Kenwood KAC-8104D Service Manual

Also see for KAC-8104D - Amplifier: Training guide Product information Instruction manual Instruction manual Service manual

Contents

3KAC-8104DCOMPONENTS DESCRIPTION● AUDIO UNIT (X09-8730-10)Ref. No. Application / Function Operation / Condition / CompatibilityIC1 DC/DC converter IC Generates drive signal for switching componentIC11 Isolation amplifi er Isolates noises caused by potential differences in GNDIC12,13 NAND Generates and shapes the inverted waveform and to create dead timein D-class sectionIC14 INFRA SONIC FILTER Cuts off ultra low frequency of audio signalIC15 BASS BOOST Bass boost (Variable level)IC18 LOW PASS FILTER Cuts off high frequency of audio signalIC31 (1/2) Triangular wave generation Generates reference signal for digitalizing analog signalIC31 (2/2) Comparator Digitalizes by comparing analog signal with triangular wavesIC32 (1/2) Triangular wave generation Generates reference signal for digitalizing analog signalIC32 (2/2) Error amplifi er Compensates errors by feedback from the outputIC60 Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too highIC61,62,64 Resonance detecting circuit Detects short in SP output circuit, measures over current in the circuit,and activates protection operationIC63 Comparator Controls D/D CON and D-class On/Off with the over current detectionand Pcon control signalsQ1-3 PCON switch Turns on the circuit when ON signal is applied to the PCON circuitQ4,5 Mute Generates mute drive signal and turns off LEDQ6 DC/DC converter ON/OFF control Turns off DC/DC converter when protection is detectedQ8-11 Gate driver Gate driver in DC/DC converter FETQ12,13,19,20 DC/DC converter DC/DC converter switchingQ25,26,28,42 AVR ±15V AVRQ29,30 Tracking when ±15V AVR is turned OFF Matches the trailing edge of “-15V” AVR with that of “+15V” AVRQ37,38 DC/DC converter pulse ON/OFF control ON or OFF of DC/DC converter drive waveformQ51,52 AUTO Pcon Sends DC voltage from SP IN to Pcon control circuitQ151 Mute Turns off audio signalQ400,403 D-class amplifi er switch Turns on or off D-class amplifi erQ401,402Q404-409,414Q415,417Pulse amplifi cation, shaping and level shift Generates the signal that drives the D-class fi nal FETQ410-413 Power amplifi cation High-current switching in D-classQ416 HB 15V AVR Stacking AVR to obtain High+B for D-classQ600,601 Resonance detecting circuit Detects short in SP output circuit, measures over current in the circuit,and activates protection operationQ602,612 Protection Turns off DC/DC converter when protection is detectedQ603 Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too highQ604-607 Current-voltage conversion Converts current to voltage to detect over current and sends it to thecomparatorQ608-611 Latch circuit Detects over voltage in output and retains the currentQ900 FAN drive Limit FAN power supply voltage under the rated voltagewww . xiaoyu163. comQQ 376315150 992894298TEL 13942296513 992894298051513673QQTEL 13942296513 QQ 376315150 892498299TEL 13942296513 QQ 376315150 892498299