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Foot control does not work only on full speed

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  • Sewing Machines Master
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REPLACE THE FOOT CONTROL, THE VARIAC IS DEFECTIVE IN IT.

Posted on Jun 29, 2009

  • orchestradam Nov 04, 2010

    Most likely the suppressor capacitor has gone short circuit. A replacement can cost less than £1.00. It's connected between the two leads inside the foot controller. You can check the old capacitor by disconnecting it and seeing if a torch bulb will light up when connected in a triangle with it and a 6-volt battery. If the bulbs lights up, the capacitor is dead! Try Maplin for a replacement.

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unplug the foot controller to eliminate it as the problem ,however if the machine does not run like mad as soon as you switch it on
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I have acquired a necchi automatic supernova. I want to know how to install a foot pedal - it never came with one. It did come with a sewing motor controller (dark brown/black block with two cables leading...


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Turn the machine on, press the foot control down and turn the handwheel backwards. If it sputters, the motor carbon brushes are worn to the springs and need replacing.

Next, while pressing on the foot control, try wiggling the wires around where it enters to machine and where it enters the foot control. There may be a short in the cord. If the short is at the machine, you need a new cord. If it is at the foot control, the cord can be pulled into the foot control, the shorted part cut off and the connection reattached.

If it still doesn't work, try removing the cord from the machine and placing an alligator clip test lead to two of the inlet prongs on plugging it into power. Which two prongs you ask? Try several combinations, (one will light up the lamp) CAREFUL: THE MACHINE MAY SUDDENLY TAKE OFF AT FULL SPEED, SO REMOVE THE BOBBIN, THE THREAD AND NEEDLE FIRST. if it runs, it is your foot control. If it doesn't run, it's likely the motor brushes or motor.

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well particular on electrical problem foot control is a switch of motor that deliver speed varies on how you press the foot pedal it consist of circular thick plate carbon the old model and the new one electronically control of power ic,It depend on how this pedal was contro.Anyway besure the power is off or unplug the machine; this control was been connected in series connection to the motor which you can test if your foot pedal control is defective. Disconnect the line wire holding foot pedal from the terminal inside motor assembly.If your not qualified electrician don.t do this.Connect the two terminal wire that inside the machine where the motor mounted.This connection is supplying your motor in full speed,Declucth your machine from the handwheel so that the motor run only.Plug the machine and switcn but you must jug only if the motor run in couple second of course without the foot control this was disconnected already.So your foot control is defective vice versa if motor does not run without foot control motor is busted.
how to fix if foot contol is defective, in carbon type you must replcace the circular thick carbon.On Electronic control check the IC if this open or some capacitor and resistor are open,Replaced any pars that had been short circuited.If the motor is defective replaced the carbon brush mounted at two side of motor case,There is an opening port.The carbon brush has spring holding push this carbon brush to the brush armature of rotor.

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sounds like the contact in the foot peddle has failed try a new peddle

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I've just fixed this problem by replacingthe main capacitor in the foot pedal. I have a Bernina 830. I needed a soldering iron, and I had to buy the right capacitor, but it fixed this exact problem. Btw, a few months ago this problem initially appeared (on my machine) as an issue where the speed was either zero, or full speed). After a white it wouldn't work at all.

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You could have several problems, so go see a qualified Husqvarna repairman. You may contact Husqvarna customer service to locate the best one in your area.

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