Kenwood KAC-210D Service Manual

Contents

KAC-210D/210MR3COMPONENTS DESCRIPTION● AUDIO UNIT (X09-5800-xx)Ref No. Application / Functions Operation / Condition / CompatibilityIC1 Line input isolation amp 9V AVR operation (center voltage 4.9V)IC2 Speaker input isolation amp 9V AVR operation (center voltage 4.9V)IC3 LPF frequency selector Select for 50, 80, 100, 150Hz (Default 150Hz)IC4 Volume control Electric volume (VCA)IC5 LPF, phase selector LPF (-12db/oct.) Phase 0°/180°IC6 1/2 VCC output OP amp Center voltage 4.9VIC101 Chopping wave generator & protection control Clock 140kHz, protection time (2sec for Power on)IC103 Power amp first stage, NF circuit 9V AVR operation (center voltage 4.9V)IC201 D class amp driver PWM digital converter, FET driver ICIC202 Clipper circuit 9V AVR operation (center voltage 4.9V)Q1 Phase selector Switching for phase 0°and 180°Q101~104 Power FET D class AMP final FETQ105 9V AVR Use for OP ampQ107,108 P-CON control When P-CON line more than 8.7V, this circuit is active (ON)Q109 Over load voltage detector When ACC line more than 18.2V, this circuit is active (OFF)Q110 Muting transistor Muting for PWM driver when Power is onQ111,112 Protection detector Feed back for protection data (latch operation)Q113 DC protection detector DC voltage sensibility is ±5VQ114 LED control LED light up when Power is ONQ115 LED control LED light off when protection circuit ONQ116 12V AVR control 12V AVR feedback transistorQ118 Temperature & voltage detector Protection functionQ119 Power supply voltage detector Detect for Power off conditionQ120 Discharge transistor (for C148 when Power is off) Malfunction for LED light up