Specifications

Troubleshooting 25
6.0 Troubleshooting
The following section contains a troubleshooting chart for the QB Series scale. Refer to this chart to locate
causes and corrective actions to various conditions.
Condition Cause Corrective Action
Display does not
stabilize
•Wind or vibration is affecting scale • Set up balance elsewhere or under a
protective hood
• Scale is set on unstable surface • Set the scale on a firm surface that is free
from vibrations
• Span is out of calibration • Level the scale
• Perform span and zero adjustment
Displayed value is in
error
Weight value is drifting
•Tare value entered incorrectly • Clear and re-enter tare value
• Balance is not set level • Set balance level
• Span is out of calibration • Perform span adjustment
• Interference with weigh pan or pan
support
• Check for foreign material under weigh pan
or weigh pan support
Linearity error • Mechanical adjustment has changed • Consult your local Rice Lake Weighing
Systems Service distributor
Display is blank • Adapter is not connected
• Battery needs recharging
• Auto Power OFF is activated.
• Connect AC adapter to the scale and 120
VAC outlet
• Recharge battery
•Press the ON/OFF key
Comparator limits can
not be established
• Device is not set to comparator mode
• Reference value is greater than the
nominal capacity of the device
• Lower limit value is ≥ upper limit value
•Turn on comparator mode
• Change reference value
• Change lower limit value
Balance does not weigh
to nominal capacity
•Tare + sample weight exceeds capacity
•(Weight range = maximum capacity –
tare weight)
• Add the individual weights of the tare and
the commodity to determine if together they
are more than the nominal capacity of the
device
b
-ERR
• Electronic malfunction due to
electro-static discharge (ESD) or
electro-magnetic interference (EMI)
• Consult your local Rice Lake Weighing
Systems distributor
L-ERR
• In counting mode, the unit weight of the
samples is less than the minimum
division of the device
• This commodity can not be counted with
this device
O-ERR
• Capacity is exceeded • Use a test mass to ensure the balance can
weigh to its rated capacity
• Ensure that the commodity being weighed
is not in excess to the nominal capacity of
the balance
• Consult your local Rice Lake Weighing
Systems distributor
U-ERR
• Interference with the weighing pan or
weighing pan support
• Remove interference
Table 6-1. Troubleshooting Chart