SmartLoad Drum Closing/Opening
Howdy, Greg. I don't know (yet!) exactly how the lint scraper works. I can say that there are two openings at either side at the top of the lint receptacle's bay. The heating elements are at the right side of the drum -- like at the back of a GE. Airflow, I assume, is from right to left, out through the grille at the left side. The grille itself and the lint receptacle are stationary. There's a scraper arm or mechanism of some ilk that wipes the lint off when it reaches 1/8" accumulation (I read that specific figure somewhere) and I'm guessing it simply drops into the collector.
The drum is belt-driven. The belt is wrapped around the extreme right side. The motor is reversible, of course, and variable speed. Reverse tumble may be a touch slower than forward tumble, but the speed otherwise does not appear to vary *during* tumbling. The motor does rev-up slowly when the drum gets started in either direction, it doesn't fire-up instantly to full speed. It also runs at a slower speed when indexing the drum for the unlocking procedure.
By way of a minor disassembly

I offer the two video clips below.
The drum lid is opened or closed by way of a latching mechanism that spams the full width of the drum, operated by a separate electric motor. The mechanism is largely concealed behind the top-deck / loading port, but there is a small finger latch at the front left of the loading port for use in opening the drum during a power failure. Power is required to rotate the drum for opening, which of course cannot occur during a power failure. The outer lid requires power to lock, so automatically unlocks during a power failure. The user can hold down the finger latch and manually rotate the drum forward to engage the lid latching mechanism in order to remove clothes during a power failure. There are a couple stickers on the outer surface of the drum to remind of how to do this.
Drum-Close.avi (1.75 MB)
Drum-Open.avi (1.46 MB)