雅马哈yamaha-m80-pwr-维修服务手册含电器原理图

STEREO POWER AMPLIFIERM-80SERVICE MANUAL况四000■TO SERVICE PERSONNEL1.Critical Components Information.Components having special characteristics are marked and must be replaced with parts havingspecifications equal to those originally installed.2.Leakage Current Measurement(For 120V Model Only).When service has been completed.it is imperative that you verify that all exposed conductive surfaces are properly insulated from supply circoitsMeter impedance should be equivalent to 1500 ohm shunted by 0.154F.Leakage current must not exceed 0.5mAEQUIPMENTBe sure to test for leakage withUNDER TEST8品0 ALENSTERAC plug in both polarities.WALLOUTLETINSULATING TABLE■CONTENTSREAR PANEL...............................................P.C.BOARD一POWER SUPLY.......…7BL0 CK DIAGRAM…2SCHEMATIC DIAGRAM -MAIN..............8SCHEMATIC DIAGRAM-METER.................9DISASSEMBLY PROCEDURE..............3VIRING DIAGRAM…9INTERNAL VIEW…4PARTS LIST-ELECTRIC....-...…10ADJUSTMENTS…4EXPLOADED VIEW-MECHANISM/CHASSIS...14P.C.BOARD一METER…5PARTS LIST-MECHANISM/CHASSIS............16P.C.BOARD-MAIN............................6SINCE 1887YAMAHA004561NIPPON GAKKI CO.LTD.HAMAMATSU JAPAN2.6K-981 Printed in Japan 84.7