647 Chair Power to the Chair Troubleshooting
Standard Base Models
This illustration shows only the components that affect all chair functions. A detailed description of the power supply to the chair appears below.
•If power light is OFF, there is no power to PC board. If power light is ON, proper voltage is present at PC board.
•Black and white wires supply 48-54 VAC to power circuitry for the Base and Back actuators
•Red and orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors
Facility Supply Voltage
With the chair's power cord properly connected, facility supply voltage, 115 VAC is supplied thru the cord to the power inlet.
Power Inlet
The voltage setting displayed in the power inlet window must match facility supply voltage , 115 VAC.
Current flows thru two fuses in the power inlet, to the main system transformer.
Main System Transformer
This transformer is protected from overload by a thermal cutout feature. This will automatically reset when the transformer cools.
Line voltage (115 VAC) is supplied to the main system transformer. The transformer reduces the voltage and current flows to the main PC board thru two separate windings, four wires.
•The black and white wires supply 48-54 VAC to power circuitry for the Base and Back actuators only.
•The red and orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors.
Power Indicator Light
When voltage is applied to the PC board, the power light is illuminated.
Main PC Board
Circuitry on the PC board provides the required voltage to power all of the chairs components: foot control, actuators, limit switches, and position sensors.
Foot Control / Touch Pads
Circuitry on the main PC board supplies 8-10 VAC to the foot control and touch pads.
Rotational Base Models
This illustration shows only the components that affect all chair functions. A detailed description of the power supply to the chair appears below.
•If power light is OFF, there is no power to PC board. If power light is ON, proper voltage is present at PC board.
•Black and white wires supply 48-54 VAC to power circuitry for the Base and Back actuators.
•Red and orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors.
Facility Supply Voltage
With the chair's power cord properly connected, facility supply voltage, 115 VAC, is supplied thru the cord to the power inlet.
Power Inlet / EMI Filter Board
The voltage setting displayed in the power inlet window must match facility supply voltage , 115 VAC.
Current flows from the power inlet thru the EMI filter board, then back thru the power inlet fuses to the rotational base PC board.
Rotational Base PC Board
Current flows thru the rotational base PC board to the main system transformer. The transformer reduces the voltage and current flows back to the rotational base PC board.
•Circuitry on the rotational base PC board provides the required voltage to power the rotational base brake system.
•The reduced voltage is supplied to the main PC board thru the rotational base PC board.
Main System Transformer
This transformer is protected from overload by a thermal cutout feature. This will automatically reset when the transformer cools.
Line voltage, 115 VAC, is supplied to the main system transformer thru the rotational base PC board. The transformer reduces the volt age and current flows back to the rotational base PC board, then to the main PC board thru two separate windings, four wires.
•The black and white wires supply 48-54 VAC to power circuitry for the Base and Back actuators only.
•The red and orange wires supply 34-37 VAC to power circuitry for the Tilt actuator, foot control, touch pads, power light, all limit switches, and position sensors.
Power Indicator Light
When voltage is applied to the PC board, the power light is illuminated.
Main PC Board
Circuitry on the PC board provides the required voltage to power all of the chairs components: foot control, actuators, limit switches, and position sensors.
Foot Control / Touch Pads
Circuitry on the main PC board supplies 8-10 VAC to the foot control and touch pads.
