Stryker 2031, Maintenance Manual, Page: 55 / 185

page 7–2
Scale System Diagnostics and Calibration
Diagnostic Mode Functions:
1. Calibrate Scale: This is required in the field if a CPU board or a load cell is replaced.
2. Display Corner: This function displays the individual reference numbers for each load cell assembly and
can be used to isolate a defective load cell.
3. Init. to Defaults: This may be required in the field when replacing a CPU board or a load cell.
4. Erase E–prom: This is a factory setting not used in the field.
5. Display Factor: This is a factory setting not used in the field.
5. Exit Diagnostics: Changes made in the diagnostic mode must be saved in permanent memory using this
function. Switching off power without saving will reset all variables to their previous values.
Diagnostic Mode:
NOTE
It requires two people to enable the diagnostic mode for the scale system.
1. To enter diagnostic 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 display “CALIBRATE SCALE”. The
diagnostic mode is now active.
Displaying Individual Load Cell Outputs:
A defective load cell can be detected by entering diagnostics and displaying individual load cell outputs.
1. Enter the diagnostic mode. The LCD will display “CALIBRATE SCALE” when the diagnostic mode is acti-
vated.
2. Repeatedly press and release the up or down arrow button (ZERO or SCALE ON/OFF) until the LCD dis-
plays “DISPLAY CORNER”.
3. Press and release the ENTER button (LBS/KGS). The LCD should display “PICK CORNER NOW”.
The four buttons listed in the group below function as POSITION buttons corresponding with the four cor-
ners of the bed’s litter. Whenever the LCD displays “PICK CORNER NOW”, press one of these buttons
to select the load cell assembly at the desired corner.
A. ZERO = head end, patient’s left side
B. CHANGE EQUIP. = head end, patient’s right side
C. TREND/FOWLER ANGLE = foot end, patient’s right side
D. LBS/KGS = foot end, patient’s left side
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.
6. When all the load cell outputs have been checked, repeatedly press and release the SCALE ON/OFF but-
ton until the LCD displays “EXIT DIAGNOSTICS”. Press the ENTER button (LBS/KGS) to exit diagnos-
tics.