Stryker Medical 2025, Maintenance Manual

Page: 20 / 140

Maintenance Procedures – Litter
19
CPU BOARD REPLACEMENT
Required Tools:
#2 Phillips Screwdriver Needle Nosed Pliers
Replacement Procedure:
1. Properly ground yourself (see page 7 for static discharge precautions). Verify the bed power cord has
been unplugged from the wall socket.
2. Manually crank up the knee section until it stops.
3. Using a #2 Phillips screwdriver, remove the four screws holding the litter access cover to the litter and
remove the cover.
4. Remove all connectors from the CPU board, noting where they were connected so they will be connected
properly to the new CPU board.
5. Use needle nosed pliers to release the standoffs under the CPU board and remove the board from the
standoffs.
6. Reverse the above procedure to install the replacement CPU board.
7. After a CPU board is replaced, a “burn–in” procedure must be performed (see below).
NOTE
If the bed is equipped with a scale system, a scale calibration procedure must also be performed after the
CPU board is replaced (see page 21).
LIFT AND FOWLER POT “BURN–IN” PROCEDURE
NOTE
It requires two people to enable the diagnostics mode for the bed.
1. Unplug the bed power cord from the wall socket.
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
calibration mode.
4. Using the foot board controls, run the Fowler up to 90
_
. Press and hold the button on the foot board to
lock out the siderail controls for the back until the padlock LED flashes. Release the button.
5. Using the foot board controls, run the Fowler down to 0
_
. Press and hold the button on the foot board
to lock out the siderail controls for the knee until the padlock LED flashes. Release the button..
6. 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.
7. 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.
8. Plug the bed power cord into the wall socket and verify the back and bed lift limits are set properly before
returning the bed to service.
NOTE
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”.