KERN MWB series Service Manual

18 MWB-SH-e-1810.docx13 MAINTENENCE13.1 GeneralIf the scale does not operate properly, find out the problem as possible. Determinewhether the problem is constant or alternate. Be aware that problems can be caused bymechanical or electrical influences.Check the following. Water Corrosive materials Vibrations or temperature or wind Physical damageCheck the scale cables for damage, and check all connections and connecters for anyloose contact or incorrect connection13.2 Cleaning Disconnect the power before cleaning. Use a cloth with mild suds and light cleaning agents. Make sure that fluid not able to get into the device. Use a clean and soft cloth for rub off.13.3 Determine the ProblemDetermine whether the problem is in the PCB or the Load Cell Remove power from the system, and disconnect the load cell connection fromthe PCB Connect the PCB to a load cell simulator Reapply power and test the PCB If problem goes away, its source is probably in the Load cell. Check thewiring, connecter, load cell and mechanical components of the load cell.If problem persists, its source is probably in the PCB. Check the PCB voltages,connecters, cables and function programs13.4 Check the Load cell Remove power from the system, and disconnect the PCB from the Load cell Check the moisture, or foreign material inside. Make sure all leads are connected and correctly. Check load cell for proper input and output resistances