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Assembly Procedure for newer PCBs with OLED display

The HBG3 has evolved a bit since the original assembly pictorial. So here is a re-spin, showing assembly of one with OLED and button. No GPS shown here yet, because I don't have one to add to this unit. Will update later.
Full parts kit, including OLED. The kit also includes a short AUX cable (not shown).
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Form a temporary sandwich of the ESP32 and HBG3 PCBs, but do NOT solder anything yet!
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Use needle-nose pliers to remove all of the unnecessary pins, those without a white circle around them on the HBG3 PCB.
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Use pliers to push the pins flush on the ESP32 side. This gets rid of any need to trim them short at the end, so that they don't puncture the heat-shrink wrapper.
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Still keeping the sandwich tight together, trim the excess of each pin flush to the HBG3 PCB, except for the one (GND) pin needed for the WiFi mode switch!
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Here it is all trimmed, with the one (GND) pin for the WiFi mode switch still in place (leave it!).
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HBG3 side of the sandwich, showing which pins remain (with white circles), and which have been removed. Note again, the un-trimmed GND pin needed later for the WiFi mode switch.
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After disassembling the sandwich now, this is what the two headers will look like.
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Begin the soldering, by positioning the 3-pin buck converter (green) and trimming its pins flush to the underside of the HBG3 PCB.
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Solder the three buck pins, and trim them flush if not already done earlier. Now snap the Nunchuck socket into place. If the plan is to later attach a GPS to this side of the HBG3, then now is the time to trim the Nunchuck's six pins and four tabs flush to the HBG3 PCB before soldering.
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Solder the six pins and four tabs of the Nunchuck socket.
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Attach and solder the 6-pin RJ12 connector, giving this partially assembled unit.
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Time for the MUSB switch now. Take a 2-pin header (left), and push the pins through to give the result shown on the right.
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This is where it goes. Solder it in place, nice and straight. Tricky!
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Trim the protruding pin from the underside, and bend the other pin as shown here, to line up with the switch.
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Solder it. I do the bent pin first, while holding the switch with one finger. Then solder a blob onto the other two pins. Finally, touch up the bent pin if needed.
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Next is the extra-long header for the OLED. Position it as shown, splayed outward from the side of the HBG3 PCB.
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Solder it in place. It should end up looking like this.
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