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Multimeter – to verify continuity of connections and check for shorts Let’s Get Started – Start by removing the top cover from the 7800 by removing the 5 screws along the bottom of the case. Two in the rear section, three in the front. (Set top case aside)
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2. Remove the upper RF shield by using your needle nose pliers to twist the hold down metal tabs and make them stand straight up and flat so they will fit through the slots they originally come up from. 3. Locate the area where wires will be attached on the resistor ladder section just to the right and below the RF modulator area.
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6. Solder your wires onto the MK AV board first to make it easier. Solder your wires that will go to the resistor section along with your +5 and Gnd as marked on the MK AV board: 7. Solder your wires from the MK AV Video out section that will be connected to your AV out connections: (Chroma &...
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Trim your wires as needed for proper length. Now prepare the 7800 case and drill the needed holes for your AV jack connections. Most panel mount jacks require a ¼” hole for RCA and usually a ½” or 9/16” hole for S-Video. Be careful when drilling holes into plastic of this age as it will crack easily.
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NOTE 1: The MK AV board does not have ground attachment points on it. So all ground connections to the AV connectors will need to be made to any ground point on the 7800 main board. Again, the main GND rail in the center provides several unused vias perfect for this.
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