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12.2.6 Record Level Adjustment
Since this adjustment determinet thG DOLBY NR
leuel during reocrding, it should be performed preciæly.
Setting
M o d e
. . . .
R e c o r d
Test Tape
. STD-608A, STD-608,
STD.604
AC mV meter
. . . Tpl
(L ch)
and
Tpz
(R ch) of the mother
assembly
I n p u t S i g n a l
. . . .
B g g H z , - 1 0 d B v ( B 1 6 m V )
rNpur lever conho, . . . 3ir"ÏNx
INPUr
Procedure
1. Ctreck that the AC mV meter reads -b.2dBv
t4dB (870mV - BbOmV ) and adjust the input
signal level with attenuator so that the AC mV
meter reads :5.2dBv (0.iaV).
2. Next set ttre DOLBy NR switch to the ON
position.
3. Record the BBBHz signal onto the STD-60SA.
eUy
!_1c!r-the tape and adjusr rhe V8102 (Lch)
and- VR202 (Rch) so that the AC mV
metei
reads -5.2dBv (0.bV).
Record the 333H2 signal onto the STD-609.
PIay back the tape and check that the AC
mV meter reads -5.2dBv t1.5dB (650mV -
460mV).
Record the 333H2 signal onto the STD-604.
Play back the tape and check that the AC mV
meter reads -5.2dBv
t1.5dB
(6b0mV -
460mV).
ADJ.POINT
4 .
o .
12.2.6 Record level
A D J .
V R 1 0 2 ( L c h ) ,
V R 2 0 2 ( R c h l
Fig. 12-16 Record level adjustment
T P 2 - p
g - - v R r o l
Q-vR203
@ - V R t 0 3
q
I
vR202
Fig.12-tl ADJ. point
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