Here’s some additional parts you may require.  The roller assembly should be replaced when the scan counter has reached the 100,000 page mark.  Aside from this, the main roller also tends to break on both the DS-510 and DS-560.  When this happens, the scanner will fail to feed even a single page and will make a clicking noise.

Epson Feed Roller Assembly Kit, 100000 Yield (B12B813561)
List Price: $49.99
Price: $47.07
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Epson B12B867201 Power Adapter, External, Black
List Price: $24.99
Price: $24.99
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