SOURCE: step motor error
I am working on a 6003Q right now with this exact problem. The shuddering sound is the stepper motor working, but hitting the movement limit stop. The reason it keeps trying to move is that the sensor has failed. In the case of the machine I am working on, it is the zig-zag stepper motor position sensor that has failed. Elna does not sell the sensor separately, it comes complete with stepper motor, mounting frame, and cable, which is a shame because it is approx. $70 dealer cost for the assembly. The sensor is nothing more than an LED as a "sender" with a corresponding "receiver". There is a blade on the stepper motor drive gear that passes between the two and breaks the beam signaling that the "home" position has been reached. Unfortunately, the sender-receiver pair are sealed in a plastic housing so they are not replaceable. The part number of the zig-zag stepper motor assembly is 395727-69.
Best of luck,
Rick
SOURCE: how much warranty is there on a 8600 elna sewing
according to www.elna.com.au they offer 5 year warranty on their machines.
SOURCE: what bobbin size for elna supermatic 722010
Elna Supermatic 722010 is a very vintage elna and would take the metal 7 hole dished bobbin like this.
Don't try to use any other bobbin in it, and always load and wind with the holes on top.
You can still buy these; one supplier is sewingpartsonline, here is like to the item
http://www.sewingpartsonline.com/bobbins-elna-426000-10pk.aspx
was the machine serviced before you bought it?
one thing about computers is one minute they can be working & the next
minute they can go out.
you mentioned the machine was making a clicking noise, & it's not
suppose to be.
check the usb port to make sure the computer is tranfering the information
correctly
are the cords connected correctly?
when was the last time the machine was serviced
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After converting the .jef to a .hus, then back again to a .jef, my machine finally recognized the file!
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