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"Whirring" noise when recording from mic on MZ-R70

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Guest Anonymous

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Guest Anonymous

Hi, having a problem with my minidisc and I hope someone can help.

When I record from the mic input and am running on battery power (fully charged), I get a sort of mechanical whirring sound every few seconds in my recordings. This coincides with the disc motor activity, but it is not being picked up through the microphone. In fact, I can turn the switch on the mic off and record dead air, and when I play it back I'll get the whirring noise recorded so I'm sure it is being picked up internally somehow.

If I plug the unit into the power adapter, I don't get this whirring motor noise, but there is a very faint, high pitched sound at regular intervals mixed in with my recordings. (about every 3-5 seconds). This isn't as bad as the motor sound, but is still annoying on quiet passages.

If I record into the line input, I have no problems whatsoever. It only appears to be related to the mic input.

Anybody experienced something similar? I purchased this unit second hand to make some recordings of solo acoustic guitar. This whirring noise renders the unit useless for that, unless I go with an external preamp and use the line input.

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