This is usually one of two things. You will need to pry the on/off button away from the joystick for inspection. Use a utility knife to get under the edge and pry it off.
The back of the rubber button is coated with a material that conducts electricity so that when you press it, it makes contact with the surface under it which is also conductive. 1. For older chairs that get a lot of on/off use, this metalic coating on the back of the switch can wear away and not make good contact with the base. Examine the back of the on/off button for wear; you will see the rubber under the metalic coating if it is worn. Pressing around the edges of the button might work to get it on and off, or pressing harder. Otherwise, you need to paint on a new coating. Here is a site that sells that product.
2. If you have spilled something on the joystick that has fouled the connection here, it will have a hard time making contact to turn on and off. Clean with alcohol and cotton swabs, let dry and see if that does the trick.
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This is usually one of two things. You will need to pry the on/off button away from the joystick for inspection. Use a utility knife to get under the edge and pry it off.
The back of the rubber button is coated with a material that conducts electricity so that when you press it, it makes contact with the surface under it which is also conductive.
1. For older chairs that get a lot of on/off use, this metalic coating on the back of the switch can wear away and not make good contact with the base. Examine the back of the on/off button for wear; you will see the rubber under the metalic coating if it is worn. Pressing around the edges of the button might work to get it on and off, or pressing harder. Otherwise, you need to paint on a new coating. Here is a site that sells that product.
http://www.newark.com/chemtronics/cw2605/conductive-chemical-coating-3g/dp/00Z1875?mckv=sskjVGufT'pcrid'57087234861'plid'&CMP=KNC-GPLA
2. If you have spilled something on the joystick that has fouled the connection here, it will have a hard time making contact to turn on and off. Clean with alcohol and cotton swabs, let dry and see if that does the trick.