Stryker Medical 2025, Maintenance Manual

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Maintenance Procedures – Base
14
LIFT POTENTIOMETER REPLACEMENT
Required Tools:
#2 Phillips Screwdriver Small Standard Screwdriver Bungee Cords (or Equivalent)
1/2” Open End Wrench Wire Cutters
Replacement Procedure:
1. Raise the litter up to full height and unplug the bed power cord from the wall socket.
2. Using a #2 Phillips screwdriver, remove the three Phillips screws holding the base hood to the base frame.
3. If the bed is equipped with the 110V outlet option, remove the slotted screw holding the outlet cover. If
the bed does not have the 110V outlet option, remove the two slotted screws holding the cover plate.
4. Use bungee cords or the equivalent to secure the hood up and out of the way.
5. Using a 1/2” open end wrench, remove the nut holding the potentiometer to the bracket.
6. Remove the potentiometer by pulling it outward.
NOTE
The nylon gear will slide off the end of the shaft.
7. Using wire cutters, remove the cable ties holding the cable to the bracket and frame, unplug the cable,
and remove the potentiometer.
8. Reverse steps 5–7 to install the replacement potentiometer.
LIFT POTENTIOMETER “BURN–IN” PROCEDURE
NOTE
It requires two people to enable the diagnostics mode for the bed.
1. After a new potentiometer has been installed, it must be calibrated. (If a new potentiometer was not
installed, go to step 2.) Use a small standard screwdriver to reach through the access hole in the poten-
tiometer bracket into the slot in the end of the potentiometer shaft. Turn the potentiometer shaft clockwise
until it stops and then back counterclockwise 1 1/2 turns.
2. Press and hold the “Bed Motion Lock” and “Knee Lockout” buttons on the foot board.
3. While continuing to hold the two buttons down, plug the bed power cord into the wall socket. Release the
two buttons and the Knee Lockout LED should be flashing. This indicates the bed is in the correct calibra-
tion mode.
4. To “burn in” the Bed Up/Down limits for a low height bed, lower the bed to the full down position. Press
and hold the “Bed Motion Lock” and the “Knee Down” buttons at the same time. The “Bed Motion Lock”
LED will light. Continue to hold the “Bed Motion Lock” and “Knee Down” buttons until the “Bed Motion
Lock” LED flashes. The flashing LED indicates the limits have been set. Release the “Bed Motion Lock”
button first, then the “Knee Down” button.
Important: If the buttons are not released as described above, the bed could be “burned in” incorrectly.
Unplug the bed power cord to complete the “burn in” mode.
5. To “burn in” the Bed Up/Down limits for a high height bed, lower the bed to the full down position. Press
and hold the “Bed Motion Lock” button. The “Bed Motion Lock” LED will light. Continue to hold the “Bed
Motion Lock” button until the “Bed Motion Lock” LED flashes. The flashing LED indicates the limits have
been set. Release the button and unplug the bed power cord to complete the “burn in” mode.
6. Reattach the base hood and run the bed up and down a few times to verify proper operation.
7. The distance between the floor and the top of the litter seat section (without mattress) on a high height
bed should be approximately 22 1/2” with the litter fully down and approximately 35” with the litter fully up.
On a low height bed, the distances should be approximately 20 1/2 “ to 31”.
NOTE
This procedure is the same for the head and the foot end of the bed.