KENWOOD KAC-6403
Manual de Servicio

KAC-6403
BLOCK DIAGRAM
AUDIO UNIT (X09-8542-70)
J1 L LINE IN A IC2 R ISOLATION AMPLIFIER IC2 ISOLATION AMPLIFIER VR1 IC9 +1 Ach INPUT GAIN CONT. C151,153,R165,167 HPF 80Hz 12dB/OCT IC7 S2 Q101,102, 201,202 Q103-114, 119-126 POWER AMPLIFIER Q103-114, 119-126 POWER AMPLIFIER MUTE IC4 L LINE IN B IC4 R ISOLATION AMPLIFIER S1 ISOLATION AMPLIFIER S1 VR2 S3 Bch INPUT GAIN CONT. S3 IC5 LPF+10dB 80Hz 12dB/OCT S3 IC6 +1 -3dB ATT IC5 S3 -1 -3dB ATT A-AB J2 Q3,4 15V AVR L2 DC/DC CONVERTER Q605 P.CON CIRCUIT TH1 THERMAL PROTECTION +6dB 0dB IC13 OVER VOLTAGE PROTECTION +29.5dB BATTERY P.CON Q115-118,215-218 DC DETECT & OVER ROAD PROTECTION Q203-214, 219-226 POWER AMPLIFIER Q203-214, 219-226 POWER AMPLIFIER L SPEAKER OUT B R J9 L SPEAKER OUT A R

+1 -3dB ATT IC7

IC9 -1

C152,154,R166,168 HPF 80Hz 12dB/OCT

S2

+1 -3dB ATT

SPEAKER INPUT

COMPONENTS DESCRIPTION
� AUDIO UNIT (X09-8542-70)
Ref. No IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC9 IC13 Q3,4 Q5,6 Q7~10 Application / Function Buffer AMP Isolation AMP Buffer AMP Isolation AMP LPF -3dB ATT Buffer AMP Phase inverter DC/DC converter Constant voltage power supply DC/DC converter DC/DC converter Operation / Condition / Compatibility Amplifies 6dB by decreasing impedance. Decreases common mode noise. Amplifies 6dB by decreasing impedance. Decreases common mode noise. B-Rch side is phase inverter. B-Lch side is buffer amplifier. Decreases impedance. A-Lch side is buffer amplifier. Oscillates and controls DC/DC converter. Controls ±15V constant voltage. Switching FET. Drives Q5�s and Q6�s gates.

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