Yamaha EK40G Service Manual

6H95G11 8-2987654321Special service tools/Checking the electrical componentsChecking the electricalcomponentsMeasuring the peak voltageNOTE:Before troubleshooting the peak voltage,check that all electrical connections are tightand free from corrosion.The condition of the ignition system can bedetermined by measuring the peak voltage.Cranking speed is affected by many factors,such as fouled or weak spark plug. If one ofthese factors is present, the peak voltage willbe lower than specification. In addition, if thepeak voltage is lower than specification theengine will not operate properly.wWhen checking the peak voltage, do nottouch any of the connections of the digitalcircuit tester leads.NOTE:9 Use the peak voltage adaptor with the digi-tal circuit tester.9 When measuring the peak voltage, set theselector on the digital circuit tester to theDC voltage mode.9 Connect the positive pin on the peak volt-age adaptor to the positive terminal of thedigital circuit tester.Measuring low resistanceWhen measuring a resistance of 10 or lesswith the digital circuit tester, the correct mea-surement cannot be obtained because of theinternal resistance of the tester. To obtain thecorrect value, subtract the internal resistancefrom the displayed measurement.NOTE:Obtain the internal resistance of the digitalcircuit tester by connecting both of its probesand checking the display.6B480010Correct value =displayed measurement- internal resistance