571025

Marantz Model 5220 Manual

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di
rectly
to
the
rear panel
L11\1
E I
NPUT
.
The
outputs
of
the
Model
5220
remain connected
to
the
tape
monitoring
facilities
on
the
preampl
ifier
or
receiver.
It
is necessary
to
adjust
the
output
level
controls
of
the
ext
ernal tape deck and
the
rear panel
PLAY
/FM
CAL
controls
on the Model
5220
when using
the
Dolby
System .
The
following
section
will
outline
calibration,
recordi ng and
playback
procedures.
CALIBRATION
If
you
haven't
already done so,
obtain
a reel-to-
reel
Dolby
System
Calibration
Tape
from
your
Marantz dealer.
The
calibration
tape is also
available in cassette
format,
if
your
e
xternal
recorder is
another
cassette deck.
The
tape is
prerecorded
with
a
400
Hz
tone
at
the
specified
Dolby
level and is used
for
setting
the
output
levels
of
you
r external tape deck and
the
PLAY
/
FM
CAL
levels on
your
Model 5220. Use and
stor
e
the
calibration
tape
carefully
to
avoid
accidental erasure.
For
example, do
not
store
the
calibration
tape on
top
of
your
power
amplifier,
because th e magnetic fields produced
by
the
transformer
in
the
amplifier
could
partially
erase
the
tape. (The same holds
true
for
any cassette
tape!)
When
you
have obtained a cal
ibration
tape,
pro
ceed as
follows
:
1. Set
the
tape
monitor
switch on
your
receiver
to
"T
APE".
2. Depress
th
e
DOLBY
NR ON pushswitch.
3. Depress th e
DOLBY
FM-ON pushswitch.
4.
If
you
are using
the
251lSec de-emphasis
circuit
in
the
Model
5220,
switch
it
to
FLAT.
5. Load
the
Dolby
Calibration
Tape on
your
external recorder and play it.
6. Set
the
monitor
switch (es) on
the
ext ernal
recorder
to
"TAPE"
and adjust
the
output
level
controls
so
that
the
VU
meters register
7.
With
the
tape still playing, adjust the
PLAY/
FIVI
CAL
controls
on
the
rear panel
of
the
Model
5220
so
that
its
VU
meters register
DO.
8. When
the
levels are set, rewind
the
remove
the
calibration
tape .
NOTE:
The
Model
5220
may
be
left
in
the
stop
position
when using
the
Dolby
circuits
to
decode an external source.
The
decoded program
from
the
ext
ernal tape
recorder can be
monitored
through
the
amplifier
system.
To
make a cassette
copy
of
the program,
insert a cassette and record in the same manner as
a
Dolby
FM broadcast. Again,
the
cassette
you
record
will
be Dolby-encoded
to
obtain
the
maximum
effect
from
the
noise
reduction
pro
-
cess,
and no
adjustment
of
the
input
level
controls
is necessary.
If
you
have purchased a
Dolby
Calibration
cassette,
you
may play
the
cassette on
your
Marantz deck
to
confirm
the
playback reference
level.
The
meters should register
within
1 dB
of
the
"DO"
mark.
MULTIPLEX
FILTER
The
rear panel
MPX
FI LTE R switch activates a
,
high
filter
which
is specially designed
to
block
the
high
frequency
multiplex
pilot
and subcarrier
signals
which
are present in stereo FM broadcasts.
Although
these
pilot
and subcarrier signals are
outside the human hearing range,
they
can
inhibit
the action
of
the noise
reduction
circuit
when
making
Dolby
encoded recordings
of
standard FM
stereo broadcasts.
Normally,
it
is the
job
of
the
tuner
or
receiver
to
filter
out
these undesired signals.
Most
high
quality
tuner
sections already
provide
sufficient
(40
dB)
pilot
and subcarrier rejection. In
fact,
with
all
Marantz tuners and receivers, use
of
the
MPX
FI L
TER
is unnecessary. However,
to
ensure
correct
operation
of
the noise
reduction
circuitry
when used
with
other
brands
of
tuners
that
may
not
have
sufficient
pilot
and subcarrier rejection,
the
MPX
FILTER
is
provided.
If
you
are using a non-Marantz
tuner,
and
if
the
Dolby
cir
cuit
seems
to
have no
effect
when
recording
from
FM stereo, then activate
the
MPX
FI L
TER.
The
filter
will
then
block
the
high
frequency interference and
allow
the
Dolby
cir
-
cu
itry
to operate asdesigned.
13
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