The PA and DA both need human intervention to use at this point. The PA needs the LNA and PA turned on via button, and the DA needs to be activated by external 3.3V signal.
This is the hard one.
The frontpanel of interest
PCB frontside
I’ll be using the convention of the square pin (top left) being pin 1, and then zigzagging down then right. So pin 2 is bottom left, and pin 10 is bottom right.
The PCB appears to be a two layer board, so all signals are fully traceable. The two ICs are the Nexperia 74HC595D, an 8-bit shift register.
mini components identified using https://www.s-manuals.com/smd
Q2 marking: 2A - Likely a PNP (https://www.diodes.com/assets/Datasheets/MMBT3906.pdf)
Q1 marking: 1AM - Likely a NPN (https://www.diodes.com/assets/Datasheets/MMBT3904.pdf)
Diode marking: A4W 04 - dual diode, pin 3 is common cathode (https://www.vishay.com/docs/85546/bav70.pdf)
| Pin 1 | VCC | N/C |
|---|---|---|
| Pin 2 | VCC | N/C |
| Pin 3 | GND | BLACK |
| Pin 4 | GND | N/C |
| Pin 5 | Matrix A | GREEN |
| Pin 6 | Matrix B | BLUE |
| Pin 7 | OE_n | BROWN |
| Pin 8 | STG_CLK | ORANGE |
| Pin 9 | DIN | RED |
| Pin 10 | CLK | YELLOW |
After a lot of beep testing, here’s what the PCB looks like:
The LEDs are bi-color, which means is you bias them one way, they are red and if you bias them the other way, they are green. This is done by the complementary pair, which ensures that they are either connected to GND OR VCC. The logic to determine if they’re on or not is as follows:
| RD_EN | Pin | State |
|---|---|---|
| 1 | 0 | RED |
| 1 | 1 | OFF |
| 0 | 0 | OFF |
| 0 | 1 | GREEN |
In other words, on if (RD_EN XOR PIN) and the color is based on RD_EN.