Harman Kardon avr445 Service Manual

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Contents

Harman Kardon avr445 Service Manual Manual pdf 37 page image

SERVICE PROCEDUREALIGNMENT PROCEDURES1.MAIN AMP idling AdjustmentSET CONDITION1) SEMI VOLUME POSITION at MAIN/SURROUND AMP BoardMAIN:VR71.VR72SURROUND:VR73.VR74NO Signal/No LoadAC Line Voltage:120V/60Hz.230V/50Hz2) After turning on the unit keep it over than 25min (keep the power/Driver TR as normal temperature)3) Adjust the voltage value of primary&secondary of wafer to be 25mV by rotating the semi volume of each channelto the rightCHANNEL ADJUSTMENT MEASUREMENT VOLTAGEFRONT-L CH VR71 P817 23+/-2mVFRONT-R CH VR72 P805 23+/-2mVSURROUND-L CH VR73 P818 23+/-2mVSURROUND-R CH VR74 P806 23+/-2mV4) CAUTIONIn case that power TR or DRIVER TR is needed to be replace for repairing the corresponding channel should beadjusted againFRONT AMP:Q437.Q433.Q435.Q439.Q438.Q434.Q436.Q440SURROUND AMP:Q333.Q329.Q331.Q335.Q334.Q330.Q332.Q3362.SURROUND BACK AMP idling AdjustmentSET CONDITION1) SEMI VOLUME POSITION at CENTER/SURROUND BACK AMP BoardCENTER:VR501SURROUND BACK:VR201.VR301NO Signal/No LoadAC Line Voltage:120V/60Hz.230V/50Hz2) After turning on the unit keep it over than 25min (keep the power/Driver TR as normal temperature)3) Adjust the voltage value of primary&secondary of wafer to be 25mV by rotating the semi volume of each channelto the rightCHANNEL ADJUSTMENT MEASUREMENT VOLTAGECENTER VR501 P501 23+/-2mVSURR BACK-L CH VR201 P201 23+/-2mVSURR BACK-R CH VR301 P301 23+/-2mV4) CAUTIONIn case that power TR or DVIER TR is needed to be replace for repairing the corresponding channel shouldbe adjusted againCENTER AMP:Q519,Q517.Q516,Q518SUR BACK AMP:Q319.Q317.Q316.Q318.Q219.Q217.Q216.Q2183.Cautions for main adjustment1) At MAIN/SUPPLY BOARD.use the below capacitor after discharging for sufficent time for preventingpossible damage from electrical sparkMAIN C571.C572 AVR745/645 15000/63VBOARD C571.C572 AVR445 12000/63VSUPPLY C201,C202 AVR745/645 10000/63VBOARD C201,C202 AVR445 8200/63V2)The checking for MAIN/SUPPLY BOARD should have the discharging circuit dischargeover 30sec.through(4R7Ohm 10W)resistor after push power sw offAVR445 harman/kardon37