Here is the User guide for the HP PhotoSmart D7100
Still looking for any Technician Manuals.
Keep in mind some parts do NOT get manuals, as they come from factory with parts.
These parts are NOT considered WORKABLE, but instead REPLACEABLE.
FRU's (Field Replaceable Units) as the acronym is used, refers to components that do NOT get fixed, but instead get replaced.
So there is NO NEED to know how to fix it......or take it apart, or what parts comprise the componenet, as it is not needed. The component gets replaced if determined faulty. So, if the component you speak of falls into this category, then your best luck will be to replace the whole component. Maybe a bottom assembly, or a drawer assempbly housing.
While i am trying to track down a technician manual (i used to work for IT supplier) it is possible that the very small pieces such as springs, levers, rollers, bearings, holders, slots, etc etc will NOT be shown.
But I will show you everythign that is available for that printer.