed ?
5.
Playback
sound
is
hoarse
or
vibrates.
Recorded
sound
is
not
clear.
«
Are
the
head
surfaces
dirty
?
-
ls
foreign
material
adhered
to
the
pressure
roller
and/or
the
capstan
?