CS750 User Manual
Rev E, April 2018
Page 28 of 31
Troubleshooting
Problem Table
Refer to the Problem table for potential troubleshooting systems, causes and solutions.
Will Not Power Up. Blank Display
If power reaches the control panel, the display driver turns on random segments. A blank display could mean power
is not reaching the scale circuitry.
Possible Causes:
Defective wiring harness: Inspect for damaged wiring.
Defective battery pack: Measure battery voltage, charge or repair as needed.
Defective ON switch: Bridge switch to see if unit turns on.
Defective circuitry: Replace control panel.
The power supply may be delivering power, but a defective circuit board or cable may prevent power from reaching
the intended circuit. Unplug the load cell cable. If the scale turns on at this point, a load cell lead is shorted. Turn
the power off and try each cell lead in turn to determine the source of the problem. When found, inspect the cable.
Power Up to Random Display
Power is reaching the display driver circuit, but the control panel is not working correctly. Test for low battery
voltage. Inspect for visible damage. If this fails replace the control panel.
If the scale turns off IMMEDIATELY after the On/Off button is released it may indicate low battery levels. Replace
the batteries. If battery replacement does not work, it may be necessary to replace the control panel.
The scale may be programmed incorrectly. This can be corrected by restoring the correct control parameters. If the
Average Rate setting is very high, an active load may not update the display quickly which in turn may be
interpreted as a lock up.
Cover the light sensor window. If the light does not turn on, replace the control panel. Please note that the light is
not visible in bright sunlight.
May be caused by a programmed change in the filter setting. There is a tradeoff between speed and stability of the
display reading. This can be tuned by changing the "Average Rate" setting.
Low Battery Indicator Will Not Turn-Off
Battery output is very low. Check battery voltage level indicator and replace if required. If the battery voltage is
correct the control panel may need to be replaced.
Erratic or Drifting Weights
May be traced to contamination on circuit boards or a bad load cell. A rapid change in temperature may also trigger
the symptom. The scale requires at a minimum of one-hour of acclimation time for each 10 degree Fahrenheit
change in temperature. Another potential cause could be powerful radio interference.
No Response to One or More Buttons
The switch may be defective. The control panel may be defective. (Note: The zero button does not function while
the scale is in motion). The scale may be programmed to ignore the zero button when there is an excess amount of
weight (over what should be on the scale) on the platform.
Check weighing technique and scale settings. Verify reference scale is correct? Is the scale spanned correctly?
Inspect interconnecting wiring and cables for pinching or damage.
CAUTION: Changing a circuit board or load cell may affect calibration. Calibration
should be checked after any maintenance or repairs have been performed
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