found at [[Dollar Tree]] JR-23键琴-A (JR-23Keyboard-A) 2025.02.24-ZYC V2.0 ## Circuitboard ### Image ![[IMG_0840.jpeg]] ### IC Seems to be custom/proprietary, but the pins are exposed. JFL16-2 JY503013 ### Other Components - 104P for power regulation - 101 for LED ## Pinout16 | Pin | Use | K1 (1,10) | K2 (2,10) | K3 (3,10) | K4 (4,10) | K5 (15,10) | K6 (16,10) | K7 (1,9) | K8 (2,9) | K9 (3,9) | K10 (4,9) | K11 () | K12 | K13 (1,8) | K14 (2,8) | K15 (3,8) | K16 (4,8) | K17 | K18 (16,8) | K19 | K20 | K21 | K22 | K23 (15,7) | K24 “Mode” (16,7) | | --- | ------------------- | --------- | --------- | --------- | --------- | ---------- | ---------- | -------- | -------- | -------- | --------- | ------ | --- | --------- | --------- | --------- | --------- | --- | ---------- | --- | --- | --- | --- | ---------- | ----------------- | | 1 | Keyboard | 1 | | | | | | 1 | | | | | | 1 | | | | | | 1? | | | | | | | 2 | Keyboard | | 2 | | | | | | 2 | | | | | | 2 | | | | | | 2? | | | | | | 3 | Keyboard | | | 3 | | | | | | 3 | | | | | | 3 | | | | | | 3? | | | | | 4 | Keyboard | | | | 4 | | | | | | 4 | | | | | | 4 | | | | | | 4? | | | | 5 | LED+ (through 100R) | | | | | | | | | | | | | | | | | | | | | | | | | | 6 | RESET | | | | | | | | | | | | | | | | | | | | | | | | | | 7 | GND | | | | | | | | | | | | | | | | | | | 7 | 7 | 7 | 7 | 7 | 7 | | 8 | GND | | | | | | | | | | | | | 8 | 8 | 8 | 8 | 8 | 8 | | | | | | | | 9 | GND | | | | | | | 9 | 9 | 9 | 9 | 9 | 9 | | | | | | | | | | | | | | 10 | GND, VSS | 10 | 10 | 10 | 10 | 10 | 10 | | | | | | | | | | | | | | | | | | | | 11 | LED- | | | | | | | | | | | | | | | | | | | | | | | | | | 12 | SPK | | | | | | | | | | | | | | | | | | | | | | | | | | 13 | VCC (+3.1V, AAx2) | | | | | | | | | | | | | | | | | | | | | | | | | | 14 | SPK | | | | | | | | | | | | | | | | | | | | | | | | | | 15 | Keyboard | | | | | 15 | | | | | | | | | | | | 15? | | | | | | 15 | | | 16 | Keyboard | | | | | | 16 | | | | | | | | | | | | 16 | | | | | | 16 |