There are gonna be times when you need to replace the sep pad and p/u roller. For a lasting repair when its either multi-feeding or not feeding replace them both. It keeps those recalls down.I have done it countless times for faxes and printers but am not familiar with the hp 3/3100. The hp inkjet needs to have the feeding cams disassy then r/r rollers then retime cams. But because of the amount of labor we would buy the base feeder instead, just costing slightly more for the cust. Wish I could help. If this is a home project you might have all the time you'll need.
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