OHAUS EB SERIES Service Manual

Contents

OHAUS EB SERIES Service Manual Manual pdf 14 page image

CHAPTER 2 DIAGNOSISOhaus Corporation www.ohaus.com 2-2 EB Series Scales Series Service ManualTABLE 2-2. SCALE WILL NOT TURN ON USING BATTERY POWERSYMPTOM PROBABLE CAUSE REMEDYScale will not turn onusing battery power.Battery discharged ordefective.Wiring harness defective orbattery clips connectionbroken.Membrane Switch defective.Main PC Board is defective.Test the battery (Section 2.9). Replaceif necessary (Section 3.6).Open the scale (Section 3.1). Checkvoltage at battery contacts first. CheckDC voltage at the battery connector onthe Main PC Board. Voltage shouldread approximately 6 Volts DCminimum. If voltage is not present atthe connector, disconnect the leadsfrom the battery and make a continuitytest between the connectors on theHarness to the connector on the MainPC Board. Resistance should be 0ohms for the red lead and 0 ohms forthe black lead. If an open conditionexists, replace wiring and connector asnecessary. If OK, proceed.Test the Membrane Switch (Section2.6). Replace if necessary(Section 3.2).If the scale fails to turn on with a newMembrane Switch, test the Main PCBoard (Section 2.8). If defective,replace the Main PCB (Section 3.3.1).After repair, proceed with PerformanceTests in Chapter 4.