AJAZZ AK33 mechanical keyboard

Cheap mechanical keyboard from 2019. I believe there are few different different keyboard models sharing same name - this one is probably one of the earliest and cheapest variant, with mini-USB socket, without backlight and with soldered (not hot-swappable) key switches.

This keyboard is inlucded in https://github.com/SonixQMK/Mechanical-Keyboard-Database.

Initial state: not detected by USB host, not drawing any current from USB, damaged Esc key switch.

AJAZZ AK33 keyboard

AJAZZ AK33 keyboard

Single layer PCB with 0 Ohm resistors used as jumpers.
LEDs and related jumper resistors are unpopulated.
AJAZZ AK33 keyboard

VS11K18A 8-bit microcontroller made by company called Vision. 4k x 16 bit FLASH, 160 x 8 bit RAM, 8 levels stack buffer. Internal 6 MHz clock, most of instructions are single cycle. Features USB low-speed device and internal 3.3 V regulator.
AJAZZ AK33 keyboard

For a moment I thought that this was problem with MCU soldering, but pins 37...40 are actually internally not connected and intentionally not soldered - this helped with routing as there are other traces under these pins and silkscreen.
AJAZZ AK33 keyboard

The real problem: bent +5V pin inside mini-USB socket. Keyboard was working after replacing this socket.
AJAZZ AK33 keyboard

AJAZZ branded Cherry MX blue (clicky) clone switches.
AJAZZ AK33 keyboard

AJAZZ AK33 keyboard

Unpopulated transistors driving LEDs.
AJAZZ AK33 keyboard

PCB markings: KM107-18A-VS.
AJAZZ AK33 keyboard

While "wide" keys have switches with different color, I wasn't able to feel any difference between them.
AJAZZ AK33 keyboard

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