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The most likely cause is the lock. &nbsp;At the back of the scanner, near where the power plug is you'll find a lever. &nbsp;Move it toward the side of the scanner. &nbsp;<br />
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If you've done that, disconnect the power, push the lever back in to lock it and then ut to unlock it again. &nbsp;If the grinding noise persists, the scanner is defective and you should return it to the dealer for exchange or call HP for service.<br />
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Good Luck, John
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The most likely cause is the lock.  At the back of the scanner, near where the power plug is you'll find a lever.  Move it toward the side of the scanner.  

If you've done that, disconnect the power, push the lever back in to lock it and then ut to unlock it again.  If the grinding noise persists, the scanner is defective and you should return it to the dealer for exchange or call HP for service.

Good Luck, John

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I have a 6350C scanjet. &nbsp;This grinding noise only comes on when I scan at 1200 dpi. &nbsp;I suspect this is a design problem as I had tried two identical scanners and had the same result, ie. noise came on 1200 dpi but NOT 900 or 2400 dpi. &nbsp;It does not sound a problem with the lock if the scanned image appeared normal.
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I have a 6350C scanjet.  This grinding noise only comes on when I scan at 1200 dpi.  I suspect this is a design problem as I had tried two identical scanners and had the same result, ie. noise came on 1200 dpi but NOT 900 or 2400 dpi.  It does not sound a problem with the lock if the scanned image appeared normal.

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I had a brand new 6300cxi scanner, working very nice. &nbsp;The only problem is the grinding noise when scanning is very annoyed.<br />
does anybody experience this, and how much of the noise level<br />
can it be tolerated?<br />
Thanks for the answer.
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I had a brand new 6300cxi scanner, working very nice.  The only problem is the grinding noise when scanning is very annoyed.
does anybody experience this, and how much of the noise level
can it be tolerated?
Thanks for the answer.

6300cxi grinding noise when scanning

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.