Hello -
Apparently the Jones vx780 model is the same as the Brother vx780 model. Brother acquired Jones in 1968.
This is the link to a free PDF of the manual for the Brother vx780:
https://www.manualslib.com/manual/22149/Brother-Vx780.html
You will need Adobe Acrobat Reader software (free). After downloading the manual, be sure to save it to your computer using a file name you can easily find again in your Documents folder.
Best wishes.
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