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It sounds like there may be an issue with the motor that drives the paper feed mechanism. The hum/buzz that you hear when you turn it on could be the motor trying to start but failing to do so. The tightness of the paper feed could also be related to the motor issue.
The green "E" on the screen likely indicates an error. Without more specific information about the error code, it's difficult to determine the exact issue. However, it's possible that the error code is related to the motor or paper feed issue.
If you're comfortable doing so, you may want to try opening up the machine to see if there are any obvious issues with the motor or paper feed mechanism, such as a loose or broken part. If you're not comfortable doing this or if you're unable to identify the problem, it may be best to take it to a professional for repair.
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What sort of hum? Very quiet? Loud with vibration? Have you tried feeding anything else into the unit? Envelope? It's possible that you're not pushing the paper far enough in to let the shredder's teeth grab it.
Feed the paper through the slot located just under where the roll is sitting. Once you have fed it through as far as you can, press the arrow button (the up arrow) on your calculator until it catches the paper & feeds it through the machine.
It could be one of two problems and they are both usually caused by over feeding. Either the tooth rollers have junped out of their sockets or they are jammed tight with paper which would cause the first to happen also. There are safety switches but unplug the unit any way. Get on the output side of the shreeder and start pulling paper or remove the metal object that was dropped into its throat. Hopefully, you won't have to take it apart to put the rollers back into their sockets.
Probably a bad mag, if the transformer goes bad it will draw a lot of amps and blow the fuse. If a mag shorts it just makes a more pronounced hum. Same with the rectifier. If you Ohm out the rectifier it should show open both ways as it is a really high resistance and the only way it would make a louder hum is if it shouts. so If it looks open it is probably OK, and probably bad mag. .
Things that are not broken: The big relay that powers the compressor often hums or buzzes when the unit is running. Several brands of heat pumps keep their reversing valve "on" any time the thermostat is set for "cool". They buzz, too.
If something really is loose, the only way to fix it is to look at the machine and take off panels until you find what is buzzing.