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Make sure that you have both of the necessary new parts, and that they are undamaged:
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White plastic Jumper Board Spacer.
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Jumper Board marked with part number TD-TDMY-A and assembled with three 1x3 male pin headers.
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The Jumper Board pictured here is green, but yours may be a different color.
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Check to make sure that none of the Jumper Board pins are bent. If any of them are slightly bent, attempt to bend them back into position with a small pair of pliers. If any of them are damaged, please contact us for a replacement.
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Place the TinyNES on a flat work surface. Make sure that no cables, controllers, or cartridges are connected to it.
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Remove the 8 marked M2.5 x 10 mm flat head machine screws.
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Put the screws aside, being careful not to lose them.
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Lift the top panel off of the enclosure and put it aside.
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If the white plastic cartridge guide comes off with the top panel, remove it from the top panel and reposition it around the cartridge connector.
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Locate the 3 marked 1x3 female sockets on the main board. These components are designated H2, H3, and H4.
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Two different photos are shown here from varying angles in order to help you identify these 3 sockets.
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Place the jumper board so that its pin headers align with all 3 of the sockets. Then push down to seat the jumper board fully into all 3 sockets.
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The jumper board is not symmetrical and it will only mate with all 3 of the sockets in one orientation, as shown.
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The white printed markings on the jumper board should be facing down and should not be visible after the board has been installed.
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Verify that the jumper board has been seated correctly and is secure.
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