P/N UM402LB REV20190501
12
TROUBLESHOOTING
Troubleshooting
Before contacting service personnel, refer to the following instructions to check and to correct
any failures for incorrect weight measurements.
The accuracy of the 402LB scale when calibrated at the factory is /- ¼ pound. For the
most accurate weight measurement, use the scale on a hard level surface and stand in the
center of the platform. If the error seems excessive, check the following:
Symptom
Possible Cause
Corrective Action
Questionable weight, or
the scale does not
center equally in the trig
loop when the poise
weight is
“0” value
Bar does not “0”
balance
The balance ball must be balanced such
that the pointer comes to rest in the center
of the trig-loop when both poise weights
are set at “0” value.
Ensure that the upper and lower poise
weights are firmly against the shoulder of
the beam.
Adjust the balance ball screw by turning
the screw at the left end of the bar.
Bar does not move
freely
Bar sticking or
adjustment needed
Check if the pointer is touching the side of
the trig loop in its range of travel.
Realignment of the beam may be
necessary if it is touching.
Ensure that the upper and lower poise
weights are firmly against the shoulder of
the beam.
Adjust the balance ball screw by turning
the screw at the left end of the bar.
Platform rocks
excessively or touches
base at any corner
Base out of alignment
Follow the base alignment instructions on
the next page.
Beam does not move at
all during weighing
process
Scale may have
improper steel rod
connection or poise
weight may have been
set at a higher weight
than patient
’s actual
weight.
Reset the weights to a lower weight.
Ensure the steel rod is connected
properly;
refer to “Assembly Instructions”
on page 5.
Scale not accurately
measuring weight
Scale out of
calibration.
The scale can be recalibrated by
loosening the lock screw at the end of the
long lever in the bottom of the base with a
¾” hexagon socket wrench and moving it
outward (longer) in the elongated slot to
decrease the indicated weight or inward
(shorter) to increase the indicated weight.
One sixteenth inch movement of the
screw will change the indicated weight by
approximately one-quarter pound per 100
pounds.
For further assistance please contact technical support toll free at 1 (800)-638-3722.
