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Sansui QS-500 - Page 12

Sansui QS-500
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SIMPLE
MAINTENANCE
HINTS
Lf
the
Rear-Channel
Sound
Is
Shaky
You
may
sometimes
notice
the
sound
from
the
rear
speaker
systems
is
shaky
when
that
from
the
front
speaker
systems
is
not.
Probable
causes
of
this
con-
dition
include
the
following:
1.
The
record
is
damaged
or
worn
out.
2.
The
cartridge
stylus
is
damaged
or
has
clust
on
it.
3.
The
stylus
pressure
of
the
cartridge
is
either
too
light
or
heavey.
4,
The
cartridge
itself
is
faulty.
5.
The
level
of
the
input
signals
fed
to
the
QS-500
is
too
high.
6.
The
sound
in
the
record
or
tape
is
distorted
to
begin
with.
7.
The
stereo
separation
of
the
FM
tuner
is
poor,
or
the
FM
antenna
input
is
insufficient
and
the
broadcast
signal
contains
considerable
noise.
If
the
Separation
of
the
Front/Rear,
Left/Right
Channels
Is
Poor
While
your
QS-500
is
designed
so
that
the
sounds
from
the
four
speaker
systems
blend
with
one
an-
other
to
form
an
integrated
sound
field,
the
separa-
tion
of
the
front
and
rear
channels,
and
the
left
and
right
channels,
may
sometimes,
be
disturbingly
poor
for
one
of
the
following
reasons:
1.
The
program
source
itself
is
poor
in
stereo
sepa-
ration.
2.
The
left
and
right
channels
of
the
program
source
are
not
in
phase.
3.
The
left
and
right
channels
of
the
program
source
differ
in
output
voltage.
To
Connect
the
Front-Channel
Amplifier,
etc.
Use
the
pin
plug-equipped
shielded
cords
supplied
with
your
QS-500
to
connect
the
front-channel
amplifier.
If
you
should
choose
to
use
other
cords
for
some
reason,
they
should
be
relatively
thick
and
have
aminimum
of
distributed
capacity.
And
try
to
keep
them
as
short
as
possible.
Observe
the
same
cautions
when
connecting
tape
decks.
About
the
Place
of
Installation
The
bonnet
of
the
QS-500
is
designed
so
that
any
heat
radiated
inside
will
escape
through
it.
Due
care
should
be
taken
of
the
dissipation
of
such
heat
if
you
wish
to
place
something
on
top
of
the
QS-500
or
put
the
unit
inside
a
closed
cabinet,
etc.
Above
all,
avoid
placing
it
where
it
may
be
exposed
to
the
direct
sunlight.
Should
the
Power
Fuse
Blow
If
the
VU
meters
fail
to
glow
and
the
QS-500
re-
mains
dead
when
you
turn
on
the
Power/Rear
Speakers
Switch,
it
is
possible
that
its
power
fuse
has
blown.
If
this
happens,
disconnect
the
power
cord
from
the
AC
outlet
and
examine
the
power
fuse
on
the
unit’s
rear
panel.
If
you
find
it
blown,
find
out
the
cause
of
the
blowout
and
eliminate
it,
then
replace
the
blown
fuse
with
a
new
glass-tubed
fuse
of
the
rated
capacity
(3-ampere
for
100
to
127
volts,
2-ampere
for
220
to
250
volts).
Never
use
a
fuse
of
a
different
capacity
or
a
piece
of
wire,
even
as
a
stop-
sees
Cy
an
gap
measure,
or
serious
danger
could
result.
ioe
teri
BSR
TARE
NE
About
the
Quick-Acting
Fuses
If
the
VU
meters
of
the
QS-500
illuminate
but
no
sound
is
heard
from
both
or
either
of
the
rear
speaker
systems,
examine
their
connections
and
operation
once.
If
nothing
is
wrong
with
them,
it
is
possible
that
both
or
either
of
the
quick-acting
fuses
protecting
the
power
transistors
has
blown.
If
this
happens,
disconnect
the
power
cord
from
the
AC
outlet
and
check
the
two
quick-acting
fuses
on
the
unit’s
rear
panel.
If
you
find
both
or
either
of
them
blown,
discover
and
eliminate
the
cause
of
the
blowout,
and
replace
it
with
anew
2.5-ampere
quick-
acting
fuse
supplied.
Probable
causes
of
the
blowout
include
excessively
large
input
signals
and
a
short-
circuit
at
the
speaker
terminals.
i

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