Harman Kardon AVR 660/230 Service Manual

SERVICE PROCEDUREALIGNMENT PROCEDURES1.MAIN AMP idling AdjustmentSET CONDITION1) SEMI VOLUME POSITION at MAIN/SURROUND AMP BoardMAIN:VR101,VR102,VR103,VR104SURROUND:VR501,VR601,VR701NO 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 VR104 P114 23+/-2mVFRONT-R CH VR101 P111 23+/-2mVSURROUND-L CH VR103 P113 23+/-2mVSURROUND-R CH VR102 P112 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.Q333.Q335.Q439.Q438.Q334.Q336.Q440SURROUND AMP:Q618.Q619.Q518.Q519.Q718.Q7192.SURROUND BACK AMP idling AdjustmentSET CONDITION1) SEMI VOLUME POSITION at CENTER/SURROUND BACK AMP BoardCENTER:VR501SURROUND BACK:VR601.VR701NO 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 VR601 P601 23+/-2mVSURR BACK-R CH VR701 P701 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:Q618.Q617.Q618.Q619.Q716.Q717.Q718.Q7193.Cautions for main adjustment1) At MAIN/SUPPLY BOARD.use the below capacitor after discharging for sufficent time for preventingpossible damage from electrical sparkMAIN BOARD C151.C152 AVR7550HD 15000/63VSUPPLY BOARD C3101,C3102 AVR7550HD 10000/63V2)The checking for MAIN/SUPPLY BOARD should have the discharging circuit dischargeover 30sec.through(4R7Ohm 10W)resistor after push power sw offHarman KardonAVR 660 -760, 230V Service ManualPage 70 of 264