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-   -   Bernina 540 Footpedal wiring etc. (https://www.quiltingboard.com/vintage-antique-machine-enthusiasts-f22/bernina-540-footpedal-wiring-etc-t309393.html)

joolstacho 01-23-2020 07:01 PM

Bernina 540 Footpedal wiring etc.
 
My 540 has speed controller electronic components built into a casing beneath the motor.
There's a larger silver capacitor (about the size of an AA battery) and 2 smaller black ones about 1/2" long that are in the motor lines. There's a separate power-in plug, and a separate footpedal plug.
I'm familiar with the old type footpedal which contains simple mechanical variable resistors, but what sort of foot control would work with this setup?

quiltedsunshine 01-23-2020 09:12 PM

Is it so you can use the knee lever to power it? Instead of the foot pedal?

joolstacho 01-23-2020 09:30 PM

Well I don't think so Annette, because there's no physical connection or electrical connection to the knee lever.
And the machine has the 2-prong electrical connector socket in the base which obviously is supposed to connect to a footpedal (that I don't have).

quiltedsunshine 01-24-2020 06:12 AM

This is the foot control we use, and attach to the Bernina cord at the shop. Part #072963 Singer 1116 2662 with 771 cord Here's the same foot control that's connected to the cord, at a great price. https://www.ebay.com/itm/Complete-El...-/321973575036 The cord by itself retails for $45! Last time I checked Ebay for these, they were selling for $100.

joolstacho 01-24-2020 02:23 PM

Here's a pic of my machine. Note the 2 plug sockets, on the right (rear of machine) the power cord socket, 2 flat pins male prongs.
And (I assume the footpedal) (front) socket on the left, 2 round pins - female sockets. The one you link on ebay wouldn't fit either of the plugs with the cord shown. Though perhaps you have a cord that fits the Bernina and that footpedal? Interesting! Thanks Annette.

Mickey2 01-24-2020 03:27 PM

I think it's only the capacitor that's connected to the plug socket in the machine. The carbon resistors and everything else is in the pedal. The most common replacement capacitor is a small squarish thing, but you have to check for the correct US replacement. It's probably different from the European 220 voltage. Some of the early Berninas have a small simple circuit board in connection with it, and it's easily replaced too

joolstacho 01-24-2020 03:41 PM

Here's a pic of my machine. Note the 2 plug sockets, on the right (rear of machine) the power cord socket, 2 flat pins - male prongs.
And (I assume the footpedal) (front of machine) socket, 2 round pins - female sockets. The one linked on ebay wouldn't fit either of the plugs. Interesting! Thanks Annette and Mickey.
(Btw I'm in Australia).

Mickey2 01-24-2020 04:48 PM

It looks very similar to my 730, it should look something like this.

joolstacho 01-24-2020 05:16 PM

That sure looks right Mickey. Helps to see one to know what to look for. Thanks.

joolstacho 01-25-2020 03:26 PM

Just to tie this one up, I've hotwired the 540 (made up plug adaptors to fit) and I can confirm that a good ol' fashioned mechanical rheostat type footpedal works just fine, The 540 purrs like a kitten, stitches pretty well, and has a good turn of speed too.


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