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0417 IH-1649
TROUBLESHOOTING
OPERATING ISSUE
CAUSES
RECOMMENDATIONS
Display is blank, scale
shuts off or will not turn on.
Main power is turned off.
Power supply not plugged in.
Power supply faulty.
Internal battery not charged.
Display turned off.
Check that power is going to the
scale. Verify that switch is turned on.
Verify the voltage going to the scale
matches the power supply labels on
the power module or scale.
Remove battery and plug the scale
in. If the scale works, you will need to
replace the battery.
Display blank after turn-on
test; error message display is
locked.
Pan not installed.
Unstable weight.
Load cell or mechanics damaged.
Mechanics damaged.
Check if pan is installed correctly.
Turn the scale on again.
OL or FULL displayed.
Maximum capacity exceeded.
Load cell or mechanics damaged.
Power supply faulty.
Check if pan is installed correctly.
Turn the scale on again.
UL or NULL displayed.
Weight on scale below permissible limit.
Pan has been removed.
Pan support not seated properly.
Power supply faulty.
Load cell or mechanics damaged.
Check if pan is installed correctly.
Press the
ZERO
key to reset.
Turn the scale on again.
Display is unstable.
Drafts or air currents.
Obstruction under pan.
Sample is moving (animal weighing).
Vibrations through table.
Temperature changed dramatically.
Power supply faulty.
Verify the scale is in an acceptable
location and on a stable surface.
Verify the power supply is correct for
the scale.
Scale not weighing correctly.
Calibration error.
Linearity error.
Unit calibrated with inaccurate weight.
Balance not level.
Obstruction between sample and cover.
Wrong unit of weight displayed.
Automatic accumulation is turned on
(AU on).
Double-check unit of weight.
Re-calibrate.
Set linearity.
Check if pan is installed correctly.
Verify installation is
acceptable.
Turn AU off
(see Operation section).
Cannot use full capacity.
Overload stops hitting pan support or
hitting bottom of load cell.
Electronic problem on A/D.
Parameters set incorrectly.
Load cell or mechanics.
Double-check unit of weight.
Look for obstruction under pan and
verify pan installation.
