OHAUS TROOPER SCALE, Service Manual

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4-1
CHAPTER 4 MAINTENANCE PROCEDURES
4.1 PREVENTIVE MAINTENANCE
Ohaus scales are precision instruments and should be carefully handled, stored in a clean dry area
which is dust free, and cleaned periodically. It is recommended that when a scale has had chemicals
or liquids spilled on it, the scale should be cleaned as soon as possible. Use warm water on a damp
cloth to clean all exterior surfaces. Do not leave a mass on the scale when not in use. When moving
the scale from a storage area which is at a different temperature than the area where it is to be operated,
allow sufficient time for the scale's mechanism to temperature stabilize. This time can vary quite a bit
depending upon the temperature differences. Allow one (1) hour for each 5 degrees Fahrenheit
temperature change before using the scale. Also, after turning the scale ON, allow one hour after
temperature stabilization for the scale electronics to stabilize.
4.1.1 Preventive Maintenance Checklist
On a regular basis, the scale should be inspected and checked as follows:
1. Remove the Platform and inspect and clean the area beneath the Platform. Remove any
accumulated dirt or dust.
2. Clean the outside of the scale using a damp cloth with water.
CAUTION
DO NOT USE CHEMICAL CLEANERS OR SOLVENTS
OF ANY TYPE. SOME CLEANERS ARE ABRASIVE
AND MAY AFFECT THE FINISH OF THE SCALE.
3. Check the Power Cord for broken or damaged insulation.
4. Make a visual inspection for faulty connectors, wiring, and loose hardware.
4.2 TESTING
Before servicing the Trooper scale, an operational test and various performance tests should be made
to ascertain whether or not the scale meets specifications. Turn the scale on and allow it warm up for
at least one hour before performing these tests. Make sure the test area is free from drafts and the
surface that the scale rests on is level and vibration free. The masses used for the performance tests
and adjustments must meet or exceed ASTM Class 4 Tolerance.
4.2.1 Operational Test
1. Connect the AC Adapter into a suitable power source and connect to the scale.
4.2.1.1 Segment Display Test
1. Turn the scale on, all segments are enabled and displayed breifly followed by a software
revision number. This is a segment display test. Figure 4-1 is a full display test.
Figure 4-1. Segment Displays
l b
k g
oz
BAT
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