RetroRosetta with LevelShifter Case Guide - GrechTech/RetroRosetta GitHub Wiki
RetroRosetta + LevelShifter Assembly
NOTE: Please be careful with the case shell before fitting, and avoid flexing any parts, including the button tabs, until after the case is fitted to the shell.
Parts

[1] 4 x 25 mm hex white plastic spacers (M2.5 - Threaded)
[2] 4 x 2 mm white plastic spacers (M2.5 - Unthreaded)
[3] 4 x 15 mm black plastic spacers (M2.5 - Unthreaded)
[4] 2 x Case sheet
[5] 4 x 60 mm bolts (M2.5)
[6] Optional Grouping header
[7] Wires (Female-Female Dupont 2.54mm header jumper wires)
[8] 4 x hex nuts (M2.5)
[9] RetroRosetta PCB
[10] LevelShifter PCB
[11] 1x LevelShifter case
[12] 1x RetroRosetta case
Recommended tools
PH00 screwdriver
[Optional] M2.5 hex wrench/spanner OR small mole grips
Instructions
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Place 4x 60mm bolts [5] on to the table
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Place a case sheet [4] on the 4 bolts [5] with textured side facing the heads of the bolts

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Add a white 2mm spacer [2] onto each bolt [5]

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Add the LevelShifter PCB [10] onto the 4 bolts [5] with atop the spacers [2] and bottom sheet [4], with the male pins facing upwards

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Connect the controller cables for your system to the LevelShifter - But don't connect the wires [7] to the RetroRosetta board yet with the appropriate guide
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Add the LevelShifter case [11], routing the wires [7] through the centre opening

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Add the 15mm black spacer [3] onto each bolt [5]

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Place the RetroRosetta case [12] onto the bolts [5]

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Connect the wires [7] from the LevelShifter PCB [10] to the RetroRosetta PCB [9] by continuing the appropriate guide
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Slide the RetroRosetta PCB [9] onto the bolts, with the male pins again facing upwards, routing the cables and wires [7] through the gaps besides and behind the board

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[Optional] Add 1 or 2mm spacers onto each bolt
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Add the 25mm white plastic spacer [1] onto each bolt and tighten fully
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Route the external cables through the Player 1 and Player 2 holes in the RetroRosetta case
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Add the 2nd case [4] sheet on top with the matte side facing up
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Add a nut [8] onto each bolt [5] and tighten