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[[File:build51_join_parts_control_04.jpg|600px|right]]
[[File:build51_join_parts_control_04.jpg|600px|right]]
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'''2.''' Using two fingers, one on each hand, softly pull the main board's control-1 connector tongue until it's open. Insert the flat ribbon cable coming from the control board (top part). Do it straight, without bending or twisting it in any way, so '''the contacts side is faced up'''.
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'''2.''' Using two fingers, one on each hand, softly pull the main board's control-1 connector tongue until it's open. Insert the flat ribbon cable coming from the control board (top part). Do it straight, without bending or twisting it in any way, so '''the metal contacts side is facing up'''.
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