627 Chair Troubleshooting Chart

Chair Has No Power

Symptom	Cause	Check	Action
No functions will operate.	Supply voltage.	Check power cord connections.	Secure power cord connections at wall outlet and/or chair base.
		Check facility circuit breaker.	Reset facility circuit breaker.
		Check facility supply voltage.	Contact electrician to modify voltage if necessary.
	Primary fuse(s) blown.	Test fuses at chair base.	Replace blown fuse.
	Loose wire connections.	Check wire connections between power inlet and Motor Control PC board.	Secure loose wire connections.
	Loose wire connections.	Check wire connections between power inlet and isolation transformer.	Secure loose wire connections.
	Step Down transformer.	Check Step Down transformer output voltage (115 VAC).	Replace faulty Step Down transformer.

Base and Back functions not operating properly

Symptom	Cause	Check	Action
No Base or Back functions.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Foot Control Cord	Secure foot control inlet harness connections.
	Primary fuse(s) blown.	Test fuses at chair base.	Replace blown fuse. Refer to: Base and Back Functions / Fuses and Connections
	Motor Control PC board fuse(s) blown.	Test F1 and F2 fuses.	Replace blown fuse. Refer to: Base and Back Functions / Fuses and Connections
	Overtravel limit switch.	On Motor Control PC board J3 connection jump orange wires for overtravel limit switch. Refer to: Base Function Fuses and Connections	Replace defective limit switch. Refer to: Base Function Components
	Loose overtravel limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch.	Secure loose wire connections.

Base function not operating properly

Symptom	Cause	Check	Action
Chair stops and beeps.	Patient weight exceeded 500 lbs.	Check if patient weight exceeded the 500 lb. weight limit.	Inform staff that maximum patient weight is 500 lbs.
	Active Sensing Technology™ activated.	Check if chair came in contact with another object.	Remove object from beneath drawer.
	Active Sensing Technology™ switch(es).	On Motor Control PC board J4 connection jump white wires for AST switches. Refer to: Base Function Fuses and Connections	Replace defective switch(es). Refer to: Active Sensing Technology™ Switches
	Loose Active Sensing Technology™ switch wire connections.	Check wires connections between Motor Control PC board and AST switches. Refer to: Base Function Fuses and Connections	Secure loose wire connections. Refer to: Active Sensing Technology™ Switches
No Base up or Base down.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Base Function Fuses and Connections	Secure foot control inlet harness connections.
	Motor Control PC board fuse(s) blown.	Test F1 and F2 fuses. Refer to: Base Function Fuses and Connections	Replace blown fuse(s).
	Base up/down limit switch(es).	On Motor Control PC board J5 connection jump black/black and white/white wires for Base limit switches. Refer to: Base Function Fuses and Connections	Replace defective limit switch(es). Refer to: Base Function Components
	Loose Base up/down limit switch wire connections.	Check wires connections between Motor Control PC board and limit switches. Refer to: Base Function Fuses and Connections	Secure loose wire connections.
	Overtravel limit switch.	On Motor Control PC board J3 connection jump orange wires for overtravel limit switch. Refer to: Base Function Fuses and Connections	Replace defective limit switch. Refer to: Base Function Components
	Loose overtravel limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Base Function Fuses and Connections	Secure loose wire connections.
	Motor Control PC board.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller. If movement, Refer to: Base Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Base actuator motor.	Perform Base actuator motor resistance test. Refer to: Base Actuator Motor Resistance Test	Replace defective motor. Refer to: Base Function Components
	Base actuator.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller, if no movement. Refer to: Base Actuator Test	Replace defective Base actuator. Refer to: Base Function Components
No Base up or Base down, motor is running.	Base actuator motor coupler.	Inspect motor coupler for damage. Refer to: Base Function Components	Replace defective motor coupler. Refer to: Base Function Components
No Base up, Base down OK.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Base Function Fuses and Connections	Secure foot control inlet harness connections.
	Base up limit switch.	On Motor PC board J5 connection jump white wires for Base up limit switch. Refer to: Base Function Fuses and Connections	Replace defective limit switch. Refer to: Base Function Components
	Loose Base up limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Base Function Fuses and Connections	Secure loose wire connections.
	Motor Control PC board.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller, if movement. Refer to: Base Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Base actuator motor.	Perform Base actuator motor resistance test. Refer to: Base Actuator Motor Resistance Test	Replace defective motor. Refer to: Base Function Components
	Base actuator.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller, if no movement. Refer to: Base Actuator Test	Replace defective Base actuator. Refer to: Base Function Components
No Base down, Base up OK.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Base Function Fuses and Connections	Secure foot control inlet harness connections.
	Base down limit switch.	On Motor Control PC board J5 connection jump black wires for Base down limit switch. Refer to: Base Function Fuses and Connections	Replace defective limit switch. Refer to: Base Function Components
	Loose Base down limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Base Function Fuses and Connections	Secure loose wire connections.
	Active Sensing Technology™ activated.	Check if chair came in contact with another object.	Remove object from beneath drawer.
	Active Sensing Technology™ switch(es).	On Motor Control PC board J4 connection jump white wires for AST switches. Refer to: Base Function Fuses and Connections	Replace defective switch(es). Refer to: Active Sensing Technology™ Switches
	Loose Active Sensing Technology™ switch wire connections.	Check wires connections between Motor Control PC board and AST switches. Refer to: Base Function Fuses and Connections	Secure loose wire connections. Refer to: Active Sensing Technology™ Switches
	Motor Control PC board.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller. If movement, Refer to: Base Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Base actuator motor.	Perform Base actuator motor resistance test. Refer to: Base Actuator Motor Resistance Test	Replace defective motor. Refer to: Base Function Components
	Base actuator.	Move J2 to J1 connector on Motor Control PC board. Use Back function on controller. If no movement, Refer to: Base Actuator Test	Replace defective Base actuator. Refer to: Base Function Components

