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wrong polarity?

yes not very good at this the m/c in question is a Marcy cross trainer unfortunately there is no model number on m/c, the power is a 6ooma plug set at 9v but had polarity wrong way round now tension not working hope this is better info
jeff (plonker), April 2018
Assuming the power supply has not failed, you have probably blown something inside the machine.
An expensive lesson learned in not fiddling.
Do you know a **technically competent** person who could check?

ghgfd, April 2018