Kenwood KAC 8151 D Service Manual

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SERVICE MANUAL

© 2003-2 PRINTED IN JAPAN
853-0040-00 (N) 3114

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KAC-8101D/8151D

BLOCK DIAGRAM

WIRED

REMOTE

CONTROL
+0/+6/+9/+12dB

INPUT BASS LOWPAss INFRASONIC
VOL BOOST FILTER FILTER EXPANDEFI
L39 5M3. _°_-2'_5£V_ _ 11.213535 F. 2039052. _ _ _O_FE/ 1535345 _ _O_N/_OEF_ _ _ _ METE
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INPUT Ik n N N I
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D CLAss AMP
715v AVR
TRIANGLE
WAVE POWER
AMP
TRANSFORMER OUTPUT
BAT-ro-rw '1 MIX -l- PWM 1r 3 ®
ESVNVERTER COMPEARATE
P. CON c AMP
+ (DEAT TIME)
GNDC I l 3 OUgUT
THERMAL OVELOAD Dc OFFSET
PROTECTION PROTECTION PROTECTION
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COMPONENTS DESCRIPTION

AUDIO UNIT (X09-5480-1 X)

Ref No. Application / Function Ref No. Application / Function
|Ct Isolation amplilier 015,16 Output FET
ICZ Bus boost amplifier 017~20 Speaker output current detection
|C3 (1/2) : Lowpass filter amplifier 021,22 Output FET control power supply and control
(2/2) : Infrasonic amplifier 023~25 DC protection
|C4 Expander amplifier 026,27 ASO DC detection
|C5 DC detection rectification amplifier 028 ICS (2/2) output logic invert
|C6 Expander detection and dilference output 031 Reduced voltage protection
(1/2) :Triangular waveform generation 032 Over voltage protection
I07 (2/2) : Summing amplifier 034 DC/DC converter power supply
ICB (1/2) :ASO (current, voltage comparison) detection 036 DC/DC converter control
(2/2) : DC converter control 037~4O Power FET driver
(1/2) :Triangular waveform generation 041~46 Power FET
I09 (2/2) : PWM waveform generator 047~50 Small-signal i power supply
|CtO,11 Dead time generator 05152 When OFF, quick break in a circuit of 9 power
|Ct2 Bus boost level changer supply for small-signal circuit
|015 DC/DC converter 053 Power FET control power supply
01 Mute 055 Mute, LED and protection control
03~5 Output FET control (current amplifier) 061 ~64 Power FET driver
07~1D Output FET control (current amplifier) 065,66 Power FET
011~14 Output FET driver