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M o d e
. . . R e c o r d
t d 8
12.2.6 Record/Playback Frequency Response
Adjustment
Settings
AC mV meter
Input signal
Test tape
Tape selector . .
Connect to OUTPUT ter-
minals
333H2, -30dBv (31.6mV)
to LINE INPUT terminals
STD-608A (STD-603,
sTD-604)
NORM
(CrO2, METAL)
o
3 3 3 H 2
3ftBv
{ 3 l . 6 m V
6 3 k H z
3ftav
( 3 l . 6 m V )
o
B
3 k B z r e v e l 3 3 3 H 2 r e v e r
+ 0 5 d B
Fig. 12-12 Record/playback frequency response adjustment
Procedure
1.
Adjust
the INPUT
level control
so that the
meter reads 27dBv (44.6mV).
Record the 333H2, - 30dBv and 6.3kHz,
- 30dBv signals, and adjust VR301 (L ch) and
VR302 (R ch) so that the difference in the
playback output signal level with the 333H2
level as the reference level is +0.5dB.
Change the tape selector and DOLBY NR
switch positions (See Fig. L2-L3,14), and check
that the frequency response is satisfactory.
Playback Frequency Response
Test tape
STD-341A
T a p e s e l e c t o r . . . . . . .
N O R M
DolbyNR switch . . . . .OFF
NOTE:
Due to "edge effect",
compensate the right channel by
-O.idB at 125H2 and - ldB at 63H2.
-T
5 d a
3 d 8
_-_.lL
6 . l k H r
l O t H .
Overall Frequency Response
Testtape
.. STD-608A
Tapeselector ...
. NORM
D O L B Y N R s w i t c h
. . . . .
O F F
3 3 3 H !
6 3 H !
6 . 3 k H !
1 2 k H r
Testtape
.. STD-608A
Tapeselector ..
.. NORM
D O L B Y N R s w i t c h
. . . . .
O N
r 2 5 H t
4 l H r
Testtape
.. STD-603
T a p e s e l e c t o r . .
. . C r O 2
D O L B Y N R s w i t c h
. . . . .
O F F
3 3 3 H z
F i g . 1 2 - 1 3 F r e q u e n c y r e s p o n s e
3 3 3 H r
2 .
3 .
\ /
| 0 "
5 d 8
? d a
4 d l
v
35
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