Block Diagram; Components Description - Kenwood kac-8103d Service Manual

KAC-8103D
L
R
L
R
L
L
R
R
AUDIO UNIT (X09-8600-10)
Ref. No. Application / Function
IC1 DC/DC converter IC
IC11 Isolation amp.
IC12,13 (2/4) NAND
IC13 (1/4) (4/4) Pulse conversion circuit
IC14 INFRA SONIC FILTER
IC15 BASS BOOST
IC18 LOW PASS FILTER
IC31 Comparator
IC31,32 (1/2) Triangular wave generation
IC32 (2/2) Error amplifier
Attenuation circuit to attenuate
IC60
input signal by 1.5dB
Comparator in resonance
IC61,62,64
detection circuit
IC63 (1/2) Comparator circuit
IC63 (2/2) Comparator circuit
Q1~3 PCON switch
2

BLOCK DIAGRAM

IC14
IC11
I.F.S
S3
ISO-AMP 15Hz
I.S.F
25Hz
SEL.
IC32 (2/2) IC31
SUMMING
COMP
AMP
IC32 (1/2)
TRIANGLE
WAVE
NF
IC61,64
RESONANCE
DET
Q25,26,28,42
15V
AVR

COMPONENTS DESCRIPTION

Generates drive signal for switching element.
Isolates noises caused by potential differences in GND.
Generates and shapes the inverted waveform and to create dead time in Dclass section.
Converts pulse width from 1 mm to 10 mm.
Cuts off ultra low frequency of an audio signal.
Bass boost (Variable level)
Cuts off high frequency of an audio signal.
Digitalizes by comparing analog signal with triangular waves.
Generates reference signals for digitalizing analog signals.
Compensates for errors by feedback from the output.
Attenuates output when temperature in the set becomes too high.
Detects short SP output circuit, measures overcurrent in the circuit, activates
protection operation.
Turns off DC/DC power supply when an error is detected.
Turns off Dclass amplifier when an error is detected.
Turns on the circuit when ON signal is applied to the PCON circuit.
IC15
VR1 IC18 FREQ=40Hz
BASS
L.P.F
BOOST
SENS.
FREQ LEVEL
VOL
(50-200Hz) 0-18dB
VR2 VR3
Q151 Q603
MUTE ATT
Q401,402, Q405-409,
IC12,13 404,417 414,415 Q410-413
DEAD LEVEL FINAL
DRIVE
TIME SHIFT MOS-FET
Q400,403
D-AMP
ON/OFF
IC62,63
Q604-607 IC60
OVERLOAD THERMAL
DET DET
Q416
+HB
B
AVR
IC1
DC/DC
CON
Q1-3
POWER
ON/OFF
Operation / Condition / Compatibility
SP
LC FILTER
OUTPUT
300W / 4
500W / 2
POWER
INDI.
Q608-611
P-CON
DC-OFFSET
DET
BATT.
LC FILTER GND