It is normal on an ARXA, so I wouldn't be too surprised. Something about the way the starting system (switch/ capacitor,etc.)is wired. Sorry, I'm no expert on the Phillips though.
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If the switch is in the power line and actually breaks the connection, there should be nothing at the motor. Maybe they have a capacitor across the switch, that is starting to short, or leak, and is passing some AC power to it all the time. This capacitor would most likely be used to filter a turn on/off pop through the system, I believe.
Thanks, I did replace the capacitor that goes across the switch, but it didn't make a difference. I have since been told by another person who checked their 437, that its motor also had some vibration when switched off. I have also been told that it is a normal " trait " of at least some synchronous AC motors.