This illustration shows the Tilt Down Limit Switch and the three serviceable components of the tilt actuator. Use the table below to isolate the malfunction.

Problem	Required Action
Motor runs, but makes grinding noise.	Clean / lube actuator threads. Replace actuator if necessary.
Motor runs, but table does not move.	Inspect / replace motor coupler.
Motor does not run.	Perform Position Sensor Test at Tilt Sensor. (Up only) Perform Limit Switch Test. (Down only) If OK, Perform Actuator Motor Test (Up / Down).

There is only one limit switch for the Tilt function. The upper limit is controlled by the Tilt position sensor.

1.Disconnect harness from J11 on main PC board

2.Place one meter probe on the common (white).

3.Place other probe on the Tilt Down limit switch wire (red).

Tilt Down Switch untripped
Meter Reading	Required Action
OL	Perform Limit Switch / Harness Test.
less than 10 Ω	Limit switch / harness OK, Perform Actuator Motor Test.

Tilt Down Switch tripped
Meter Reading	Required Action
less than 10 Ω	Perform Limit Switch / Harness Test.
OL	Limit switch / harness OK, Perform Actuator Motor Test.

1.Unplug the appropriate limit switch harness.

2.Measure continuity,

Meter reading should be
Actuator Full Up	White to Black - Open White to Red - Closed
Actuator Full Down	White to Black - Closed White to Red - Open
Actuator Midway Point	White to Black - Closed White to Red - Closed

1.Tag and disconnect wires from switch.

2.Place meter probes on COM and NC terminals.

With Switch Tripped
Meter Reading	Status	Required Action
OL		Limit switch OK
less than 5 Ω		Replace switch

With Switch Untripped
Meter Reading	Status	Required Action
OL		Replace switch
less than 5 Ω		Limit switch OK, Perform Actuator Motor Test

1.Tag, then disconnect tilt actuator wires J7 and J8.

2.Place meter probes on actuator wires. Check meter reading.

Meter Reading	Status	Required Action
1 to 10 Ω		Actuator motor OK. Perform Motor Ground Test.
OL or less than 1 Ω		Replace motor*.

1.Place one meter probe on actuator wire J7. Place other meter probe on PC board ground wire. Check meter reading. Repeat for J8.

Meter Reading	Status	Required Action
OL -or-more than 1 MΩ		Motor harness OK. Perform PC Board Test.
less than 1 Ω		Replace motor*.

1.This test cannot be performed with the tilt function in the max. or min. position. If necessary, reposition the tilt function. Refer to: Foot Actuator - PC Board Test.

2.Move the Foot section halfway between the max. and min. positions.

3.Tag, then disconnect tilt actuator wires from J7 and J8.

4.Move wire from J6 to J7. Move wire from J5 to J8.

5.Press and hold Tilt Up button for 5 seconds. Does the foot section move up, then stop and beep? If Yes, go to Step 6. If No, replace PC Board.

6.Press and hold Tilt Down button for 5 seconds. Does the foot section move down, then stop and beep? If Yes, PC Board is OK. If No, replace PC Board.