Recommended board: Kit (or let me know if you want the Kit pre-assembled for the Jr.)

Instructions are for the NTSC 3-chip version. I don't have access to a unicorn/1-chip or PAL version. Please contact me if you're willing to help expand these instructions. If the C101688 unicorn chip is the same as Warner's 'Jan' chip, then it isn't compatible with UAV.

This is one of the more difficult installs. There just isn't much room in the 2600jr and removing the 4050 isn't an option as it's used by the reset circuit. Soldering and desoldering are required. The Jr's case seems to be very brittle so use caution when taking the screws out so the internal posts don't snap off. Lift the left side of the top case first so you can unplug the flex cable going to the switches. The board is held in by snap levers on the left and right edge. Again, be careful not to break these. Once the board is out, you can straighten the tabs on the bottom of the shield and remove it.

My Jr. didn't have anything holding the regulator down which means it isn't making use of the large cooling pad on the PCB. I'd advise soldering the tab down or putting a screw through the board.

To install the UAV, you're going to need to remove the 4050 or run wires to it and mount it outside the shield (which can be done with a Basic Board). These instructions deal with installing it under the shield.

1. Using the components in the Kit, install the configuration jumpers and the round socket pins. Do not install the green terminal.
2. Desolder the 4050. This can most easily done by clipping the legs off and then clearing the pad holes individually. Hold on to the 4050 as we'll be using it later (Fig. 1, 2).
3. The internal shielding is required for a good RF picture. If you don't plan on using the RF output, you can omit the shielding and install the UAV in a socket as shown in Fig. 3. Otherwise, solder the UAV directly into the board as shown in Fig. 4.
4. Install the 4050 on the bottom of the board (Fig. 5). This part is tricky. Trim the leads flush with the bottom of the IC and place in the middle of the UAV pins. The 4050 must be upside down, and pin 1 must be oriented toward the middle of the PCB. It may be necessary to bend the UAV pins slightly outwards. Solder each pin carefully and make sure nothing will contact the bottom shield (if used).
5. Lift the back leg of R54 and solder the Color pick-up wire to the exposed pad. Solder the other end to the Color In pad on the UAV (Fig. 6).
6. If the RF jack isn't going to be used, it can be re-purposed as a Composite or Audio jack. To do this, lift the right side of R19 and solder the desired signal to the exposed pad (Fig. 6).
7. Set the jumpers as shown in Figure 6.
8. Install desired AV jacks and connect the wires to the appropriate output pads on the UAV (Composite, Chroma, Luma, Ground).

Installing an Audio Companion board:

1. Locate C12 and solder the Audio Companion board across its leads with ground (G) toward the back (Fig. 7).
2. Solder a wire from input iA (the first one toward the front) to the front pad of R34 (I used the connected via just in front of it in Figure 8 ).
3. Connect the audio out wire to the last pad on the Audio Companion marked out. If you wish to use the RF jack for audio, see step 6 above.
4. Connect audio ground to the ground pad on the Audio Companion, or any nearby ground point on the PCB. This isn't needed if you use the RF jack.

Carefully check your work against the pictures before powering the system. Route cables carefully out of the shielding during reassembly.