Service Information
81
SCALE SYSTEM DIAGNOSTICS AND CALIBRATION (CONTINUED)
Displaying Individual Load Cell Outputs (Continued):
The two buttons listed below function as POSITION buttons to select the four corners of the bed’s litter.
Whenever the LCD displays “ƜƝ SELECT CORNER”, press one of these buttons to cycle through the
corners and to select the load cell assembly at the desired corner.
A. ZERO = cycle up through the four corners
B. SCALE ON/OFF = cycle down through the four corners
4. Press and release the position button that corresponds with the load cell to be checked. The LCD should
display “X/X=NNN.N”. ”X/X” represents the initials of the selected corner, i.e. H/R will be displayed for
the patient’s head end, right side. ”NNN.N” represents the resistance of the load cell.
5. Repeat step four for each corner. Head end weight readings will normally be lower than foot end weights.
Weight readings should be constant. A drifting 000.0 or 999.9 weight, or a reading that does not change
when weight is applied to that corner of the bed indicates a problem with the selected load cell assembly
or load cell cable.
Verifying Scale Accuracy:
1. Zero the empty bed. Place a known weight on the center of the bed; the heavier the better and no less
than 100 pounds. The displayed weight should be within ± 2% of the actual weight.
2. If the displayed weight is not accurate, remove the weight from the bed and place the scale CPU in calibra-
tion mode.
Scale Calibration:
NOTE
It requires two people to enable the calibration mode for the scale system.
Calibrate the scale system with a known weight of approximately 50 pounds.
1. To enter the calibration mode, unplug the bed’s power cord from the wall socket.
2. Press and hold down the LBS/KGS button.
3. While still holding the LBS/KGS button, plug the bed’s power cord into the wall socket.
4. After two seconds, release the LBS/KGS button. The LCD should read “ANGLE CALIBRATE”. The cal-
ibration mode is now active.
5. Press and hold the ENTER button (LBS/KGS). Zero the bed, following the displayed instructions. When
the bed is zeroed, the LCD should display “REF X100=<0>5000”. This is the factory default for 50
pounds. If 50 pounds will be used to calibrate the scale, proceed to step 7.
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