Star Wars: Knights of the Old Republic/HK-47

HK-47 can join your party if you purchase him from Yuka Laka, the Ithorian proprietor of the droid shop in Anchorhead on Tatooine. You can then speak to him at any time when he is added to your party or you're aboard the Ebon Hawk, where you'll find him in the with Canderous.

Dialog
Otherwise, you can tell him you'd like to know more about his functionality:


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You can also tell him that he doesn't need to call you master:

Meatbags
Otherwise:

Otherwise:

Otherwise:

Otherwise:


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Master
Otherwise:


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Purchase

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Otherwise:

Otherwise:

Otherwise:


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Memory
Otherwise:

Otherwise:


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Repairs

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Restoring other parts of the core requires an increasingly high rank of your main character for each of four consecutive repairs. Aside from unlocking further dialogs, HK-47 receives bonuses after each successful repair:

If HK-47 joins your party before you've acquired a fourth Star Map, these repairs are no longer possible once you've left that world and subsequently been captured by the ../Leviathan/, after which this quest will be completed (so these repairs aren't actually necessary). To achieve minimum Repair rank 17 to complete all four repairs, it's advisable to buy (Skills: Repair +3) and boost  using Master Valor (Intelligence: +5 from character level 15) and the  implant (Intelligence: +1, if possible).

If HK-47 doesn't join your party until after you've escaped the Leviathan, these repairs are still possible but you cannot technically complete this quest. If you have access to the ../Yavin Station/, then after acquiring the fifth and final Star Map you can also buy the (Skills: Repair +7) there. This may be a preferred option if your starting class is not a and your Jedi class is not a  (otherwise Repair is a cross-class skill), particularly for a dark side character who wants to add HK-47 to the party on the ../Star Forge/.

First
His response depends on whether this is one of the first two repairs, or the last two:

Insufficient Repair rank results in failure:


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The first repair requires minimum rank 8 to be a success:


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Second
The second repair requires minimum rank 11 to be a success:


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Third
The third repair requires minimum rank 14 to be a success:


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Fourth
The fourth repair requires minimum rank 17 to be a success:


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Leviathan
If you try restoring some of his memory a fifth time before acquiring a fourth Star Map, leaving that world and subsequently being captured by the ../Leviathan/:

The 'proper stimulus' is discovering who originally sent him on that assassination mission in Mandalorian space, as you escape from the Leviathan...