Maintenance Procedures - OHAUS NV212 Service Manual

3 MAINTENANCE PROCEDURES

3.1 PREVENTIVE MAINTENANCE
Ohaus 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 cleaned
as 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 different
temperature 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 additional
20 minutes after turning the scale on, for the scale electronics to stabilize.
Preventive Maintenance Checklist
The 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.
CAUTION
DO 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 the
problem. To isolate a problem with the rechargeable battery option kit, the scale can be
converted 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 SCALE
Opening the Navigator scale varies slightly according to the specific model, as detailed below. Use
these procedures in order to replace the Load Cell, the Printed Circuit Board or other components.
Opening Navigator Models
Common hand tools are sufficient to disassemble the Navigator scales. Turn the scale off and
unplug the power cord before you begin. Remove any installed batteries. On models with the
Rechargeable Battery Option installed, the battery and the Recharge PCB must be removed. See
the 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.
Navigator Series Service Manual
CHAPTER 3 MAINTENANCE PROCEDURES
19 Ohaus Corporation www.ohaus.com