How to open the top cover of Xiaomi Air Purifier 2

Open the back cover to remove the cartridge. There is a flexible tray at the bottom that presses the cartridge tightly against the fan on top. Here's how to start removing it, starting from the bottomThe power parameters are written on the bottom. Use a screwdriver to pry off the four feet to expose the screws. Unscrew the screws and open the back cover. The power supply is at the bottom. This purifier is DC powered. Side look at the power supply, with black solder resist, the solder joints are very uniform, the circuit board is very clean. It looks very high-grade. Unscrew the screws, the power supply can be pulled out. This is the DC output connector. The front of the power supply. The DC output is filtered by three electrolytic capacitors and has a coil to reduce the ripple voltage. On the AC input, there is a complete EMI filter circuit. Continuing with the disassembly, the chassis compresses the cartridge through 4 springs. It can be taken right out. The left and right side panels are fastened by snaps