Kenwood KAC-8103D - Amplifier, Service Manual

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KAC-8103D
2
BLOCK DIAGRAM
LINE IN
LINE OUT
R
L
(0.2-5V)
R
L
ISO-AMP
IC11
L
R
R
L
SP INPUT
25Hz
15Hz
IC14
I.F.S
S3
I.S.F
SEL.
VOL
SENS.
VR1
(50-200Hz)
FREQ
IC18
L.P.F
VR2
BASS
BOOST
0-18dB
VR3
LEVEL
FREQ=40Hz
IC15
Q151
ATT MUTE
Q603
Q1-3
Q400,403
Q25,26,28,42
15V
NF
AVR
B
+HB
AVR
Q416
OVERLOAD
D-AMP
ON/OFF
Q604-607
DET
IC32 (2/2)
TRIANGLE
SUMMING
WAVE
IC32 (1/2)
AMP
IC31
COMP
IC12,13
TIME
DEAD
404,417
LEVEL
SHIFT
GND
BATT.
LC FILTER
DC-OFFSET
CON
DC/DC
ON/OFF
POWER
IC1
THERMAL
IC60
DET DET
Q608-611
POWER
INDI.
P-CON
300W / 4
500W / 2
MOS-FET
Q410-413
DRIVE
FINAL
LC FILTER
Q401,402, Q405-409,
414,415
SP
OUTPUT
RESONANCE
DET
IC61,64
IC62,63
COMPONENTS DESCRIPTION
●
AUDIO UNIT (X09-8600-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 DC/DC converter IC Generates drive signal for switching element.
IC11 Isolation amp. Isolates noises caused by potential differences in GND.
IC12,13 (2/4) NAND Generates and shapes the inverted waveform and to create dead time in Dclass section.
IC13 (1/4) (4/4) Pulse conversion circuit Converts pulse width from 1 mm to 10 mm.
IC14 INFRA SONIC FILTER Cuts off ultra low frequency of an audio signal.
IC15 BASS BOOST Bass boost (Variable level)
IC18 LOW PASS FILTER Cuts off high frequency of an audio signal.
IC31 Comparator Digitalizes by comparing analog signal with triangular waves.
IC31,32 (1/2) Triangular wave generation Generates reference signals for digitalizing analog signals.
IC32 (2/2) Error amplifier Compensates for errors by feedback from the output.
IC60
Attenuation circuit to attenuate
Attenuates output when temperature in the set becomes too high.
input signal by 1.5dB
IC61,62,64
Comparator in resonance Detects short SP output circuit, measures overcurrent in the circuit, activates
detection circuit protection operation.
IC63 (1/2) Comparator circuit Turns off DC/DC power supply when an error is detected.
IC63 (2/2) Comparator circuit Turns off Dclass amplifier when an error is detected.
Q1~3 PCON switch Turns on the circuit when ON signal is applied to the PCON circuit.
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