nad-214-216-power-amp-sm-pdf-SERVICE-MANUAL维修手册

NADSERVICE SAFETY PRECAUTIONS(UL)1.Use exact replacement parts for critical locations marked "dss tooginlposii and intll rrBefore returning to customer,test for shock hazard;use either mothod A or BA.Leakage test "cold":1.Unplug the AC cord;tum power switch ON2Connect one lead of High Voltage Insulation Tester to both prongs of the AC plug.3.Touch other lead to all exposed metal parts.4.Impedance measurement must be 0.3-5.0 Megohms.B.Leakage test,"live":1.Plug unit directly into the AC outlet:do not use isolation transformern)2.Connect one lead of the Leakage Current Tester to earth ground.3.Touch other lead to all exposed metal parts.4.Leakage measurement must be less than 0.5 milliamps912172214/216STEREO POWERAMPLIFIER