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=
® Connection Diagram (shown in Fig. 32)
© To Adjust
=
* Connection Diagram
Oscillator
AMP_
UNIT
AC mV Meter
ot
RBI
Attenuator
TPI
lOpié6v
amt
+
lI ©O0®
® To Adjust
1. Insert a blank cassette tape, and play it.
2. Set the Dolby NR switch to ON and apply a 5 kHz input
frequency signal from the oscillator. Adjust the attenuator
so that mV meter pointer deflects to 58.7 mV (—22.4 dBs).
3. Now set the Dolby NR switch to OFF and adjust VR3 so
that mV meter pointer deflects to 23.4 mV (—30.4 dBs).
3.14 DOLBY NR LEVEL ADJUSTMENT
Fig. 33
® Connection Diagram (shown in Fig. 33)
© To Adjust
1. Disconnect oscillator and attenuator from TP1.
2. Play back the CT-150 (400 Hz-200 nwb/m) test tape and
adjust VR1 (Lch) and VR2 (Rch) so that the mV meter
pointer deflects to 775 mV (0 dBs).
25
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2SB562
2SD655
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2SC2458
2SC24581
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2SC2021
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CIRCUIT
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INPUT
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[GATE
FYST GATE
IN PUT! (1/0)
GATE LATCH
IN PUT!
gare | PFIOP
iN PUT) (1/0)
kL
1 LATCH
CLK
OSC
GATE PULSE
SBIT BINARY
Ul
COUNTER
TIMING
LATCH
26
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