Kenwood KAC 8103 D Service Manual

Page 1

WEE-R81 030 KENWOOD

Kenwood Corporation
SERVICE MANUAL

© 2006-11 PRINTED IN JAPAN
853-0473-00 (N) 955

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This product uses Lead Free widen.

This product complies with the RoHS direciive for the European marker.

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KAC-8103D

LINE IN
(0.2-5V)

UNEOUT

SP INPUT
1-1

1.
O

BLOCK DIAGRAM

Ic15
|C11 VR1 1010 FREO:40HZ
R0 1 1" ISOVAMPI
FREQ LEVEL
L @k # (5072mm) 4' 0710115
VR2 vna
0151 cam
R
L N ' 0401 402, 04057400. 1
L , 1032 (22) 1c31 1c12,13 404,417 414,415 1 04107413
R _ o_.._I
SUMMING DEAD LEVEL I FINAL SP
R+O-«- AMP H COMP H TIME SHIFT H DH'VE 7" 'lMOSrFET LC FILTER OUTPUT
I 1 Q
TRIANGLE ' 0400.403 1
WAVE DAMP 1 V
ON/OFF 1
1 POWER
1062.63 1 1-4 NDL
ICEI164 06047607| lcso 1 06087611
1 - - -o PVCON
RESONANCE OVERLOAD THERMAL DCVOFFSET 1
DET DET DET DET 1
I I 7
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Q25,26,28,42 1 1
:15v : \-
AVR

COMPONENTS DESCRIPTION

0 AUDIO UNIT (X09-8600-10)

Ref. No. Application / Function Operation / Condition / Compatibility
IC1 DC/DC converter IC Generates drive signal for switching element.
|C11 Isolation amp. Isolates noises caused by potential dillerences in GND.
|C12,13 (2/4) NAND Generates and shapes the inverted waveform and to create dead time In Dclass section.
|C13 (1/4) (4/4) Pulse conversion circuit Converts pulse width from 1 mm to 10 mm.
|C14 INFFIA SONIC FILTER Cuts off ultra low frequency of an audio signal.
|C15 BASS BOOST Bass boost (Variable level)
|C18 LOW PASS FILTER Cuts off high frequency of an audio signal.
IC31 Comparator Digitalizes by comparing analog signal with triangular waves.
IC31132 (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.
Attenuation circuit to attenuate
ICGO Attenuates output when temperature in the set becomes too high.
input signal by 1.5dB
Comparator in resonance Detects short SP output circuit, measures overcurrent in the circuit, activates
$61,621 detection circuit protection operation.
ICG3 (1/2) Comparator circuit Turns olf DC/DC power supply when an error is detected.
|(363 (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.