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Marantz SD1000 - Electrical Adjustments (Continued); Record-Playback Frequency Response; 19 kHz Filter Adjustment Guide

Marantz SD1000
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6.8
RECORD-PLAYBACK
FREQUENCY
RESPONSE
ADJUSTMENT
SET
UP
1.
Power
voltage:-
50
or
60
Hz
AC
voltage
rated
for
the
unit
to
be
used
in
a
market
country.
.
Input
signal:-
1
kHz,
—60
dB
with
—20
dB
referenc-
ed
as
O
dB.
.
TAPE
SELECTOR
switch:-
NORMAL.
.
Output
terminal:-
LINE
OUTPUT.
.
Load:-
Measuring
instrument
input
impedance.
.
Playback
output
level:-
43
mV
(same
as
recorded
signal
level).
.
Test
tape
used:-
TDK
AC-211.
.
Tape
Speed:-
1-7/8
IPS.
PROCEDURES
.
Connect
the
input
signal
to
the
MIC
terminal.
Set
up
the
tape
deck
to
the
normal
recording
state.
.
In
turn,
reduce
the
input
level
by
20
dB
with
the
use
of
the
attenuator.
Record
the
1
kHz
and
12.5
kHz
tones.
.
Play
the
1kHz,
20dB-down
recorded
tone
back
as
OdB.
Adjust
the
recording
bias
current
until
the
12.5
kHz
response
is
within
+1
dB
as
referenced
to
the
1
kHz,
0
dB
response.
1.
Proceed
both
for
the
right
and
left
chan-
nels
in
the
same
manner.
2.
If
the
recording
bias
current
is
reduced
in
the
above
adjustment,
be
sure
to
measure
the
distortion,
NOTES:
Mode:
Record
AF
OSC
TONE:
1
kHz,
—60
dB,
—80
dB
ATTENUATOR
RECORDED
;
PORTION
LINE
OUTPUT
13
6.9
19
KHz
FILTER
ADJUSTMENT
SET
UP
1.
Power
voltage:-
50
or
60 Hz
AC
voltage
rated
for
the
unit
to
be
used
in
a
market
country.
.
Input
terminal:-
MIC.
.
TAPE
SELECTOR
switch:-
NORMAL,
.
Output
terminal:-
LINE
OUTPUT.
.
Load:-
Measuring
instrument
input
impedance.
PROCEDURES
1.
Connect
the
19kHz,
—60dB
input
signal
to
the
MIC
terminal.
Adjust
the
RECORD
LEVEL
control
for
0
VU.
.
Turn
the
DOLBY
NR
pushswitch
to
the
ON
posi-
tion.
Adjust
the
L502
for
maximum
output
level
at
the
LINE
OUTPUT
terminal.
NOTE:
Proceed
both
for
the
right
and
left
channels
in
the
same
manner.
Mode:
Record
AF
OSC
TONE:
19
kHz,
Lsae
@IMPX
FILTER
aN
|
PSOO
CAUTIONS
1.
The
19
kHz
input
signal
should
be
as
precise
as
19+0.01
kHz.
2.
If
the
filter
characteristic
is
better
than
30
dB,
the
adjusting
coil
needs
not
to
be
adjusted
since
it
is
factory
set.

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