Stryker Medical 2025, Maintenance Manual

Page: 21 / 140

Maintenance Procedures – Litter
20
DISPLAYING INDIVIDUAL LOAD CELL OUTPUTS
A defective load cell can be detected by entering diagnostics and displaying individual load cell outputs.
1. To enter the diagnostic mode, unplug the bed power cord from the wall socket. Press and hold the LBS/KG
button. While holding the button, plug the bed power cord into the wall socket. Release the LBS/KG button
and the scale monitor will display “CALIBRATE SCALE”.
2. Press the arrow up button until the scale monitor displays “CHECK CORNERS”.
3. Press the ENTER button. The scale monitor should display “PICK CORNER NOW”.
4. Press and release the button that corresponds with the load cell to be checked (see below). The scale
monitor will display X/X=NNN.N. ”X/X” represents the initials of the selected corner, i.e. H/R will be dis-
played for the patient’s head end, right side. ”NNN.N” represents the load cell output.
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, press and release SCALE ON/OFF. To exit diagnostics,
unplug the bed’s power cord from the wall socket.
LOAD CELL REPLACEMENT
Required Tools:
9/16” Socket Wrench 9/16” Open End Wrench Saw Horse (or Equivalent)
Wire Cutters #2 Phillips Screwdriver
Replacement Procedure:
1. Raise the head or knee section, depending which end of the litter needs service.
2. Unplug the load cell connector from the load cell cable. If service is being done at the head end of the
bed, the J–channel must be removed to access the load cell connector.
3. Using wire cutters, remove the wire ties holding the cable to the frame.
4. Using a 9/16” socket and a 9/16” open end wrench, remove the two bolts holding the load cell to the litter
cross tube and remove the load cell.
5. Using a saw horse, support the litter at the end where the load cell was removed. Reverse the above
procedure to install the new load cell.
NOTE
Scale calibration procedure must be performed after the load cell is replaced (see page 21).