Harman Kardon AVR330 Service Manual

Also see for NOCTURNE 330: Brochure & specs Brochure & specs Reference guide Brochure Reference guide

Contents

harman/kardon TECH TIPSTroubleshooting tips and solutions to common service problemsTIP# HKTT2004-03Isolating audio problems in an AVR receiverUsing 6/8 Direct InThe following charts are used to help the tech quickly isolateaudio problems in an AVR receiver. Use the followingprocedures to help find what is working, then to quickly locatethe problem area.Equipment needed:9 1 set of (RCA) Y adaptors.9 Function/signal generator.9 Oscilloscope.Models covered:AVR210 AVR310AVR220 AVR320AVR520 AVR225AVR125 AVR525AVR130 AVR230AVR330 AVR430AVR630Procedure:1) Do a factory reset of the receiver. (This will eliminate any common micro processorproblems.) Reset List can be found in this service manual.2) Print the block diagram from the service manual.3) With no inputs or speakers attached to the AVR turn on the receiver and turn thevolume all the way down.4) Turn unit off.5) Hook up an oscillator to the 6/8 Direct in jacks using the Y adaptors. Adjust theoscillator to about 0db (.775Volts RMS).6) Hook up an oscilloscope to monitor the line out jacks. Or, if there are no line out(preamp out) jacks monitor the input to the power amps or the speaker outs.(AVR125, 225, 130 do not have preamp out jacks)7) Turn the AVR on. Select 6 or 8 direct in, depending on the receiver.8) Slowly turn the volume control up until you can easily measure the voltage at the lineout jacks. ( -40 to -25db )Harman Consumer Group 250 Crossways Park Dr. Woodbury, New York 11797Email Techsupport@harman.com18AVR330 harman/kardon