646 Chair Power to the Chair Troubleshooting
The illustrations show only the components / wiring that affect all chair functions.
Serial Number Range: V2200 thru V1977127
The 646 has two power cords. One cord supplies voltage to the main PC board. The other cord (not shown) supplies voltage to the chair receptacles.
Facility Supply Voltage / Main PC Board
With the chair’s power cord properly connected, facility supply voltage (115 VAC) is supplied to the main PC board. Current flows thru the two primary fuses (F1 and F2) to the transformer on the PC board. F4 fuse protects the transformer.
The transformer reduces the line voltage and supplies 14 VAC to the foot control and the two touch pads.
Power Indicator Light
When voltage is applied to the PC board, the power light is illuminated.
Foot Control / Touch Pads
Circuitry on the main PC board supplies 14 VAC to the foot control and touch pads.
Serial Number Range: V1977128 thru Present
The 646 has two power cords. One cord supplies voltage to the Power / QuickChair PC board. The other cord (not shown) supplies voltage to the chair receptacles.
Facility Supply Voltage / Power / QuickChair PC board / Motor Control PC Board
With the chair’s power cord properly connected, facility supply voltage (115 VAC) is supplied thru two primary fuses (F1 and F2) on the Power / QuickChair PC board. Current then flows thru an EMI Filter to the Motor Control PC board. Fuse F1 on the Motor Control PC board protects the Back and Tilt actuator motors. Fuse F2 on the Motor Control PC board protects the transformer on the Motor Control PC board and the electronics supplied by the transformer. The Motor Control PC board also supplies 3.3 VDC to the foot control and the two touch pads via J4 and J5 on Power / QuickChair PC board.
Power Indicator Light
When voltage is applied to the Power / QuickChair PC board, the power light is illuminated.