Back function not operating properly

Symptom	Cause	Check	Action
Chair stops and beeps.	Patient weight exceeded 500 lbs.	Check if patient weight exceeded the 500 lb. weight limit.	Inform staff that maximum patient weight is 500 lbs.
No Back up or Back down.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Back Function Fuses and Connections	Secure foot control inlet harness connections.
	Motor Control PC board fuse(s) blown.	Test F1 and F2 fuses.	Replace blown fuse(s).
	Back up/down limit switch(es).	On Motor Control PC board J4 connection jump grey/grey and white/white wires for Back limit switches. Refer to: Back Function Fuses and Connections	Replace defective limit switch(es). Refer to: Back Function Components
	Loose Back up/down limit switch wire connections.	Check wires connections between Motor Control PC board and limit switches. Refer to: Back Function Fuses and Connections	Secure loose wire connections.
	Overtravel limit switch.	On Motor Control PC board J3 connection jump orange wires for overtravel limit switch. Refer to: Back Function Fuses and Connections	Replace defective limit switch. Refer to: Base Function Components
	Loose overtravel limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Base Function Components	Secure loose wire connections.
	Motor Control PC board.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller. If movement, Refer to: Back Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Back actuator motor.	Perform Back actuator motor resistance test. Refer to: Back Actuator Motor Resistance Test	Replace defective motor. Refer to: Back Function Components
	Back actuator.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller, if no movement. Refer to: Back Actuator Test	Replace defective Back actuator. Refer to: Back Function Components
No Back up or Back down, motor is running.	Back actuator motor coupler.	Inspect motor coupler for damage. Refer to: Back Function Components	Replace defective motor coupler.
No Back up, Back down OK.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to: Back Function Fuses and Connections	Secure foot control inlet harness connections.
	Back up limit switch.	On Motor Control PC board J4 connection jump grey wires for Back up limit switch. Refer to: Back Function Fuses and Connections	Replace defective limit switch. Refer to: Back Function Components
	Loose Back up limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Back Function Fuses and Connections	Secure loose wire connections.
	Motor Control PC board.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller. If movement, Refer to: Back Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Back actuator motor.	Perform Back actuator motor resistance test. Refer to: Back Actuator Motor Resistance Test	Replace defective motor. Refer to: Back Function Components
	Back actuator.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller. If no movement, Refer to: Back Actuator Test	Replace defective Back actuator. Refer to: Back Function Components
No Back down, Back up OK.	Foot control malfunctioning.	If possible, use known working Foot control from another like chair. If known working control operates chair.	Replace faulty Foot control.
	Foot control malfunctioning.	Perform Foot control cord test. Refer to: Foot Control Cord	Replace faulty Foot control cord.
	Loose foot control inlet harness connection.	Check inlet harness connections at Motor Control PC board and chair base. Refer to:Back Function Fuses and Connections	Secure foot control inlet harness connections.
	Back down limit switch.	On Motor Control PC board J4 connection jump white wires for Back down limit switch. Refer to: Back Function Fuses and Connections	Replace defective limit switch. Refer to: Back Function Components
	Loose Back down limit switch wire connections.	Check wires connections between Motor Control PC board and limit switch. Refer to: Back Function Fuses and Connections	Secure loose wire connections.
	Motor Control PC board.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller. If movement, Refer to: Back Function Motor Control PC Board Test	Replace defective Motor Control PC board.
	Back actuator motor.	Perform Back actuator motor resistance test. Refer to: Back Actuator Motor Resistance Test	Replace defective motor. Refer to: Back Function Components
	Back actuator.	Move J1 to J2 connector on Motor Control PC board. Use Base function on controller. If no movement, Refer to: Back Actuator Test	Replace defective Back actuator. Refer to: Back Function Components

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627 Chair Troubleshooting Chart