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62
2030-809-002 REV D
www.stryker.com
CPU BOARD REMOVAL AND REPLACEMENT
Tools Required:
•
T27 Torx
•
Needle-Nose Pliers
Procedure:
1. Run the litter to the full up position and remove the mattress from the bed.
2. Fold the foot section back toward the head end of the bed. Electrically run the knee section to full up. If the knee
section will not move electrically, pull the foot section toward the head end of the bed while pulling the CPR release
handle (located at the head end of the bed). The knee section will raise.
3. Using a T27 Torx, remove the four screws holding the cover to the actuator box and remove the cover.
4. Properly ground yourself (Refer to Static Protection Procedure).
5. Unplug all electrical connections from the CPU board.
6. Press the six stand off away from the board while gently lifting the board up and out.
7. Install the replacement CPU board.
Note
After the replacement CPU board is installed, a “burn-in” procedure must be performed for the Fowler and lift motor
potentiometers (Refer to Lift Potentiometer “Burn-in” Procedure and Fowler Potentiometer “Burn-in” Procedure).
If the bed is equipped with a scale system, the scale calibration procedure must also be performed after the replacement
CPU board is installed (Refer to Scale System Diagnostics and Calibration procedure).
Service Information
FOWLER POTENTIOMETER REPLACEMENT
Tools Required:
•
T27 Torx
•
Wire Cutters
•
1/2” Open End Wrench
•
7/64” Allen Wrench
Procedure:
1. Manually crank the knee section up until it stops.
2. Using a T27 Torx, remove the four screws holding the litter access cover to the litter and remove the cover.
3. Using a 7/64” Allen wrench, loosen the screw holding the linkage to the potentiometer shaft and remove the linkage
from the shaft.
4. Using a 1/2” open end wrench, remove the nut holding the potentiometer to the frame.
5. Using wire cutters, remove the cable ties from the cable. Unplug the cable from the CPU and remove the
potentiometer.
6. Reverse the above procedure to install the replacement potentiometer.
7. The new potentiometer must be calibrated after it has been installed.
8. The Fowler potentiometer should be set at 150Ω (±10Ω) in the full down position. This reading must be taken from
pins 3 and 4 on the connector with the potentiometer unplugged from the board. After the correct ohm reading is
achieved, tighten the screw on the linkage.
Summary of Contents for EPIC II
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