It looks like “model 6400” could refer to different devices depending on context — for example, vacuum cleaners, blood pressure monitors, or other electronics. To give you accurate advice, could you let me know which product you’re referring to? For instance:
Is it a vacuum cleaner (like a Riccar or other brand)?
A blood pressure monitor or related health device?
I would contact the manufacturer for advice.
Old Question.
Not answered because no information given. It sounds like a blood pressure monitor only because you mention 'cuff. All questions need full 'make model (what it is)'.
https://www.google.com/search?q=model+6400
Google: make model replacement cuff.
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SOURCE: I have Forecare blood pressure
IT seems the pump motor has gone bad. Or the motor capacitor is defective. Give me some time. I will update you in an hour.
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