Inside the SK621
As we start to look into opening up the SK621, we see that screws are accessed through the top panel. To do that, keycaps need to be removed, so we showed them first. We have single shot caps, made in white plastic, which are then painted black. The stems are typical to most mechanical keycaps, but we do see torsion bars in the larger keys, they are not built into the switches.
Speaking of the switches, we can see immediately that they are clear bodied Cherry branded switches with red linear plungers. Each switch has its own RGB LED on the inside of the switch, and near the top, you can see the pair of torsion bar supports for the Return key and is present in all of the larger keys.
Once all of the screws are removed, the keyboard will open right up. The first point we want to make is that there are two batteries which we assume are Li-Ion packs, and are said to last three to four months with no LEDs in use, and up to fifteen hours with full RGB lighting active. The second point is that the cable that goes from the cable connection to the PCB is made to be detachable, but isn't. Unscrewing the jack from the bottom doesn't allow it to lift out, and a solder point is holding in the removable connection on the PCB end. If you plan to open up this keyboard, be careful.
Since we mentioned the PCB, we may as well take a look at a random location on it. We do see some residue from the soldering process, but much of it has been cleaned up from the black PCB. We also like the accuracy and cleanliness of the solder points as well; both showing how good the quality control at the factory is.
Before we close up shop and power on the keyboard, we had to stop and look at the workhorse of the SK621, the Holtek processor. In this instance, the 32-bit ARM Cortex-M0 is this HT50F52 model, with plenty of grunt and onboard memory to keep you busy programming it, and the best part is all of that time and energy of programming travels with the keyboard, not so much system dependent as others.
With a full multitude of options for RGB LED lighting, both built into the keyboards secondary functionality, as well as in the Portal software, we chose the Rainbow Cyclone mode. It shows the most colors at once, as a rotation of rainbow colors centers on the H-key, and by default spins counter-clockwise.