Check you are installing setup_sammich_sid.hex (and not any other .hex file).
Check the resistor networks are oriented correctly, the dot on the resistor network must match the dot on the PCB.
You could have a short between the pins connected to the rotary encoder and pins connected to switches, but this seems unlikely, as they aren’t close together.
Tell me what you see on the screen as it boots up (what screen is showing after the “MIOS” screen).
Button “F2” should jump to the Knobs page, but it should then show K#1 to K#5.
Confirm that “F2” jumps to the Knobs page and the first parameter is “K#2” not “K#1”.
If that is true, I don’t know how it gets scrolled one parameter.
Perhaps if F2 switch and an encoder pin are shorted, then maybe that’s what is happening… turning encoder jumps to Knobs page, and then handles the scroll of that page.
The 5 select buttons and 3 function buttons are handled by the 74HC165 on the left. The other 74HC165 handles the other four buttons on the right, and the rotary encoder.
All I can suggest right now is check that there are no shorts between the pins connected to switches and the rotary encoder.
Is the 5th item (i.e. K#5 or K#V) value blinking while you are changing it with the encoder?
Probably not. If it was blinking, then that item would be selected and turning the encoder should change that parameter.
However, I suspect that somehow the code is interpreting the encoder as the 5th encoder in a full control surface, with the “Knobs” layer active.
i.e. If you have a full control surface with the “Knobs” layer active, and turn the knob labeled “Release”/“Pulse Width”/“Knob #5”, then it should jump to the Knobs page and change “K#5”.
DIN inputs 14 and 15 aren’t used. Well, technically the 14 one is connected to a pad under the encoder in case you use an encoder with switch, which you didn’t, so they both are unconnected to switches and thus you should never get inputs from them.
So…
Check RN4 is correctly oriented. Yes, again. You should be able to see the dot on the resistor network from that side.
Resolder the joints on RN4, and check there are no shorts between pins. Check RN4 pin 1 (next to dot) is connected to 5V. Resolder the IC pins connected to RN4.
Look at the PDF of the control surface PCB and check there is good continuity between the IC pins and RN4, where there are top layer tracks in red.
It’s possible (but unlikely) that the resistor network in RN4 is faulty, but I would try other things before replacing it. You could double-check the part number, just in case you got the wrong part (maybe it was put into a bag of the right part at the factory? I dunno, just guessing. I only buy and pack one kind of resistor network!)
You could try to connect those “faulty” pins of IC2 to a 5V pin, using a 10K (or anything between 1K and 10K) resistor. It’s safe to do this… you’re just replicating what the resistor network is doing. The pins in question are pin 5 and 6 of IC2, which are connected to pin 4 and 5 of RN4 (counting from the common pin with the dot marker). You can connect to 5V at C2. I’m not suggesting you do this as a permanent fix, but if you do it and the tester doesn’t show those “unused” events anymore, it confirms what is at fault, and you can then move to a more permanent fix, like replacing RN4 perhaps.
