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18 2030-809-002 REV D www.stryker.com
Problem / Failure Recommended Action
No bed down motion.
A. Enter diagnostics, (Refer to Scale System Diagnostics
and Calibration section) and press bed down.
a. If motion is not present, verify there is a two pin
shunt present on connector Y, closest to the center
of the bed, if not, install shunt.
1. Test bed down motion, if motion is present
then go to step D.
b. If motion is present, reburn lift potentiometer
limits, Refer to Lift Potentiometer Replacement
and Adjustment section for procedure.
B. Check for 5 VDC on TP 9 (HL) and TP 7 (FL) referencing
ground test point while pressing bed down.
a. If 5VDC is present, go to step C.
b. If 5VDC is not present, replace CPU board.
C. Check for 120VAC power on connector N (HL) and G
(FL), pin 1 (white) and pin 3 (black), of the CPU board,
while pressing bed motion up.
a. If voltage is not present, replace CPU board.
b. If voltage is present:
1. Verify the motors are running, if so, replace
lift couplers.
2. If motors are not running, check voltage at
motor connection.
3. If voltage is present at motor, check capacitors
or motors.
D. Verify bed function and return to service.
No bed up motion. A. Enter diagnostics, (Refer to Scale System
Diagnostics and Calibration section) and press
bed up.
a. If motion is not present, go to step B.
b. If motion is present, reburn lift potentiometer
limits, refer to Lift Potentiometer Replacement
and Adjustment section for procedure.
B. Check for 5VDC on TP 10 (HL) and TP 8 (FL) on
the CPU board referencing ground test point while
pressing bed up.
a. If 5VDC is present, go to step C.
b. If 5VDC is not present, replace CPU board.
C. Check for 120VAC power on connector N (HL) and
G (FL), pin 1 (white) and pin 6 (red), of the CPU
board while pressing bed motion up.
a. If voltage is not present, replace CPU board.
b. If voltage is present:
1. Verify the motors are running, if so, replace
lift couplers.
2. If motors are not running, check voltage at
motor connection.
3. If voltage is present at motor, check
capacitors or motors.
D. Verify bed function and return to service.
Troubleshooting Guide
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