Kenwood KAC-X542 Service Manual

Also see for KAC-X542 - eXcelon Amplifier: Instruction manual

KAC-X5427CIRCUIT DESCRIPTIONAD-I(2/2)IC6(1/2)IC6AMP RECTMPU AD-PORTOUTPUTVOLTAGEDETECTIONLEVEL10u352701K10K7 5615K0.01 0.0110K181K6832220L54+10K10KJ3Q95Q96Q93Q90to Head unitHead unit GNDCONSTANTCURRENT AMPGNDfromMPU34 2 1117812610591347 47REQCHead unit-GND100K12K1.5K1.5K20KIC9J4 D93D91to OTHER AMPRECEIVETRANSMISSONto MPUTRANSMISSONRECEIVEBOTH DIRECTIONBUFFER42314.3K4.3K2702709571011 8610u2510K1.8K1.8KVCCSXGNDRXTXTYSYRY 67853214CLKDATANo. Item Alignment Point Method Align For Note Fig.Connect a DC voltmeter betweenVR5 (A-Lch) the following emitter resistors. PC BOARD1 IDEL CURRENT VR6 (A-Rch) R347 (A-Lch) 2.5mV Over 2 minutes on page 10VR7 (B-Lch) R348 (A-Rch) aging is required. and 11.VR8 (B-Rch) R447 (B-Lch)R446 (B-Rch)ADJUSTMENT● Current detection circuitAmplify and rectify potential differences attwo points in the primary-side current circuitand send it to the AD-port of the MPU andobtain data for displaying current value.● Constant current output circuitRemove troubles caused by the potentialdifferences between the constant currentoutput and the GND, so that the GND po-tential differences between the head unitand the AMP is not overlapped in the AMPto head unit communication.● I2C bufferUsing an IC for I2C communication, be-tween-AMP communication is conducted sothat there will be no trouble from GND po-tential differences.