Since the calibration
is
extremely stable and
should
not
have
to
be
repeated (except
to
period-
ically check
it),
we
suggest
that you mark the
settings
of
your
recorder's
output
level controls
with a felt-tipped
pen.
Doing
so
will
enable
you
to
easily reset the controls
if
they
are
inadvertantly moved.
PROCEDURE FOR RECORD
CALIBRATION
Before proceeding
with
the record calibration,
be
certain
that
the playback adjustments
have
been
performed. DO
NOT
CHANGE TH E POSI·
TIONS OF THE RECORDER'S
PLAYBACK
LEVEL
CONTROLS
(if
any)
OR
THE 4300's
PLAY
CAL
CONTROLS.
When
calibrating a recorder that
is
connected
to
the TAPE
MONITOR
1 IN
and
OUT
Jacks,
be
sure
the SELECTOR Switch
is
not
in the TAPE
1 position.
When
calibrating a recorder
that
is
connected
to
the TAPE MONITOR 2
IN
and
OUT Jacks,
be
sure
the SELECTOR Switch
is
not
in the TAPE 2 position.
For Recorders
with
Three
Heads
1.
Thread a blank tape
onto
your recorder (or
insert a cassette).
2.
Put the 4300's
DOLBY
Switch in the
"PLA
Y"
position.
3.
Put both the
43OO's
and
the recorder's moni-
tor
Switches in the
"Tape"
position.
4. Put the 400Hz TONE Switch in the
"ON"
(in) position.
5.
Commence recording.
6.
Adjust the recorder's record level controls
so
the tone
will
deflect the
43OO's
SIGNAL·
STRENGTH Meter
to
the
"DOLBY
LEVEL"
mark.
7.
Switch
off
the 400Hz TONE Switch.
8.
Dynamic monitoring will
be
acheived when
the
43OO's
MONITOR Switch
is
in the
TAPE 1
or
TAPE
2.
For Recorders
with
Two
Heads
1.
Thread a blank tape
onto
your recorder (or
insert a cassette).
2.
Put the 4300's
DOLBY
Switch in the
"OFF"
position.
3.
Put the 400Hz TONE Switch in the
"ON"
(in) position.
15
4. Commence recording.
5.
Adjust the recorder's record level controls
to
deflect the recorder's meters
to
OVU.
6.
Record the tone
for
approximately 30
sec-
onds.
7.
Stop the recorder and rewind
it
to
the begin-
ning
of
the tone recording.
Switch
off
the
400
Hz TON E .
8. Put the
43OO's
DOLBY
Switch in the
"PLA
Y"
position.
9.
Put the recorder in the play mode
and
play
back the tape.
1
O.
Note the level reading on the 4300's SIG-
NAL-STRENGTH Meter.
To
check the
left
channel level,
put
the METER Switch in the
"OUT"
position.
To
check the right chan-
nel
level,
put
the METER Switch in the
"1
N"
position. The object
is
to
adjust the
recorder's record level controls
so
the play-
back level achieved indicates
"DOLBY
LEV-
EL"
on the
43OO's
SIGNAL-STRENGTH
Meter.
11.
If
the Meter indicates
"DOLBY
LEVEL",
calibration
is
completed.
12.
A)
If
the Meter indication
is
above the
"DOLBY
LEVEL",
repeat steps 2 - 11,
but
decrease
the record level in step 5
to
sl
ightly below
OVU
on the recorder's
VU
Meters.
B)
If
the Meter indication
is
below the
"DOLBY
LEVEL",
repeat steps 2 - 11,
but
increase the record level in step 5
to
slightly above
OVU
on the recorder's
VU Meters.
For all Recorders
After
the
"DOLBY
LEVEL"
has
been
achieved
on the SIGNAL-STRENGTH Meter,
DO
NOT
change the recorder's
input
or
output
level con-
trols
or
the 4300's
PLAY
CAL
controls.
Utilizing the recorder's
VLI
Meters, proper Dolby
recording
levels
are
adjustable
by
using the R
E-
CORD
LEVEL
controls on the
front
panel
of
the
4300. This only applies when making a Dolby
recording.
CHANGING THE RECORDER'S RECORD
OR
PLAYBACK
LEVELS
OR
THE 4300's
PLAY
CAL
CONTROLS
WILL
AFFECT
THE
DOLBY
CALIBRATION.
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