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A-711/711L
CIRCUIT DESCRIPTION
N.B. CIRCUIT (X09-3142-71
(B/5)) :
The N.B. of N.B. CIRCUIT stands for Natural Bass, and it is the
circuit to create further natural bass sound.
It is roughly composed of () Variable loudness control and @
Main amplifier bass emphasizing circuit showed in the chart.
The @ Variable loudness control in the chart has become able
to vary the level of loudness control by mounting the tradition-
al loudness control variable VR (VR2,1/4) onto itself.
The @ main amplifier bass emphasizing circuit can boost up
the desired frequency with the fixed number of C.R. parts for
input and returning C.R. parts of main amplifier. It has also be-
come able to vary these boost levels by mounting VR2,(3/4)
onto it. The fixed number of this A-711/711L has been set so
as to boost up 60 Hz.
IC5: CXP50112-1270
(X05-3992-71)
TUNER microprocessor
Terminal connection diagram & key matrix connection
KEY
MATRIX
i}
fed fee fT
PRO-
KR3
ee
awe
6 O—
O ae ww er
DIODE
64
—of>po—
1C5(X05)
8-BT-98GK
FL1(X08)
BACK
UP
GAPASITOR
5.6V
18
CXP50112-127Q
The action of this circuit results from the combination of afore-
mentioned @) and @), which also can vary the boost level of
bass sound at the same time.
MASTER
VOL.
MAIN AMP.
INPUT
OUTPUT
Zz
¢VR2-(3/4}
Af
VR2-(1/4)
~
lL. — BASS CONT. VOL.
@ Variable loud-
ness control
@ Main amplifier bass emphasizing circuit
DATA(SYSTEM CONTROL)
BUSY (SYSTEM
CONTROL)
il
STEREO
«|
apere
} from XO5
MONO
TO X05
1C3 LM7001(X05)
| L__
cE
DATA
PLL IC
CLK
TMUTE
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