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5. When a certain type of tape does not meet
with the standards specified in section 4, con-
firm that the adjustments are within the stand-
ards of
recording and playback frequency
response adjustment with the Dolby NR switch
on, and then adjust VR205 (Lch) and VR206
so that the value in section 3 is within the range
o f - 2 . 5 t 0 . 5 d B ( 8 0 0 - 7 1 0 m V ) .
9 . 1 2 O U T P U T L E V E L A D J U S T M E N T
1. Connect millivoltmeters to the mother ass'y
TP terminals No.26 (L-ch) and No.25 (R-ch),
and tum VRror and VRroe down to minimum
positions.
2. Apply the 333H2 signal to the mother ass'y TP
terminals No.16 (left) and No.15 (right), and
adjust the INPUT level controls so that the
millivoltmeters read - SdBv ( 700mV).
3. Set the OUTPUT level controls to the center
click-stop positions, and connect millivoltmeters
to the OUTPUT terminals.
Adjust VRror
(left) and VRroa (right) so as to obtain meter
readings of -7dBv ( 46mV).
9 . 1 3 R E C O R D I N G D O L B Y N R A D J U S T M E N T
1. Connect up the millivoltmeter to TP terminals
No.29 (left) and No.30 (right) on the mother
ass'y.
2. Apply a -10dBv (316mV) lkHz signal to the
INPUT terminals.
3. Put the DOLBY NR switch off, and then adjust
the INPUT potentiometer so that the indication
on the millivoltmeter becomes OdBv (1V).
4. Next, set the level of the input signal of
Paragraph 2 above, to -50dBv (3.16mV).
5. Put the DOLBY NR switch on. Adjust VRzor
(left) and VRzoz (right) so that the millivolt-
meter indication becomes -34dBv (19.9mV).
9.14 PLAYBACK DOLBY NR ADJUSTMENT
1. Connect the millivoltmeter to terminals No.25
(left) and No.26 (right) on the mother ass'y.
2. Put VRro: and VRroc in the minimum settings.
3. Apply a lkHz
signal to TP terminals No.15
(left) and No. 16 (right) on the mother ass'y.
Adjust the input level so that the millivoltmeter
indication becomes 0dBv (1V).
4. Next, apply an input which is 34dB below that
of paragraph 3 above.
5. Put the DOLBY NR switch on. Adjust VRroo
: L-ch and VRros : R-ch. so that the indication
on the millivoltmeter becomes -40dBv (1mV).
a
r \
l l C a m p l i f i e r
U
I
a s e m b l y ( L c h )
L . o , L . -
1 . .
L . -
@ @
@ @
r'6dô"^"-flI?P'Bi-
e æ /,6i1 !,* u,l' " " gZr, d,"Y,t^
(
Fig. 9-7
Adjustment points
36
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