OHAUS NV212 Service Manual

Also see for Navigator NV1101: Instruction manual Instruction manual

Contents

OHAUS NV212 Service Manual Manual pdf 25 page image

CHAPTER 3 MAINTENANCE PROCEDURESNavigator Series Service Manual 19 Ohaus Corporation www.ohaus.com3 MAINTENANCE PROCEDURES3.1 PREVENTIVE MAINTENANCEOhaus scales are precision instruments and should be carefully handled, stored in a clean, dry,dust-free area, and cleaned periodically. Follow these precautionary steps:– When a scale has had chemicals or liquids spilled on it, all exterior surfaces should be cleanedas soon as possible with warm water on a damp cloth.– Do not leave a mass on the scale when the scale is not in use.– Allow time for the scale to stabilize after moving it from an area which is at a differenttemperature than the area where it is to be operated. Allow one hour for each 5°F (2.7°C)temperature change before using the scale. After temperature stabilization, allow an additional20 minutes after turning the scale on, for the scale electronics to stabilize.Preventive Maintenance ChecklistThe scale should be inspected and checked regularly, as follows:1. Remove the Pan and Sub Pan to inspect and clean the area beneath the Pan.2. Clean the outside of the scale using a damp cloth with warm water.CAUTIONDO NOT USE CHEMICAL CLEANERS OR SOLVENTS OF ANY TYPE.SOME CLEANERS ARE ABRASIVE AND MAY AFFECT THE SCALE’S FINISH.3. Check the Power Cord for broken or damaged insulation.4. If using batteries and the scale malfunctions, first replace the batteries to see if this resolves theproblem. To isolate a problem with the rechargeable battery option kit, the scale can beconverted back to standard alkaline batteries (see Rechargeable Battery Option User Manual).5. Make a visual inspection for faulty connectors, wiring, and loose hardware.3.2 OPENING THE SCALEOpening the Navigator scale varies slightly according to the specific model, as detailed below. Usethese procedures in order to replace the Load Cell, the Printed Circuit Board or other components.Opening Navigator ModelsCommon hand tools are sufficient to disassemble the Navigator scales. Turn the scale off andunplug the power cord before you begin. Remove any installed batteries. On models with theRechargeable Battery Option installed, the battery and the Recharge PCB must be removed. Seethe Rechargeable Battery Option Kit instructions for additional information.1. Remove the stainless steel Weigh Pan.2. Remove the conductive rubber cap over the Pan Support Screws.