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Troubleshooting
Cot legs are retracted, but the cot is not lifted by the lifting arms when you press
the retract (-) button
1. Make sure that the trolley is on and functions without errors.
2. Make sure that the cot and trolley communication modules are connected, undamaged, and working properly.
a. Try the cot with a know good Power-LOAD.
b. Try the trolley with a known good cot.
3. Check all cable connections associated with communication leading back to the control board.
4. Replace the communication board (6390-001-378 or 6500-002-100).
5. Replace the control board assembly (6390-001-014 or 6500-002-014).
Cot is lifted by the lifting arms but the cot legs do not retract when you press the
retract (-) button
1. Check the support sensor (6390-001-397) on the trolley.
2. Check the cable and connections to the control board.
3. Check for an error on the trolley control panel. If there is an error, call Stryker Service.
4. Check the cot by itself for proper functionality.
5. Make sure that the cot indicates a good battery and no errors are present on the cot LCD. If you have an error,
replace the battery.
6. Press the retract (-) button on the cot.
a. If you hear the cot pump motor run, the issue is a stuck rod-side manual valve (patient left manual valve) on the
cot.
7. Check for a faulty pressure switch by removing the pressure switch connection from the cot main cable at the end
closest to the hydraulics.
a. Jumper the cable to simulate a closed switch and press the retract (-) button.
b. If you do not hear the motor, the issue is either with cable connections or a bad pump motor.
c. Fix the connection or replace the pump motor.
8. Check the cot control board (6390-101-014) and replace, if necessary.
Trolley lifts the cot too slowly when you press the retract (-) button
1. Make sure that the trolley battery voltage is >12.2V DC.
a. If the battery is charged and the voltage is < 10.0V DC when you press the retract (-) button, replace the trolley
battery.
2. Check for an error on the trolley control panel LEDs while moving the lifting arms with the trolley control panel.
a. If an error is active only when using the lifting arms, replace the support sensor (6390-001-452).
3. Replace the hydraulics assembly (6390-001-039).
4. Replace the control board assembly (6390-101-014).
Lifting arms lift the cot too quickly when you press the retract (-) button
1. Check for a faulty or broken support sensor cable (6390-001-452).
2. Check for a faulty cabling connection to the control board.
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