Marantz SD555 - Page 10

5. Adjusting the Recording Section
(1)
Adjusting
the
record/playback
overall
frequency
response.
4
(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
(db)
mR eae Se eee
A 21h ee ee ee ee a |_|
har ree ea
|
-6
}
-8
i
re i
i
t
4
20
50
100
200
500
ik
2k
5k
10K.
14k
=
20k
(Hz)
4
.
Tape
:
AC-514
i
Dolby
NR
:Onc
{
Level
:
—20d8
From
Dolby
Level
i
H
(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
(do)
-6
-7
-8
-9
20 50 100 200 500 1k 2k Sk 10k 14K 20k (Hz)
Tape 2 AC-514
Dolby NR : Off
Level : —20d8 From Dolby Level
PCS
87
614
6