12
DN-780R
5. Recording System Adjustment
5-1. Adjusting recording/playback comprehensive
frequency characteristics.
(1) Load a test tape TDK AC-514.
Record with a -20 dB 1 kHz input level signal into
the LINE IN terminal and playback.
(2) Make a sample recording using a 12 kHz input
signal and playback this recording. Adjust (left
channel) and (right channel) so that they conform
to the following specified characteristics.
(db)
+
6
+
5
+
4
+
3
+
2
+
1
0
−
1
−
2
−
3
−
4
−
5
−
6
20
100
50
200
500
1 k
2 k
5 k
10 k
12 k 20 k (Hz)
Tape
Dolby NR
Level
: AC-514
: Off
:
−
20 dB From Dolby Level
5-2. Recording/Playback Level Adjustment
(1) Load the test tape TDK AC-514. Make a sample
recording with the 1 kHz (-20 dB) signal and play
this section back.
(2) Adjust (Lch) and (Rch) so that the output from
LINE OUT terminal is the same as the output at
recording monitoring time.
5-3. Dolby C recording and playback comprehensive
frequency characteristics verification
(1) Set the Dolby NR switch at "C" position.
(2) Use a test tape TDK AC-514 and record and
playback as in item 5-1 to verity that they satisfy
the characteristics standards.
(db)
+
6
+
5
+
4
+
3
+
2
+
1
0
−
1
−
2
−
3
−
4
−
5
−
6
20
100
50
200
500
1 k
2 k
5 k
10 k
12 k 20 k (Hz)
Tape
Dolby NR
Level
: AC-514
: On C
:
−
20 dB From Dolby Level
Record/Playback Overall Frequency Response
ATT
LINE IN
LINE OUT
V.V
REC Amp
PB Amp
Dolby C Record/Playback Overall Frequency Response
DECK
L/R
L
VR-105
VR-106
VR-405
VR-406
R
R
L
Adjusting volume number
Frequency Responce
A
B
DECK
L/R
L VR-103
VR-104
VR-403
VR-404
R
R
L
Adjusting volume number
R/P Level Adjustment
A
B
