OHAUS TA152, Service Manual

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CHAPTER 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 hour after turning the scale on, for the scale electronics to stabilize.
3.1.1 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. The Traveler takes four “C” (LR 14) batteries.
5. Make a visual inspection for faulty connectors, wiring, and loose hardware.
3.2 OPENING THE SCALE
Turn the scale off and unplug the power cord and remove batteries before you begin.
1. Remove the Weighing Pan; then turn the Sub-Pan in a clockwise direction to lift it off.
2. Turn the scale over. Remove the
three screws shown in Figure 3-1.
3. Turn the scale back on its feet, and
lift off the Housing. The internal
parts – the Load Cell and Printed
Circuit Board (PCB) – are now
accessible.
Note: When replacing the Weighing
Pan and Sub-Pan (the reverse of Step
1), turn the Sub-Pan slightly in a
counter-clockwise direction to secure it.
Screws that
secure the
Housing
Figure 3-1. Scale Bottom, with three screws
that secure the Housing shown.
Traveler™ Series Service Manual 3-1 Ohaus Corporation www.ohaus.com