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12.2.1
Settings
AC mV
DOLBY NR Level Adjustment
meter
.. Connect to DOL L (L ch)
and DOL R (R ch)
Input signal
Tape selector . .
Mode
2kHz, - 10dBv (316mV) to
LINE INPUT
NORM
Record
?NAZ
- l & 8 v
( 3 r t u v )
I
-3ftav
( 3 1 6 n v )
Fig. 12-6 DOLBY NR level adjustment
Procedure
1. A<ijust the INPUT level control so that the AC
mV meter reads - 2.2dBv (776mV).
2. Drop the input signal level to - 30dBv by
attenuator, and switch the Dolby NR switch
oN.
3. Adjust VR401 so that the meter reads - 17.9
dBv (127mV).
12.2.2 Head Azimuth Adjustment
Settings
AC mV meter
. . Connect to OUTPUT
terminals
Test tape
STD-341A
(10kHz, - 20dB)
T a p e s e l e c t o r . .
N O R M
Mode
. .. Playback
VR101 and VR201 . . .Turn clo.ckwise to maxi-
mum posrlron
_pr
Erase head
R E C / P B h e a d
Fig. 12-8 Head azimuth adjustment
Procedure
Adjust the azimuth adjustment screw for maxi-
mum AC mV meter reading. (Lock the screws with
screw lock after completing the adjustment).
12.2.3
Playback Level Adjustment
Since this adjustment determines the DOLBY
NR level during playback, it should be performed
precisely.
Settings
AC mV meter
. . Connect to DOL L (Lch)
and DOL R (R ch)
Test tape
STD-341A (333H2, OdB)
T a p e s e l e c t o r . .
N O R M
Mode
. .. Playback
J3
D (
D(
-l
I
^
@
1 . 2 d B v ( 0 . 8 7 V )
Fig. 12-9 Playback level adjustment
Procedure
Adjust VR10L (L ch) and VR201 (R ch) so that
the meter reads - 1.2dBv (0.87V).
Head azimuth adjustment screw
D O L L ( L c h )
D O L R ( R c h )
Fig. 12-7
Head azimuth adjustment
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