Marantz SD555 - Page 8

5.
Adjusting
the
Recording
Section
.
(1)
Adjusting
the
record/playback
overall
frequency
response.
~
(High)
1) Load the test tape AC-514, record a signal with an input
level of —40 dB. 1 kHz at the LINE IN terminal; playback this
recording.
2) Change the frequency of the input signal to 10 kHz, record
and playback; adjust RT-105 (L ch), RT-205 (R ch) so that
the characteristic standards meet the following diagram
when compared to the 1 kHz signal output level.
(The other TAPE POSITIONS will automatically be adjusted
by finishing of the foregoing adjustments.)
Dolby C Record/Playback Overall Frequency Response
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(db)
Ce eden ae
5k 10k 14k 20k (Hz)
Tape :AC-514
DolbyNR =: OnC
Level : ~20dB From Dolby Level
(2)
Adjusting
the
record/playback
levels
(High)
(3)
Checking
the
Dolby
C
record/playback
overall
frequency
re-
1) Load a AC-514 tape and after having recorded a signal of sponse
‘1
kHz
(—20
dB),
play
it
back.
1)
Set
the
DOLBY
NR
switch
to
the
“C”
position.
2)
Adjust
RT-103
(L
ch)
and
RT-203
(R
ch)
so
that
the
output
2)
Using
the
test
tapes
AC-514,
perform
record/playback
in
from the line out terminal has the same value as the output the same manner as 5-(1).
when
monitoring
the
recording.
3)
Check
to
make
sure
that
the
record/playback
overall
fre-
quency response meets the specifications in the diagram.
Record /Playback Overall Frequency Response
sn dees naar incsnser sneha Asha isos nt
20
50
100
200
500
1k
2k
5k
10k
14k
=
20k
(Hz)
a,
Tape
:AC514
a)
DelbyNR
—-:
OFF
-
Level
+
—20dB
From
Dolby
Level
PCS 87 614 6