Service Manual
Page 26 of 50
4. Maintenance
4.1. Preventive Maintenance
OHAUS scales are precision instruments which should be handled carefully, stored in a clean, dry, dust-free
area, and cleaned periodically. Follow these precautionary steps:
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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.
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Do not leave any weights on the scale when the scale is not in use.
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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:
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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.
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Check to ensure that the power cord is not broken and has no damaged insulation.
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If using batteries and the scale malfunctions, first replace the batteries to see if this resolves the problem.
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Make a visual inspection for faulty connectors, wiring, and loose hardware.
4.2. Troubleshooting
This section of the manual contains troubleshooting information. It includes information to isolate specific
problems step by step. Before doing any such work, make certain that your working area is clean, that you
handle all scale components with care, and that you use a suitable electro-static device.
Diagnostic Guide:
Scale inoperative/ blank displays
1. Check voltage on power supply. If voltage at outlet is zero, replace power supply.
2. Check whether the harnesses are properly connected.
3. Try to press the keyboard. If you can hear a beep while pressing the keyboard, replace the display.
Otherwise please replace the mainboard.
Keyboard inoperative
1. Check keyboard connection on main board, ensuring it is securely plugged in.
2. If all connections are secure and keyboard is inoperative, replace keyboard.
Can
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t communicate via RS232 with peripheral printer (Print function is not available in all
countries)
1. Check the scale version. Only Aviator 7000 has this function.
2. Check Operational setup parameters:
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Communication port STEP 15 must be set to RS232
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Communication type STEP 16 should be set to Printer
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Check if Communication speed STEP 18 & Data Bits, STEP 19 are set to default settings
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Check if a printer recommended by OHAUS for this scale is connected to the scale
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Check if peripheral printer is switched on and has enough power
3. If all parameters are correct, please
