Kenwood KR-4070 Service Manual page 10

KR-A070
10
CIRCUIT DESCRIPTION
@EQ(XO5- 1470-10)
TO hae:
EL
gt
The block diagram shown above represents the audio
section of KR-4070.
The equalizer circuit consisting of TA-7136P(IC) is mounted
on the tuner circuit board.
Signals from phono cartridge are fed to Pin 2 of TA-7136P,
amplified and delivered as output signals from Pin 6. The
Output signais are partly applied to the equalizer element
(RIAA curve) and fed back to the input of TA-7136P.
The amplified signals are fed to the power amplifier through
the selector SW, tape monitor SW, volume contro! and
balance control. The power amplifier comprises a 2-stage
transistor differential amplifier and a complementary
amplifier with ASO protection circuit that protects the power
transistors from overload. An NFB type tone control circuit is
included in the NF circuit of the power amplifier.
POWER, TONE (X09- 1220-10)
[VOLUME BALANCE TONE) 7
VRmi VRm2 x mays
OdB= 1V
Freq: 1kHz
Reference value
17.9V/8Q
Fig. 6
~
"
TA-7136P
a
p34
- 4